2016
Electric Service
Rules
 GENERAL INFORMATION
 TEMPORARY SERVICES
 OVERHEAD SERVICES
 UNDERGROUND SERVICES
 DISTRIBUTED GENERATION
 METERING
H
UD MANUFACTURED
HOMES
 FARM SERVICES
 UTILITY/CATV SERVICES
 PRIMARY SERVICES
S
PECIAL SERVICES
AND MOTORS
O
PTIONAL STANDBY
GENERATION
 CLEARANCES
 GROUNDING AND BONDING
© 2015 Alliant Energy 885246 12/15 JS
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ELECTRIC SERVICE RULES
Issued Jan 2016
Call
Before
You
Dig
ALLIANT ENERGY IP&L/WP&L TELEPHONE NUMBERS
Electric Service: 1-800-862-6222 or 1-800-ALLIANT
Outage Reporting: 1-877-740-5050 or 1-800-ALLIANT
PRE-EXCAVATION TELEPHONE NUMBERS
Pre-Excavation Call Number All Areas - 811
Iowa – Iowa One Call: 1-800-292-8989
Wisconsin – Diggers Hotline: 1-800-242-8511
ALLIANT ENERGY WEBSITE
Key in Web Site
www.alliantenergy.com/servicemanuals
Call
Before
Pagei
You
Dig
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ELECTRIC SERVICE RULES
Issued Jan 2016
TABLE OF CONTENTS - ESR Revision Date: January 2016
DIGGERS HOTLINE
Telephone Numbers, Alliant Energy Web Site Information & Cable Locating Services
CHAPTER 1 – GENERAL INFORMATION
Page
100.
General......................................................................................................................... 1
101.
Purpose ........................................................................................................................ 1
102.
Scope ........................................................................................................................... 1
103.
Word Application .......................................................................................................... 2
104.
Continuity of Service .................................................................................................... 2
105.
Point of Service ............................................................................................................ 2
106.
Codes and Rules .......................................................................................................... 2
107.
Application for Service .................................................................................................. 3
108.
Service Voltages and Maximum Amperage ................................................................. 5
109.
Number of Services ...................................................................................................... 6
110.
Short Circuit Duty Requirements ................................................................................ 10
111.
Inspections and Maintenance ..................................................................................... 12
112.
Service Connections .................................................................................................. 12
113.
Identification of Conductors ........................................................................................ 12
114.
Capacity ..................................................................................................................... 12
115.
Changes to Customer’s Existing Service-Entrance Equipment ................................. 13
116.
Alliant Energy Equipment on Customer Premises ..................................................... 13
117.
Sequence of Disconnecting Service and Meter ......................................................... 14
118.
Customer Installation.................................................................................................. 14
119.
Communication Tower Installation ............................................................................. 15
CHAPTER 2 - TEMPORARY SERVICE
200.
General....................................................................................................................... 17
201.
Overhead Temporary Service, 1PH, 3-Wire, 120/240V, 200A Max ........................... 18
202.
Underground Temp./Perm. Service, 1PH, 3-Wire, 120/240V, 200A Max................... 20
203.
Underground Temporary Service, 1PH, 3-Wire, 120/240V, 200A Max ...................... 22
204.
Underground Temporary Service, 1PH, 3-Wire, 120/240V, 200A Max ...................... 24
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ELECTRIC SERVICE RULES
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CHAPTER 3 – OVERHEAD SECONDARY SERVICE
Page
300.
Scope ......................................................................................................................... 27
301.
Attachment of Service Drops ...................................................................................... 28
302.
Service Mast Construction ......................................................................................... 28
303.
Service Mast Installation for Flat or Low Roofed Buildings ........................................ 30
304.
Service Attachment to Brick or Masonry Walls and Metal Buildings .......................... 31
305.
Service Riser Requirements ....................................................................................... 32
306.
Wall or Through-The-Roof Installation ....................................................................... 33
307.
Pole Mounted Service Entrance - Optional Construction, No Building Available ....... 34
CHAPTER 4 – UNDERGROUND SECONDARY SERVICE
400.
Scope ......................................................................................................................... 35
401.
General Information .................................................................................................... 35
402.
Sizing Underground Facilities ..................................................................................... 36
403.
Location of Alliant Energy Secondary Voltage Cables ............................................... 36
404.
Underground Service Installations ............................................................................. 37
405.
Outdoor Meter Socket, Single-Phase & Three-Phase ................................................ 39
406.
Wall Mounted Pedestal Service, Single or Duplex, Single-Phase & Three-Phase..... 40
407.
Free Standing Pedestal Service Entrance, Single-Phase & Three-Phase ................. 41
408.
Rigid Conduit .............................................................................................................. 42
409.
Concrete Pad Specifications for Three-Phase, Pad-Mount Transformers ................. 44
410.
Concrete Pad Layout for Three-Phase, Pad-Mount Transformers ............................. 45
411.
Transformer Concrete Pad - Foundation Wall ............................................................ 46
412.
Box Pad Specification for Single-Phase, Pad-Mount Transformers ........................... 48
413.
Box Pad Specification for Three-Phase, Pad-Mount Transformers............................ 49
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CHAPTER 5 – DISTRIBUTED GENERATION - INVERTER BASED
Page
500.
Scope ......................................................................................................................... 51
501.
Availability .................................................................................................................. 51
502.
Permission to Connect ............................................................................................... 51
503.
Electric Rate ............................................................................................................... 51
504.
Metering ..................................................................................................................... 51
505.
Company Distribution System .................................................................................... 51
506.
Technical Information ................................................................................................. 52
507.
Contract ...................................................................................................................... 52
508.
Insurance.................................................................................................................... 52
509.
Generator Operation .................................................................................................. 52
510.
Generator Maintenance .............................................................................................. 52
511.
Generator Protection .................................................................................................. 52
512.
Isolation ...................................................................................................................... 52
513.
Synchronizing ............................................................................................................. 52
514.
Transformation ........................................................................................................... 52
515.
Power Factor and Capacitors ..................................................................................... 53
516.
Optional Standby Generator Used with Parallel Generation ...................................... 53
517.
Additional Requirements ............................................................................................ 53
518.
Drawings .................................................................................................................... 53
519.
Net-Metered Self-Contained Distributed Generation .................................................. 54
520.
Net-Metered Distributed Generation Field Built Structure .......................................... 58
521.
Dual Metered Farm Yard-Pole Distributed Generation .............................................. 60
522.
Net-Metered Farm Yard-Pole Distributed Generation ................................................ 62
523.
General Service Instrument Metered Distributed Generation..................................... 64
524.
General Service Instrument Metered Distributed Generation..................................... 68
525.
Duplex Manufactured Pedestal Distributed Generation ............................................. 70
526.
Dual Instrument Transformer Distributed Generation Optional .................................. 72
527.
Primary Metered, Pad-mount Switchgear, Distributed Generation ............................ 74
528.
DG, Net Metering for Remote Building w/Load Feeder Panel .................................... 75
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ELECTRIC SERVICE RULES
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CHAPTER 6 – METERING
Page
600.
Metering Facilities ...................................................................................................... 77
601.
Location of Meters ...................................................................................................... 77
602.
Metering Installations ................................................................................................. 80
603.
Identification of Meters ............................................................................................... 81
604.
Meter Seals ................................................................................................................ 81
605.
Clearance Requirements for Metering Equipment ..................................................... 82
606.
Separation of Metered and Un-Metered Conductors ................................................. 82
607.
Meter Socket Requirements ....................................................................................... 83
608.
Meter Socket Types ................................................................................................... 84
609.
OH & UG Self-Contained, 277/480 Volt, Three-Phase, 200A Max ............................ 86
610.
Self-Contained Multiple Metering Group & Modular, 200A Max ................................. 88
611.
Self-Contained Multiple Metering Group & Modular, 200A Max ................................. 92
612.
Meter Shield ............................................................................................................... 93
613.
Outdoor Free-Standing (Field-Built) Meter Structures ................................................ 94
614.
Instrument Transformer Installations .......................................................................... 96
615.
Wall-Mounted Outdoor Metering Transformer Cabinet - OH Service ......................... 99
616.
Wall-Mounted Outdoor Metering Transformer Cabinet - UG Service ....................... 100
617.
Pad-Mounted Outdoor Metering Transformer Cabinet - UG Service ....................... 102
618.
Modular Metering with Approved and Customer Termination Cabinet ..................... 104
619.
Combined Instrument Transformer, Self-Contained Multiple Metering .................... 105
CHAPTER 7 – HUD MANUFACTURED HOMES
700.
Scope ....................................................................................................................... 111
701.
General Requirements ............................................................................................. 111
702.
Definitions ................................................................................................................. 112
703.
Mobile/Manufactured Home Courts .......................................................................... 114
704.
Service Entrance Pedestal for Manufactured Homes, Underground ....................... 115
705.
Field Built Service Entrance for Manufactured Homes, Overhead ........................... 116
706.
Field Built Service Entrance for Manufactured Homes, Underground ...................... 118
707.
Manufactured Home Service Pedestal, Mounted on Frost Wall ............................... 120
708.
Manufactured Home Service Pedestal, Mounted on Full Basement ........................ 121
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ELECTRIC SERVICE RULES
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CHAPTER 8 – FARM SERVICE
Page
800.
Scope ....................................................................................................................... 123
801.
Non-Farm Services .................................................................................................. 123
802.
Farm Service Yard Pole or Structure ....................................................................... 123
803.
Overhead Serv. to Farm Yard Pole w/Disconnect and Overcurrent Protection........ 126
804.
Overhead Serv. to Field Built Structure w/Disconnect and Overcurrent Protection . 128
805.
Overhead Serv. to Farm Yard Pole w/Pole Top Transfer Switch ............................. 132
806.
Underground Serv. to Farm from Overhead Transformer on Field Built Structure ... 134
807.
Underground Serv. to Farm on Field Built Structure w/Overcurrent Protection........ 136
808.
Underground Serv. to Farm from Pad-mount Transf. w/Pad-mount CT Cabinet ..... 139
CHAPTER 9 – UTILITY/CATV
900.
General..................................................................................................................... 141
901.
Utility/CATV Pole-Mount Service, 120/240 Volt, Single-Phase, 200A Max .............. 142
902.
Utility/CATC Underground Service, 120/240 Volt, Single-Phase, 200A Max ........... 144
903.
Non-Metered Holiday Lighting (Where Permitted) ................................................... 146
CHAPTER 10 – PRIMARY SERVICES
1000. General..................................................................................................................... 147
1001. Overhead Primary Service ....................................................................................... 150
1002. Underground Primary Service .................................................................................. 154
1003. Underground Primary Service with Overhead Metering ........................................... 156
1004. Underground Primary Service to Metering Enclosure .............................................. 158
CHAPTER 11 – SPECIAL EQUIPMENT AND MOTORS
1100. Service Distorting Equipment ................................................................................... 161
1101. Phase Balance Equipment ....................................................................................... 161
1102. Power Factor Correction .......................................................................................... 161
1103. Arc Welders .............................................................................................................. 162
1104. Protection and Control .............................................................................................. 162
1105. Motor Specifications ................................................................................................. 162
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CHAPTER 12 – OPTIONAL STANDBY GENERATION
Page
1200. Scope ....................................................................................................................... 165
1201. General Information .................................................................................................. 165
1202. Safety ....................................................................................................................... 165
1203. Transfer System Requirements ................................................................................ 165
1204. Transfer Switch Options ........................................................................................... 166
1205. Transfer Switches ..................................................................................................... 166
1206. Connection and Neutral Switching Requirements .................................................... 167
1207. Standby Generator Installation, Single-Phase, 120/240 Volt, 300A Max ................. 170
CHAPTER 13 – CLEARANCES
1300. Scope ....................................................................................................................... 171
1301. Minimum Clearances for Services, 300 Volts and Below ......................................... 171
1302. Minimum Clearances for Services, 300 Volts and Below, Over Pools ..................... 173
1303. Minimum Clearances for Services Over State and Federal Highways ..................... 173
1304. Service Conductor Clearance From Signs ............................................................... 174
1305. Service Mast Installation - Roof Clearances, Clearance of Service Drop ................ 174
1306. Service Mast Installation - Roof Clearances, Clearance of Service Drop ................ 175
1307. Clearance Envelope for Grain Bins .......................................................................... 176
1308. Special Horizontal Clearances for Overhead Cable Services .................................. 177
1309. Pad-mount Transformer Locations ........................................................................... 178
1310. Barriers ..................................................................................................................... 182
1311. Fire Escapes ............................................................................................................ 182
1312. Single-Phase, Pad-mount Transformer Protection ................................................... 183
1313. Three-Phase, Pad-mount Transformer Protection ................................................... 184
CHAPTER 14 – GROUNDING AND INTERSYSTEM BONDING
1400.
1401.
1402.
1403.
1404.
Scope ....................................................................................................................... 185
General..................................................................................................................... 185
Grounding Electrode System ................................................................................... 185
Bonding Service Entrance and Metering Equipment ................................................ 189
Bonding Conductor Size........................................................................................... 190
Index
Supplement – Single-Phase and Three-Phase Handouts
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ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
ELECTRIC SERVICE RULES – GENERAL INFORMATION
CHAPTER 1
100. GENERAL
The use of the name Alliant Energy in this Electric Service Rules (ESR) Manual refers to the electric
utility operations in Iowa for Interstate Power and Light (IP&L) and in Wisconsin for Wisconsin
Power & Light (WP&L).
101. PURPOSE
A. The purpose of this Electric Service Rules Manual is to supply essential information to
customers, employees, architects, engineers, contractors, inspectors and others who are
concerned with the planning and construction of electric service installations in Alliant Energy’s
service areas.
B. Information in this Electric Service Rules Manual is intended to cover typical installations.
Alliant Energy shall be consulted for installations not covered by this manual.
C. Before and during the planning stages for electric service, especially larger projects, customers,
their contractors, architects and engineers shall call Alliant Energy at 1-800-ALLIANT (800-2554268). A representative will assist in the planning and scheduling and be available to explain all
applicable rates and rules.
D. All information provided in this Electric Service Rule Manual is used in conjunction with Alliant
Energy’s tariffs on file with the Iowa Utilities Board and the Wisconsin Public Service
Commission.
This edition of the Electric Service Rules supersedes all previous editions.
Informational Note: The purpose for the existence of the Electric Service Rules Manual is to convey Alliant Energy’s requirements that are in addition to the National Electric Code (NEC). For example, according to the NEC, an overhead service can be connected to the grounding electrode conductor at the weatherhead, in the meter socket or in the service entrance. Alliant Energy only allows the connection to be made in the service entrance. For context, many items that are not more restrictive are included in the text and diagrams. The reasons for being more restrictive are to increase safety, improve power quality and to control overall costs. 102. SCOPE
The scope of this Electric Service Rules Manual is to provide information to assist in the design and
construction of electric service installations. Information is provided to address the responsibilities
for ownership, installation and maintenance of equipment to accommodate installation of utility
owned overhead and underground service laterals and the installation of customer termination and
metering facilities.
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103. WORD APPLICATION
A. “Shall” denotes a rule or mandatory requirement which must be followed.
B. “Should” recommends a desirable practice for a specific condition.
C. “May” indicates a possible option.
104. CONTINUITY OF SERVICE
A. Alliant Energy’s goal is to provide continuous electric service of high-quality power at specified
voltage and frequency, restore service promptly and maintain its facilities with minimal
inconvenience to customers. However, Alliant Energy does not guarantee continuous service,
standard voltage or frequency at all times.
B. Customers who are operating equipment that is sensitive or requires a higher quality of service
may find it necessary to install, at their own expense, power-conditioning equipment to protect,
mitigate or otherwise provide the standard of service needed by their load.
105. POINT OF SERVICE
The energy supplied by Alliant Energy changes ownership at the point of service. This is the
location where the customer’s wiring starts and Alliant Energy’s ends. The overhead point of service
is where Alliant Energy attaches its service drop to the building or structure. In Wisconsin, Alliant
Energy provides the insulated attachment device, if requested, at the customer’s building or
structure. In Iowa, the customer provides and installs the insulated attachment device. The
underground point of service is either at the metering point, self-contained meter or Current
Transformer (CT) cabinet or the termination box.
106. CODES AND RULES
Alliant Energy requires that all customer wiring installations meet the minimum requirements of the
National Electrical Code (NEC), National Electrical Safety Code (NESC), National Fuel and Gas Code
(NFPA 54), Liquefied Petroleum Gas Code (NFPA 58), DOT Regulations and/or state and local codes
when their requirements are more restrictive.
A. COMPLIANCE: Alliant Energy reserves the right to refuse to extend service where a
customer’s installation does not comply with these provisions and requirements as stated. In
case of service refusal, Alliant Energy shall inform the customer of the reason for refusal to
render service within one business day.
B. Alliant Energy shall de-energize any service when that service is in an unsafe condition.
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107. APPLICATION FOR SERVICE
Applications for a new service and /or changes to an existing service shall be made in writing and
made in advance of the date service is required. This will permit Alliant Energy to plan and schedule
work to provide service by the date required. Please call 1-800-ALLIANT (800-255-4268).
A. Application forms:
The proper application for service must be submitted when applying for service.
B. Service Location:
1. The customer shall call Alliant Energy Engineering for assistance and approval when
determining the service location on the building or where the structure supporting the
service will be located.
2. The customer shall provide Alliant Energy with all load information and the proposed
service entrance size and voltage requirements with the application.
C. Charges:
After a review of the site and facilities in the area, Alliant Energy will notify the customer if
additional charges are required to cover the cost for the service.
D. Easements:
1. The customer shall provide Alliant Energy a recorded copy of the Certified Survey or Plat
plan of the property where the service will be required.
2. The customer shall provide government approved forms indicating the location of any
existing or proposed septic systems.
3. The customer shall provide easements for service and/or distribution facilities where
required.
E. Line Clearance:
The customer shall be responsible for clearing any trees or brush preventing service installation
of Alliant Energy facilities.
F. Wiring Inspections:
1. Customer wiring installations shall meet the minimum requirements set forth by the state
regulatory commissions and any local authority having jurisdiction. Alliant Energy shall
receive written approval from the Authority Having Jurisdiction (AHJ).
2. Where no inspection authority exists, Alliant Energy shall receive a signed copy of the
Wiring Statement – Certificate of Electrical Inspection before energizing any new or rewired
electrical service available from Alliant Energy.
3. Alliant Energy reserves the right to inspect for compliance with this ESR Manual but
assumes no responsibility for inspection of the customer’s installation
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ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
G. Definitions
1. “Building” is defined as a structure which stands alone or which is separated from
adjoining structures by fire walls. Check with local building inspector when there are
questions as to whether the building in question is a single building or classified as more than
one building. The local AHJ will make the final determination as to the building
classification.
2. “Structure” other than a building is defined as a substation, pole, pedestal, vault, padmounted switchgear, communication tower or other structure specifically approved by
Alliant Energy.
3. “Electrically Isolated Building” is defined as a building where there are no continuous
metallic paths to any other building or structure. These metallic paths include but are not
limited to: electrical conduit and wiring (phase, neutral or equipment grounds),
communication systems (telephone, coaxial cable, data lines, etc.) and metallic piping (water,
steam, hydraulic, augers, fencing, etc.). Separation to other buildings, structures and
equipment must be sufficient to prevent lightning flashover.
4. “Row-house” is defined as three or more contiguous living units, not more than three
stories high. It is separated by firewalls having a minimum one-hour fire resistive rated
construction which extends from the foundation to the underside of the roof deck with no
doors or windows in the firewall.
For additional information, contact Alliant Energy Engineering at 1-800-ALLIANT (800-255-4268).
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ELECTRIC SERVICE RULES
GENERAL INFORMATION
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108. SERVICE VOLTAGES AND MAXIMUM AMPERAGE (600 Volt OR LESS)
Standard (600 Volt or less) service voltages provided by Alliant Energy are listed below. (Not every
voltage is available at every location). For service voltages greater than 600 Volts see Chapter 10
- Primary Service.
MAXIMUM SERVICE ENTRANCE AMPERAGE
TRANSFORMER
POLE-MOUNT
POLE-MOUNT
PAD-MOUNT
SERVICE
OH
UG
UG
120/240V- 1 Phase
6002, 8
4004, 8
6002, 8
120/208V-1 Phase
2001
2001
2001
120/208V-3 Phase
12003, 5
4004
30003, 6
277/480V-3 Phase
2007/6002
2007/4009
2007/30003, 6
SUPERSCRIPTS:
1. Available only from an existing 120/208V 4 wire system, max. 200 amp network meter.
2. 600 amp Continuous Duty service or 800 amp Intermittent Duty Service, limited by loading on
167 kVA transformer.
3. Continuous Duty Service.
Service entrance equipment listed as “Continuous Duty” may be operated at its full load for 3
hours or more. Those listed as “Intermittent Duty” may only be operated at 80% of its full load
for long periods and 100 % of full load for short periods, depending upon its design.
4. 600 amps may be allowed with engineering approval in areas where access is designated as aerial
lift access only.
5. Limited by loading on 3-167 kVA transformers.
6. Limited by loading on the largest available Pad-Mounted Transformer for the service voltage
being utilized.
7. Requires disconnect ahead of the meter-socket that has a maximum SCCR of 10,000. In order
to limit the SCCR, limited to maximum loading on 3 – 50 kVA transformers. Applies to selfcontained 480 volt installations.
8. In areas near livestock, may be limited to 300 amps, contact Alliant Energy Engineering.
9. Limited by capacity of maximum of parallel 350 MCM AL risers, the ampacity is limited to 400
amps by the cable riser capacity.
NOTES:
1. All services are intermittent duty unless stated otherwise.
2. All services have grounded neutral conductor.
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ELECTRIC SERVICE RULES
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109. NUMBER OF SERVICES
Alliant Energy provides each parcel of land or property with only one service (refer to Section 108
for service sizes). It is supplied by one overhead service drop or underground service lateral to a
building or structure located on a non-contiguous parcel of land or property. Multiple adjacent
parcels, used in a single operation, are considered one parcel. Reference: NEC 230.2
Additional services may be permitted with approval from Alliant Energy Engineering, if the
following requirements have been met:
A. PRIMARY SERVICE
1. When a property is served at a primary distribution or transmission voltage the single service
to the parcel of land rule applies. A second service at a transformed secondary voltage is not
allowed with the exception of a fire pump service as indicated in paragraph (2) of this
section. If buildings or structures or both, on a parcel of land have service at both primary
and secondary voltages; this may have been allowed in the past, Alliant Energy now will
require service upgrades to meet present NEC and ESR requirements.
2. Primary Service Exception (For Existing Primary Service Customers ONLY)
A separate secondary voltage service may be provided for supplying fire pumps or
emergency systems, when the general service is at primary voltage. Fire pump or emergency
services are treated as standby service/duplicate facilities according to Alliant Energy’s
extension rules.
3. Backup Service
A backup service is allowed as a separate service to the customer’s property, but may only be
utilized when the primary service is not available. Both primary and backup services shall
share common metering. The backup service shall have an open switch at the perimeter of
the customer’s property, separating this service feed from the main service feed to the
customer’s load. When the customer’s main feed is interrupted, the open switch for the
backup service will be closed by Alliant Energy to pick up the customer’s load.
B. UNDERGROUND SECONDARY NETWORK SERVICE
Underground network service shall comply with the Network Standards.
Totalized metering may be used within the underground network system. The meter shall serve
only one customer with facilities located contiguously within one city block having loads in
excess of 500KW at 277/480V or an equivalent load. Alliant Energy will review each request to
determine feasibility and cost of such metering schemes.
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GENERAL INFORMATION
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C. SECONDARY SERVICE
Alliant Energy Engineering shall approve each exception for multiple services.
2011 NEC 230.2E - Where a building or structure is supplied by more than one service or
any combination of branch circuits, feeders and services, a permanent plaque or directory
shall be installed at each service disconnect location denoting all other services, feeders and
branch circuits supplying that building or structure and the area served by each.
2011 NEC 250.58 - Where separate services, feeders or branch circuits supply a building and
are required to be connected to a grounding electrode(s), the same grounding electrode(s)
shall be used.
Informational Note: The number of services is limited to increase safety for occupants and first responders, improve power quality and to control overall costs. To limit the installation of more services than are technically needed, some utilities charge for transformers separately rather than building the cost of the transformer into their rates. Alliant Energy does not bill separately for each individual transformer, therefore, the following spacing requirements exist. 1. Distance Exceptions:
a) Buildings
For buildings of large area, a second building or a remote structure, Alliant Energy may
provide a second service at any available secondary voltage. The new service shall be
located 150 ft. from the existing 120/240 Volt service or 120/208 Volt 3-phase service.
If either the existing or the new service is 277/480 volt, 3-phase, a 300 ft. separation
shall be maintained. Each of the above distances is measured in a straight line. All load
side conductors supplied for each service shall have no common raceway or connection
with any other service. The creation of a second building (by definition) with the
construction of a three-hour firewall does not remove these distance requirements.
Informational Note: The 150 ft. minimum spacing is from Wisconsin’s State Electrical Code SPS 316. The intent of the 150 foot is to limit the number of services while not causing voltage drop issues on a 120/240 Volt service or 120/208 Volt 3‐phase service in a building. When the minimum spacing for 277/480 Volt services was established, consideration was given to having one spacing between a 120/208 Volt service and a 277/480 Volt service and a greater spacing between two 277/480 Volt services, but 300 ft. was used for simplicity of application. Many utilities have a 500 ft. minimum spacing when one of the services is 277/480 Volts and a few utilities have a 1,000 ft. minimum spacing requirement when both services are 277/480 Volts. Using the voltage ratio of 277/120 squared, the minimum spacing for 277/480 Volt services would be 800 ft. b) Structures (other than a building)
Services may be installed on multiple structures, if they are no closer than 300 ft. apart,
(measured in a straight line) and if all load side conductors supplied by each service have
no common raceway or connection with any other service.
Informational Note: For structures, other than a building, the minimum was increased to 300 ft. because conductors typically extend directly to the loads and don’t follow the outline of a building. Consequently, most conductor lengths will be shorter, decreasing voltage drop issues. Page7
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ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
2. Multiple Occupancy Buildings Exception (NEC 230.2B):
A separate service may be provided for each multiple metered building. Multi-metered
buildings may have a second service provided the distance separation requirements are met.
3. Load Exceptions:
a) Single-Phase Service
An existing single-phase customer whose, 120/240 Volt load requirements exceed the
ability of a 167 kVA transformer to serve the load shall convert to a three-phase service.
The new service shall be a 120/208 or a 277/480 Volt, three-phase, four-wire service.
This new service shall be sized to handle all existing and future loads of the combined
services to facilitate prompt retirement of the 120/240 Volt single-phase service. If it is
not feasible to retire the single-phase service when the three-phase service is energized,
the customer may, with written permission from Alliant Energy Engineering, have up to
six months to complete the transfer of all loads to the new service. At the end of the
transition time, the single-phase service will be removed. If the single-phase service is
temporarily left energized to facilitate load transfer, the new service entrance shall be
located adjacent to the first service entrance to facilitate the use of the same grounding
electrode system by both services as required by the NEC 250.58.
b) Three-Phase Service
It is preferred that customers upgrade to the maximum allowed underground service size
before considering a second service. However, if the total demand of an existing service
plus the estimated demand of a proposed expansion is greater than 430 KW at 120/208
Volts or 1 MW at 277/480 Volts, an additional service may be provided adjacent to the
first service entrance. When multiple services are installed, they shall be of the same
voltage.
c) 120/240 Volt Delta Service
When the demand of an existing three-phase 120/240 Volt Delta, four-wire customer
exceeds the rated capacity of the customer’s existing service entrance, the customer shall
convert to a 120/208 or a 277/480 Volt three-phase, four-wire service. This new service
shall be sized to handle all existing and future loads of the combined services to facilitate
prompt retirement of the 120/240 Volt delta service. If it is not feasible to retire the
delta service when the new service is energized, the customer may, with written
permission from Alliant Energy, have up to six months to complete the transfer of all
loads to the new service. At the end of the agreed upon transition time, the delta service
will be removed. If the delta service is temporarily left energized to facilitate load
transfer, the new service entrance shall be located adjacent to the first service entrance to
facilitate the use of the same grounding electrode system by both services as required by
the NEC 250.58.
4. Electrically Isolated Building Exception:
For another building, an additional service may be provided, where there are no electrically
conductive paths to another building or structure. Services provided by this exception are
treated according to Alliant Energy’s extension rules.
Page8
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
5. Special Conditions Exception:
The preferred way to service loads listed in NEC 230.2(A) Special Conditions, is by
connecting to the supply side of the service disconnect as allowed in NEC 230.82. The
customer’s special service will be served along with the main service from a single common
drop or lateral.
As an alternative, a customer may also have a separate service drop or lateral and meter.
These services are treated as standby services /duplicate facilities according to Alliant
Energy’s extension rules.
a) Fire Pumps
b) Emergency systems
c) Legally required standby systems
d) Optional standby systems
e) Parallel power production systems
f) Systems designed for connection to multiple sources of supply for the purpose of
enhanced reliability
6. Special Occupancies Exceptions:
For row-house construction a separate drop or lateral may be provided for each two
attached units. Buildings must comply with the unique building codes specifically intended
for row-houses only. This does not apply for condominiums. See item C-1 above in this
section regarding the distance requirement for condominium project exceptions.
7. Zero Lot Line Buildings:
Buildings separated by a common wall:
a) If it is one building; then one service lateral with a multi-meter socket
b) If the buildings have a fire barrier(s)
(1)
as allowed by the local AHJ, then each building
may have a separate service.
1) Fire barriers shall extend from the top of the floor/ceiling assembly below to “THE
UNDERSIDE OF THE ROOF SLAB OR DECK ABOVE”, (IBC Chapter 7),
no HVAC vents or other piping between the units through the firewall and no
metallic paths may bond the two units together.
8. Communication Facilities:
Exception only applies to Iowa. See section 119
Page9
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
110. SHORT CIRCUIT DUTY REQUIREMENTS
The customer’s service equipment and other devices shall be adequate to withstand and interrupt the
maximum available short circuit current (Fault Current). Consult Alliant Energy for the available
short circuit duty when requesting the location for service entrance facilities.
Definitions:
1. Short Circuit Current Requirements (SCCR) – The prospective symmetrical fault current
at a nominal voltage to which an apparatus or system is able to be connected without
sustaining damage exceeding defined acceptance criteria (NEC 100).
2. Fault Current – is an abnormal current in an electrical circuit due to a fault, usually a short
circuit or abnormally low impedance path. Fault Current comes in three varieties; phase-toneutral fault, phase-to-phase fault and phase-to-earth ground fault.
3. Ampere Interrupting Capacity (AIC) – This applies to circuit breakers and their ability to
open and protect a circuit with a specific amount of current flowing in the circuit. Short
Circuit Current Ratings are from 10,000 to 65,000 amps.
Informational Note: The Short Circuit Current Ratings listed are the greater of the phase to phase or the phase to neutral currents. Increasing a substation size and distribution conductor up to Alliant Energy’s largest standard size has been taken into account. The ratings listed are for the selection of equipment. For setting overcurrent protection for Selective Coordination, contact Alliant Energy Engineering for additional information. A. RESIDENTIAL SERVICE EQUIPMENT:
MINIMUM SHORT CIRCUIT CURRENT RATINGS
120/240 VOLT, SINGLE-PHASE & 120/208 VOLT, SINGLE/THREE-PHASE
TOTAL AMPERAGE RATING OF ALL
MINIMUM SHORT CIRCUIT CURRENT
SERVICE ENTRANCE EQUIPMENT ON AN
RATING FOR SERVICE EQUIPMENT ON
OVERHEAD SERVICE DROP OR
SPECIFIC SERVICE AMPERES 2
1
UNDERGROUND SERVICE LATERAL
60-150
10,000 (any svc length)
200
10,000 (svc length> 25’)
151-400
22,000
401-1000
42,000
1001-3000
65,000
NOTES:
1. Total amperage ratings of all present and future service entrance equipment connected to the
same overhead service drop or underground service lateral
2. Consult with Alliant Energy Engineering for assistance for any special application.
Page10
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
B. COMMERCIAL AND AGRICULTURAL SERVICE EQUIPMENT
MINIMUM SHORT CIRCUIT CURRENT RATINGS
120/240 VOLT, SINGLE-PHASE
TOTAL AMPERAGE RATING OF ALL
MINIMUM SHORT CIRCUIT CURRENT
SERVICE ENTRANCE EQUIPMENT
RATING FOR SERVICE EQUIPMENT 2
CONNECTED TO THE TRANSFORMER 1
(AMPS)
60-150
10,000
151-400
22,000
401-800
42,000
120/208 VOLT, THREE-PHASE
TOTAL AMPERAGE RATING OF ALL
MINIMUM SHORT CIRCUIT CURRENT
SERVICE ENTRANCE EQUIPMENT
RATING FOR SERVICE EQUIPMENT 2
1
CONNECTED TO THE TRANSFORMER
(AMPS)
60-400
22,000
401-800
42,000
801-3000
65,000
277/480 VOLT, THREE-PHASE
TOTAL AMPERAGE RATING OF ALL
SERVICE ENTRANCE EQUIPMENT
CONNECTED TO THE TRANSFORMER 1
60-200
201-400
401-1600
1601-3000
MINIMUM SHORT CIRCUIT CURRENT
RATING FOR SERVICE EQUIPMENT 2
(AMPS)
10,0003
25,000
35,000
65,000
NOTES:
1. Total amperage ratings of all present and future service entrance equipment connected to the
same distribution transformer
2. Minimum fault current equipment requirements do not apply to customer yard pole (CYP) pole
top switches.
3. Self-contained meter service applications are limited to a single service and have a maximum
transformer size of 150 KVA for OH and 300 KVA if pad-mounted.
4. Consult Alliant Energy Engineering for assistance with special applications, such as oversized
transformers for high harmonic loads and other applications not covered by these tables.
C. MAXIMUM AVAILABLE FAULT CURRENT - Consult with Alliant Energy Engineering
Page11
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
111. INSPECTIONS AND MAINTENANCE
In areas where electrical inspectors are provided, the inspector is the Authority Having Jurisdiction
(AHJ) on all issues dealing with customer owned electrical wiring facilities.
112. SERVICE CONNECTIONS
Alliant Energy will make all service connections to its electric distribution system. Connection to or
alteration of Alliant Energy’s electric service facilities or other equipment is prohibited and is subject
to immediate disconnection.
113. IDENTIFICATION OF CONDUCTORS
A. The neutral or grounded conductor of a service entrance (480 V and under) shall be identified
by a white or gray color/ tape or by three continuous white stripes on other than green
insulation along its entire length.
B. On 4-wire, delta connected secondary, where the midpoint of one phase winding is grounded to
supply lighting and similar loads, the phase conductor having the higher voltage to ground shall
be identified by an outer finish that is orange in color, by tagging or other effective means. Such
identification shall be placed at each location where a connection is made if the grounded
conductor is also present.
114. CAPACITY
A. Service entrances shall have ample capacity per NEC Article 220 for any electrical load that may
reasonably be expected to develop. All current carrying components of the metering installation
shall have an ampacity rating equal to or greater than the required ampacity rating of the service
entrance conductors.
B. The customer shall give Alliant Energy reasonable notice of substantial load increases
(permanent or temporary) which may require Alliant Energy to increase the capacity of its
facilities. Customers who fail to notify Alliant Energy will be charged for the replacement cost of
damaged Alliant Energy equipment.
C. For customer installations of two to six breakers or sets of fuses, on the load side of a
termination box or current transformer cabinet, the sum of the ratings of the circuit breakers or
fuses shall be permitted to exceed the rating of the termination box or instrument transformer
cabinet if the load is calculated in accordance with NEC Article 220. The NEC Article 220 load
calculations shall be provided in writing to Alliant Energy.
1) If an Article 220 load calculation is not available, the amperage rating of an enclosure for the
two to six switches would be an indication of the potential maximum load. That load shall
not exceed the ampacity rating of the termination box or current transformer cabinet.
D. The rating of the service disconnect is to be not less than the calculated load to be carried and
not the actual load carried. (NEC 230.79)
E. The combined service or current protection rating shall not exceed the ampacity rating of the
self-contained meter socket. Self-contained metering is limited to 300 amps capacity. Adjustable
breakers whose maximum rating, either individually or in combination, exceed the rating of the
self-contained meter, are prohibited.
Page12
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
F. Meter disconnect switches, nominally rated not in excess of 600 volts, shall have a short circuit
rating equal to or greater than the available short circuit current. These devices shall also be
grounded and bonded according to parts V & VII of Article 250. (NEC 230.82)
115. CHANGES TO CUSTOMER’S EXISTING SERVICE-ENTRANCE EQUIPMENT
A. When the customer is changing the ampacity of their service disconnect(s), they must meet the
current version of the NEC and the ESR Manual.
B. When the customer modifies their service in any way that requires them to adhere to the current
NEC, they shall also adhere to the current ESR Manual.
C. Moving or relocating the service entrance to new or different location shall constitute an
upgrade.
116. ALLIANT ENERGY EQUIPMENT ON CUSTOMER PREMISES
A. Customers shall grant Alliant Energy the right to install its equipment on the customer’s
premises to supply service. All such equipment shall remain Alliant Energy property and may be
removed when service is no longer required.
B. Alliant Energy shall have the right of access to its equipment located on customer premises for
inspection, maintenance, restoration and removal of service. The customer shall provide,
without cost to Alliant Energy, the necessary easements and/or right-of-way for Alliant Energy
personnel to install, maintain and access electric facilities that provide service to the customer.
This will include permission to trim and/or remove trees and brush that may interfere with the
installation and operation of Alliant Energy’s facilities.
C. Customers are expected to take reasonable care of Alliant Energy equipment located on their
property. Customers will be responsible for all damages to or loss of Alliant Energy property
located on their premise, unless damage is by causes beyond their control. The customer shall
not grant authority to anyone who is not an employee of Alliant Energy to open or operate
Alliant Energy equipment.
D. Alliant Energy will attempt to give advance notice when accessing utility facilities on the
customer's property, but may not be able to do so during emergencies.
Page13
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
117. SEQUENCE OF DISCONNECTING SERVICE AND METER
The location of the service disconnect, unless specifically approved by Alliant Energy, shall be on
the load side of the metering (meter-switch-fuse) sequence.
Exception #1:
In multiple meter locations where the National Electric Code requires a main disconnect, the
sequence shall be Main Service Disconnect - Meter-Switch-Fuse
Exception #2:
For all 480Y/277 Volt services with self-contained meters, the sequence shall be Switch Meter- Switch - Fuse
Exception #3:
In the Cedar Rapids downtown, the sequence for the network system is Switch – Meter –
Switch - Fuse
118. CUSTOMER INSTALLATION
A. The customer installs, owns and maintains the service entrance equipment and provides a secure
location for holding service wires and service entrance equipment to the building or structure.
All service entrances shall include a service disconnecting means, over-current protection and
Alliant Energy approved metering equipment located in the vicinity of where electric service is
supplied to the building or structure.
B. The NEC states where the service disconnects may be located. The Wisconsin State Electrical
Code, Chapter SPS 316, states where the customer owned service entrance conductors and
service disconnects may be located in Wisconsin. The Electric Service Rule Manual states where
utility owned service conductors shall be located, terminated and metered.
1. The National Electrical Code in Section 230.70(A) limits the location of the service disconnect
to a readily accessible location either outside of the building or inside nearest the point of
entrance of the service conductors location.
2. The Wisconsin State Electrical Code in SPS 316.230(3)(b) states that conduits for service
conductor located according to NEC 230-70(a) can extend no more than 8 feet into the
building from the point they enter the inside of building through the outside wall or concrete
floor. (WP&L Only)
Informational Note: The Wisconsin 8 ft. rule is in addition to NEC 230.70(A). In Wisconsin, service entrance disconnects, when located inside, must be near the point of entrance of the service conductor and must be within 8 ft. of where the conductors enter the building through the outside wall or concrete floor. 3. Alliant Energy’s ESR Manual limits the location and termination of utility owned service
conductors to an installation on the outside of the customer’s building or structure.
Page14
Chapter 1
ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
119. COMMUNICATION TOWER INSTALLATION
A. All communication towers are considered structures. Alliant Energy will provide either one
underground service lateral or one overhead service drop to a tower site, regardless of the
number of tower users.
Iowa Exception:
B.
C.
D.
E.
F.
G.
In the event that communication facilities are installed on an existing structure .i.e. (water tower,
grain bin, etc.) that is served by a voltage other than that required by the communication user, a
second service at the desired voltage may be permitted, with approval from Alliant Energy
Engineering. The second service, at the different voltage, shall be located immediately adjacent
to the first service entrance to facilitate the installation of the required bonding conductor
between the two main disconnects.
The tower owner will be responsible for providing metering and service entrance facilities to
serve all tenants utilizing the tower facilities
Metering shall be made accessible to Alliant Energy personnel. Metering shall be installed in one
of the following ways:
1. Outside of the customer’s secured area.
2. Inside a common fenced area or a separately fenced area and provide provisions for an
Alliant Energy padlock. The metering shall be located 4’ to 5’ from the edge of the fence to
facilitate reading the meters through the fence.
When additional customers request service, Article 220 load calculations are required before the
new service(s) will be energized.
The normal sequence shall be meter-switch-fuse, if it is six meters or less. If in the future,
more than six meters will be required, the customer shall install a service disconnect for a
grouped meter assembly of modular design and factory bussed. The sequence would then be
switch-fuse-meter-switch-fuse.
The tower owner is required to install sufficient meter positions when the first tenant goes on
the tower to accommodate all possible tenants. Label each position as Unit #1, Unit #2, etc. Do
not use tenant names as tenants may change.
Communication towers are considered a commercial account and shall have lever-by pass meter
sockets. Each meter shall be placarded where multiple meters are installed.
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ELECTRIC SERVICE RULES
GENERAL INFORMATION
Issued Jan 2016
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Page16
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
Issued Jan 2016
ELECTRIC SERVICE RULES – TEMPORARY SERVICE
200.
CHAPTER 2
GENERAL
A. A service application is required for all temporary services. Alliant Energy will approve the
location of all temporary service requests.
B. Temporary services cannot be active more than one entire calendar year.
C. Customers with temporary services shall notify Alliant Energy when the temporary service is no
longer needed. Alliant Energy will then disconnect the temporary service from the customer’s
facilities.
D. The customer shall pay all costs for Alliant Energy to install and remove the temporary service.
The customer is also responsible for the energy usage costs.
E. Temporary installations may not be reclassified as permanent unless such installations are
constructed to conform to permanent requirements.
F. Customer-owned temporary service entrances are not permitted on Alliant Energy-owned poles.
G. Working space clearances, as defined by NEC 110.26, are required for temporary services.
H. Large capacity (greater than 200 Amps), three-phase and primary temporary services - The
customer shall submit specific proposals for approval from Alliant Energy’s field engineering
department at 1-800-ALLIANT (800-255-4268).
Informational Note: The Service Entrance of a Temporary Service must meet all the requirements of NEC Article 230 Parts I through VIII that is required for permanent service entrances. Page17
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
201.
Issued Jan 2016
OVERHEAD TEMPORARY SERVICE, SINGLE-PHASE, 3-WIRE, 120/240
VOLT, 200 AMP MAX (FOR CONSTRUCTION SITES)
Item
No.
Description
Furnished &
Installed By
Utility
1
2
3
4
5
6
7
8
9
10
Pole min. class 7 or 4” X 4” treated post Min. 4’ in Ground
Service entrance wires with 36” leads
Rigid conduit or SE cable
Ground in accordance with the NEC (see Chapter 14)
2 braces of 2”X4”x16’ or supporting guy
Fused main disconnect switch or main
Furnished &
Installed By
Customer
X
X
X
X
X
X
X
Service dead-end
X
Approved Meter socket
X
X
Overhead service drop (100’ max.)
Meter
NOTES:
1. Customer pole shall maintain minimum 10’ horizontal separation from Alliant Energy facilities
2. Attachment point shall be 6 - 12” below weatherhead
3. Services shall not be installed across public streets, roads, railroad tracks, or driveways
4. Panel boards shall be marked as suitable for use as service entrance equipment. Panel boards
with more than two single pole breaker positions require a main disconnect, or breaker.
5. Panel boards and installed breakers shall be rated for a minimum of 22,000 amperes of fault
current if located within 35 feet of a 50-kVA transformer or 100 feet of a 100-kVA transformer.
Page18
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
201.
Issued Jan 2016
OVERHEAD TEMPORARY SERVICE, SINGLE-PHASE, 3-WIRE, 120/240
VOLT, 200 AMP MAX (FOR CONSTRUCTION SITES) - CONTINUED
Page19
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
202.
Issued Jan 2016
UNDERGROUND TEMPORARY/PERMANENT SERVICE - SINGLE-PHASE,
3-WIRE, 120/240 VOLT, 200 AMP MAX (FOR CONSTRUCTION SITES)
PREFERRED CONSTRUCTION
Item Description
No.
1
2
3
4
5
6
Furnished &
Installed By
Utility
X
X
Meter
Utility UG service conductors
Approved pedestal (See ESE E116)
Customers main (Inside Panel)
Customer’s feeder panel
Ground in accordance with the NEC (see Chapter 14)
Furnished &
Installed By
Customer
X
X
X
X
NOTES:
1. Approved Pedestal (See ESE Book section E116) can be ordered with GFCI duplex receptacles
for use by the contractor for construction
2. Pedestal has separate exit channel for a breaker protected feeder to another building or structure
3. Device will satisfy service requirements for permanent service when temporary use is no longer
required.
a. Temporary service costs may be avoided
b. No need for Alliant Energy to make another trip to energize the permanent service
Page20
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
202.
Issued Jan 2016
UNDERGROUND TEMPORARY/PERMANENT SERVICE - SINGLE-PHASE,
3- WIRE, 120/240 VOLT, 200 AMP MAX (FOR CONSTRUCTION SITES)
PREFERRED CONSTRUCTION
Page21
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
203.
Issued Jan 2016
UNDERGROUND TEMPORARY SERVICE - SINGLE-PHASE, 3-WIRE, 120/240
VOLT, 200 AMP MAX (FOR CONSTRUCTION SITES)
Item
No.
Description
1
2
3
4
5
Service lateral LFMC* or LFNC**
Meter
Approved meter socket
Ground in accordance with the NEC (see Chapter 14)
Fused main disconnect switch or main circuit breaker with
GFCI outlets
4”x 4” treated wood post or approved manufactured pedestal
6
Furnished &
Installed By
Utility
Furnished &
Installed By
Customer
X
X
X
X
X
X
*LFMC – Liquid tight Flexible Metal Conduit – See NEC – 350
**LFNC – Liquid tight Flexible NON-Metal Conduit – See NEC – 356
NOTES:
1. Temporary pedestal will be placed within 3 feet of Alliant Energy’s supply source
2. Panel boards and pedestals shall be marked as suitable for use as service entrance equipment.
Panel boards with more than two single pole breaker positions require a main disconnect
(breaker).
3. Panel boards, pedestals and installed breakers shall be rated for a minimum of 22,000 amperes of
fault current if located within 35 feet of a 50 kVA transformer or 100 feet of a 100 kVA
transformer.
Page22
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
203.
Issued Jan 2016
UNDERGROUND TEMPORARY SERVICE - SINGLE-PHASE, 3-WIRE,
120/240 VOLT, 200 AMP MAX (FOR CONSTRUCTION SITES)
Page23
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
204.
Issued Jan 2016
UNDERGROUND TEMPORARY SERVICE FOR CONSTRUCTION SITES –
SINGLE-PHASE, 120/240 VOLT 200 AMP MAX
Item Description
No.
1
2
3
4
5
6
7
8
9
Furnished &
Installed By
Utility
Approved meter socket
Service lateral LFMC* or LFNC
Ground in accordance with the NEC (see Chapter 14)
Fused disconnect switch or circuit breaker with Weatherproof
GFCI Receptacles
4” x 4” treated wood post or approved manufactured pedestal
conduit straps over LFMC
Meter
2” x 4” wood cross-member to support LFMC
4” x 4” wood stake with 2” x 4” lagged for support
Furnished &
Installed By
Customer
X
X
X
X
X
X
X
X
X
NOTES:
1. Temporary pedestal will be placed within 3 feet of Alliant Energy’s supply source
2. Panel boards shall be marked as suitable for use as service entrance equipment. Panel boards
with more than two single pole breaker positions require a main disconnect, or breaker.
3. Panel boards and installed breakers shall be rated for a minimum of 22,000 amperes of fault
current if located within 35 feet of a 50 kVA transformer or 100 feet of a 100 kVA transformer.
Page24
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
204.
Issued Jan 2016
UNDERGROUND TEMPORARY SERVICE FOR CONSTRUCTION SITES –
SINGLE-PHASE, 120/240 VOLT 200 AMP MAX
Page25
Chapter 2
ELECTRIC SERVICE RULES
TEMPORARY SERVICE
Issued Jan 2016
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Page26
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
Issued Jan 2016
CHAPTER 3
ELECRIC SERVICE RULES – OVERHEAD SECONDARY SERVICE
300. SCOPE
This chapter covers the requirements and rules for overhead residential and commercial secondary
services for Alliant Energy customers.
Overhead Service
Page27
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
Issued Jan 2016
301. ATTACHMENT OF SERVICE DROPS
A. The customer’s structure shall be strong enough to support the service drop and high enough to
provide required clearance for the service drop and drip loops above the ground, buildings,
driveways, roads and other facilities.
B. In Wisconsin, Alliant Energy will supply a standard service attachment device, if requested, and
the customer will install the service attachment device. In Iowa, the customer shall provide and
install the attachment device.
C. For connection to Alliant Energy’s service drop wires, the customer’s service entrance
conductors shall project at least 36 inches beyond the weatherhead for a single service riser. See
section 305 for length of conductor tails for multiple risers.
D. Neutral conductors are to be identified according to the National Electric Code (NEC).
E. A maximum of three conduit risers will be allowed at the building or structure.
F. The maximum height Alliant Energy will attach a service drop to a building is 20feet above the
ground. If a greater attachment height is required, customer shall obtain prior approval from
Alliant Energy Engineering.
302. SERVICE MAST CONSTRUCTION
A. Service masts for support through the roof shall be constructed of Rigid Galvanized Steel (RGS)
conduit with an inside diameter of no less than two inches. Intermediate Metal Conduit (IMC) is
not allowed as a service mast through the roof. See Table 302 on next page.
B. The portion of the mast above the uppermost conduit support (roof line) shall be continuous in
length without couplings.
C. Some service masts over 48 inches may require guying. Contact Alliant Energy before
constructing masts more than 48 inches above the roof line.
D. Service masts shall not extend more than 6 feet above any sloped roof. This height is measured
from the point where the conduit exits the enclosed portion roof to the top of the weatherhead.
E. Only power service-drop conductors shall be permitted to be attached to a service mast - NEC
230.28.
Page28
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
Issued Jan 2016
MAXIMUM HEIGHT OF WEATHERHEAD ABOVE SUPPORT
ON AN UNGUYED SERVICE MAST
Heavy loaded service drop tension may not exceed 500 LBS.
Table 302
Type of
Conduit
Material
Conductor
Size
SERVICE
DROP
LENGTH
2”
Conduit
2 ½” *
Conduit
3” *
Conduit
#2
Aluminum
Triplex
30’
40’
50’
60’
70’
80’
6’-0”
6’-0”
5’-10”
5’-1”
4’-7”
4’-1”
8’-0”
8’-0”
8’-0”
8’-0”
7’-6”
6’-8”
8’-0”
8’-0”
8’-0”
8’-0”
8’-0”
8’-0”
#1/0
Aluminum
Triplex
30’
40’
50’
60’
70’
80’
6’-0”
6’-0”
5’-0”
4’-4”
3’-11”
3’-7”
8’-0”
8’-0”
8’-0”
7’-2”
6’-4”
5’-8”
8’-0”
8’-0”
8’-0”
8’-0”
8’-0”
8’-0”
Rigid
Galvanized
Steel (RGS)
Conduit
NOTES:
Service masts cannot extend more than 6 ft. above any sloped roof regardless of the slope. They can
however extend to more than 6 ft. above a flat roof where a ladder can be safely used.
Page29
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
303.
Issued Jan 2016
SERVICE MAST INSTALLATION FOR FLAT OR LOW-ROOFED BUILDINGS
UP TO 1200 AMPS – 480 VOLTS MAX
NOTES:
1. The customer shall consult Alliant Energy before above installation above is planned or started.
2. The customer shall install, own and maintain the installation except for Alliant Energy’s service
drop, connectors and cable dead-end.
3. The customer shall consult with Alliant Energy for the service cable tensions and provide a
structure of adequate strength. The installation shall meet required clearances for the Alliant
Energy’s overhead service drop.
Page30
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
304.
Issued Jan 2016
SERVICE ATTACHMENT TO BRICK OR MASONRY WALLS AND METAL
BUILDINGS UP TO 1200 AMPS – 480 VOLTS MAX
NOTES:
1. The customer shall consult Alliant Energy before above installation above is planned or started.
2. The customer furnishes, installs and maintains the installation except for Alliant Energy’s service
cable and connectors.
3. Consult with Alliant Energy for service drop tensions and provide an attachment with adequate
strength. The installation shall meet required clearances for the Alliant Energy’s overhead service
drop.
Page31
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
305.
Issued Jan 2016
SERVICE RISER REQUIREMENTS
NOTES:
1. Cable tray or raceway must be NEMA 3R and sealable by Alliant Energy.
2. Refer to Section 108 for maximum allowable entrance size for each service voltage.
3. The customer shall consult Alliant Energy before planning an installation with multiple risers.
4. Where multiple risers are installed, leave ends at the weatherhead a minimum
60’’ long to be connected by Alliant Energy.
Page32
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
306.
Issued Jan 2016
WALL OR THROUGH-THE-ROOF INSTALLATION – PREFERRED
CONSTRUCTION
Item
No.
Description
Furnished &
Installed by
Utility
X
X
X
(Wisconsin Only)
1
2
3
Overhead service drop
4
5
6
7
8
9
10
11
12
Conduit or service cable and weatherhead
Meter
Cable wire holder
Disconnect for 480 volt service
Conduit or cable supports (as required)
Approved meter socket
Ground in accordance with the NEC (see Chapter 14)
Customer’s service entrance panel
Rigid Steel Conduit
Conduit guy if required – ¼” Min. Galv. Steel
Bracing between studs for guying hardware
Page33
Furnished &
Installed by
Customer
X
(Iowa Only)
X
X
X
X
X
X
X
X
X
Chapter 3
ELECTRIC SERVICE RULES
OH SECONDARY SERVICE
307.
Issued Jan 2016
POLE MOUNTED SERVICE ENTRANCE UP TO 300 AMP – 240 VOLTS MAX OPTIONAL CONSTRUCTION
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
Overhead service cable
Socket type meter
Pole, treated, class 6 minimum, 5” dia. at top
Guy, Galv. stranded steel, ¼” minimum
Ground in accordance with the NEC (see Chapter 14)
Conduit or service entrance cable
Rain-tight weatherhead
Service entrance equipment
Approved meter-socket
Guy Guard
Anchor
Furnished &
Installed by
Utility
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
X
NOTES:
1. The customer shall consult Alliant Energy before such an installation is planned or started.
2. Our preferred method of construction would be to have this type of service on a building.
3. Customer pole shall maintain minimum 12’ horizontal separation from Alliant Energy facilities.
Page34
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
Issued Jan 2016
CHAPTER 4
ELECTRIC SERVICE RULES – UNDERGROUND SECONDARY SERVICE
400. SCOPE
This chapter covers the requirements and rules for underground residential and commercial
secondary services for Alliant Energy customers.
Underground Service
401. GENERAL INFORMATION
A. The underground service lateral is defined as Alliant Energy’s underground service conductors
from the last pole, pedestal, transformer or other Alliant Energy structure, connecting to the
customer's metering point, or termination equipment. Alliant Energy will install, own and
maintain the underground service laterals in accordance with applicable tariffs and extension
rules.
B. Alliant Energy will not terminate service lateral conductors inside the customer’s building or in
customer-owned switchgear. The termination point shall be outside the customer’s building in
free-standing or wall-mounted equipment, (self-contained meters, C.T. cabinets, or a termination
box). Alliant Energy will not terminate on a customer’s circuit breaker or disconnect switch.
C. Before installing service entrance equipment, the customer shall apply to Alliant Energy for
underground service and obtain approval for the service location. The customer shall install,
own and maintain all service entrance facilities other than the service lateral, meters, instrument
transformers and instrument transformer wiring.
D. All underground service cables shall be protected from physical damage. See Rigid Conduit in
Section 408 NEC 230.49-50 & NEC 300.5
Page35
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
Issued Jan 2016
E. All equipment used for the termination of Alliant Energy service conductors shall have
provisions that include landing pads and setscrew connectors.
F. Alliant Energy will install a service lateral when the proposed cable route is clear of all
obstructions and within 6 inches’ of final grade. The customer shall clear a 10 feet wide cable
route of trees and other obstructions at their own expense.
G. Grade changes of more than 6 inches over Alliant Energy’s direct buried cables are not allowed.
402.
SIZING UNDERGROUND FACILITIES
A. Conduit - Number of conduits sized to customer's main disconnect. See Section 408
B. Transformer Pad - Sized to customer's main disconnect. See Section 409 for concrete pad,
Section 411 for single-phase box pad and Section 413 for three-phase box pad.
C. Underground Conductors - Sized to customer's load and to meet all voltage drop and flicker
requirements
D. Transformer - Sized to customer's load
E. Instrument Transformer or Termination Cabinets - Sized to customer’s main disconnect
403.
LOCATION OF ALLIANT ENERGY SECONDARY VOLTAGE CABLES
A. Buildings and Pools
Alliant Energy’s cables (primary or secondary) shall not be located under buildings or pools.
Inform Alliant Energy of plans for future buildings, pools etc.
B. Sidewalks, Hard Surfaced Parking Lots, Driveways, Patios and Decks
1. With approval from Alliant Energy, buried cables may be installed in conduit through these
areas, if no other acceptable route exists.*
*Exception: Cable runs crossing under sidewalks at 90° may not be required
to be installed in conduit, unless there are other circumstances that would
require conduit.
2. With approval from Alliant Energy, a hard surface may be installed over the existing direct
buried cable, provided a conduit with capped ends and tracer/pull wire(s), is/are installed
18-24 inches away and parallel to the existing cable, at a 24-36 inch depth.
3. Conduit, if required, is to be installed by the customer, or at the customer’s expense. Services
under concrete add conduit to 3 feet beyond edge.
C. COMPLIANCE
Whenever a direct buried cable installation is found to be out of compliance with any of the
stated requirements, or in violation of local, state or national codes, the customer's equipment
and/or Alliant Energy facilities will be modified at the customer’s expense to bring the
installation into compliance.
Page36
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
404.
Issued Jan 2016
UNDERGROUND SERVICE INSTALLATIONS
A. SERVICES TO METER SOCKETS
Alliant Energy will provide trench and cable for all underground services to selfcontained individual meter sockets rated 320 amps or less, or a combination of no more
than two grouped sockets serving a building. An expansion joint is not required with a
vertical only conduit that runs from below ground to the meter socket(s). When a service
conductor is installed in conduit(s), such as referred to in 404B, an expansion joint is
required. Where conduit runs are used for services rated less than 300 amps and greater in
length than 20 feet, the customer shall install a pull string in the conduit at the time of the
conduit installation. (Also see drawing 404A)
B. SERVICE TERMINATING IN A CABINET
The customer will furnish and install trench and service conduit for all services terminated
in a group meter assembly or meter-pack of more than two meters, a C.T. cabinet, a
termination cabinet or a service disconnecting device. See 408 for number and size of
conduit(s). An expansion joint shall be required for all services in this category. For all
service where conduit runs are greater in length than 20’ the customer shall install a pull
string in the conduit at the time of the conduit installation. Alliant Energy will provide
service conductor cables and make all connections. Check with Alliant Energy for conduit
size and number required. (Also see drawing 404B)
C. The customer’s service installation shall fully comply with all requirements of the National
Electrical Code (NEC) and those of Alliant Energy.
Page37
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
404A.
404B.
Page38
Issued Jan 2016
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
405.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
Issued Jan 2016
OUTDOOR METER SOCKET, SINGLE-PHASE & THREE-PHASE, 300 AMPS
MAX, 240 VOLTS MAX
Furnished &
Installed by
Utility
X
X
Description
Underground service cable
Meter
Customer service entrance panel
Rigid conduit
Approved meter socket - meter height shall be 5ft. +/- 6”
Concrete sleeve
Conduit expansion joint - required where horizontal
conduit runs are installed
Insulating bushing
Conduit straps
Ground in accordance with the NEC (see Chapter 14)
Bell end
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
X
NOTES:
1. A concrete sleeve is only required where conduit passes through concrete.
2. If installing ground rods and electrode grounding conductor, they shall be installed to the left or
right of the meter socket, not in front of the meter socket.
3. All underground residential meter sockets shall have a minimum rating of 200 amps. All
commercial meter sockets shall be equipped with a lever bypass
4. See clearance section for clearance from other equipment.
Page39
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
406.
Item
No.
Issued Jan 2016
WALL MOUNTED PEDESTAL SERVICE - SINGLE OR DUPLEX - SINGLE OR
THREE-PHASE – WITH OR WITHOUT MAINS 300 AMPS MAX - 240 VOLTS
MAX
Furnished &
Installed by
Utility
X
X
Description
Furnished &
Installed by
Customer
1
2
3
4
Meter
Ground in accordance with the NEC (see Chapter 14)
X
X
5
Concrete sleeve
X
UG service lateral
Approved meter pedestal
NOTES:
1. If installed, the customer’s ground rods shall not be placed within the pedestal. All of the ground
rods shall be installed on the same side of the meter pedestal.
2. The pedestal shall be securely fastened to the building wall or foundation.
3. The grounding electrode conductor may only terminate in a duplex meter pedestal, or single
meter pedestals with a main disconnect(s).
4. A 3’ square area shall be provided for pedestal to facilitate access to cable for repair or
replacement. Conduit is required under concrete and to extend 3’ beyond edge.
Page40
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
407.
Item
No.
1
2
3
6
7
8
Issued Jan 2016
FREE STANDING PEDESTAL SERVICE ENTRANCE – SINGLE PHASE OR
THREE-PHASE - 300 AMPS MAX - 240 VOLTS MAX
Description
Meter
Service lateral
Approved meter pedestal
Ground in accordance with the NEC (see Chapter 14)
Factory stabilization footing
Rigid conduit
Furnished &
Installed by
Utility
X
X
Furnished &
Installed by
Customer
X
X
X
X
NOTES:
1. Customer pedestal shall be used to supply only underground wiring systems for locations where
no substantial buildings are available.
2. Grounding Electrodes shall be installed on the same side of the pedestal.
3. When an entrance trough on the meter pedestal is not divided for metered and un-metered
conductors, the contractor shall provide a conduit exit for the customer's conductors from
disconnect device.
4. Overcurrent devices shall be installed so the bottom of the enclosure containing the overcurrent
device is not less than 2’ above finished grade or working platform. This may require a pedestal
extension.
5. Meter pedestal shall be not less than 12’ from the nearest pole.
Page41
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
408.
Issued Jan 2016
RIGID CONDUIT
A. Rigid conduit includes Rigid Galvanized Steel (RGS), rigid aluminum, galvanized Intermediate
Metal Conduit (IMC), or rigid nonmetallic conduit schedule 80 PVC electrically rated and
schedule 80 equivalent polyethylene. The rigid nonmetallic conduit shall conform to
specifications in Article 342, 344 and 352, of the NEC. Refer to individual sections for specific
installations. Galvanized steel conduit may be either rigid steel or galvanized IMC. It shall not be
Electric Metallic Tubing (EMT).
B. Schedule 40 electrically rated PVC is allowed for horizontal runs 18 inches below final grade and
into pad mounted transformers and pad mounted cabinets.
C. The tables shown below are to be used by Alliant Energy personnel only, as a general guide to
determine the conduit sizes and number for the services listed. The sizes & numbers of these
facilities may have to be modified to take into account the length of the lateral, the customer
loads and any voltage drop considerations that may apply. Alliant Energy will calculate voltage
drop to make the final determinations.
UNDERGROUND SINGLE-PHASE (25 Ft Max.)
Minimum
Bend Radius
Rigid NonMetallic
100
2"
9½"
18"
1
150
2"
9½"
18"
1
200
2"*
9½"
18"
1
300
3"
13"
24"
1
400
4"
16"
30"
2
600
4"
16"
30"
2
800
3
4"
16"
30”
* A 2-1/2 inch conduit may be required if larger conductors are required
Check with Alliant Energy before installing service conduit
Main Service
Disconnect
Amperes
Minimum
Number of
Conduits
Conduit
Size
Minimum
Bend Radius
Galvanized Steel
NOTES:
1. All PVC service conduit elbows shall be preformed.
2. For longer conduit runs containing three or more bends, the customer shall consult with Alliant
Energy for the conduit size and for the radius bend to use.
3. An expansion joint is not required with a vertical conduit run from the meter socket to a depth
of 18 inches. When a horizontal conduit run such as referred to in 404B is required, an
expansion joint is required.
Page42
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
Issued Jan 2016
UNDERGROUND THREE-PHASE (25 feet Max)
Main Service
Disconnect
Amperes
Minimum
Number of
Conduits
Conduit
Size
Minimum
Bend Radius
Galvanized Steel
100
200
300
400
600
800
1200
1600
2000
2500
3000
1
1
1
2
2
3
5
4
5
7
8
3"
3"
4"
4"
4"
4"
4"
5"
5"
5"
5"
13"
13"
13"
16"
16"
16"
16"
24"
24"
24"
24"
Minimum
Bend Radius
Rigid NonMetallic
24"
24"
24"
30"
30"
30"
30"
36"
36"
36"
36"
Check with Alliant Energy engineering before installing service conduit
NOTES:
1. All PVC service conduit elbows shall be preformed.
2. For longer conduit runs containing three or more bends, the customer shall consult with Alliant
Energy for the conduit size and for the radius bend to use.
Page43
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
409.
Issued Jan 2016
CONCRETE PAD SPECIFICATIONS FOR THREE-PHASE, PAD-MOUNT
TRANSFORMERS
A. The customer shall install, own and maintain a concrete pad whenever the underground service
requires a three-phase transformer pad.
B. A clear space of 10 feet shall be maintained in front of the transformer to provide working space
for hot-stick operation of the transformer and 3 feet on all other sides. Transformers or other padmounted equipment shall not be covered with decorative objects for the purpose of hiding the Alliant
Energy equipment from public view. (See 410)
C. Additional transformer pad foundation walls shall be used for locations having poor soil
conditions or a large number of secondary cables. (See 411 & 411A)
D. For a service requiring more than eight conduits, contact Alliant Energy for details on
transformer pad design.
E. The contractor shall contact Alliant Energy for sizes and number of primary and secondary
conduits.
F. Pad mounted CT cabinets may be mounted on an isolated pad, adjacent to the transformer pad,
to accommodate conduit elbow sweeps. Contact Alliant Energy for pad design details and
clearance requirements.
PAD DIMENSIONS
3/4" TO 1 1/2" FRAMING MAT'L
(Contractor to remove when concrete Set)
A
D
F
39" Min.
CONDUIT
E
13 in.
C
Secondary
Primary
G
B
SERVICE SIZE
XFMR
PAD
I
II
KVA
75-500
750-2500
208Y/120
480Y/277
AMPS
100-1200
100-600
1600-3000
800-3000
A
84
105
Page44
B
96
108
C
D
F
G
THICK
NESS
10
14
INCHES
55
17
31
60
17
34
22
27
6
8
E
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
410.
Issued Jan 2016
CONCRETE PAD LAYOUT FOR THREE-PHASE, PAD-MOUNT
TRANSFORMERS
NOTES:
1. All conduits shall enter through the window opening provided in the pad foundation. These
2.
3.
4.
5.
6.
conduits shall be cut off so the top of the conduit is flush with the surface of the pad.
All metallic conduits shall be fitted with an insulating bushing.
When an oil sump is required, excavate 18 inches under and around the pad and fill with coarse
crushed rock – check with the local building code to determine if an oil sump is required.
Concrete mix shall have a minimum strength of 4000 lb./sq. in. after 28 days.
The top of the pad shall be level and all edges and corners rounded off.
The pad shall be reinforced with #4 wire, 4” x 4” welded mesh or equivalent materials with
additional 3/8 inch reinforcing rods around the cable opening. The mesh shall not be less than 1
inch from the edges and opening and 3" below the surface. If the #4 wire, 4"x 4" mesh is not
available, two layers of #10 wire, 6"x 6" mesh, horizontally staggered, may be substituted for the
#4 wire.
Page45
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
411.
Issued Jan 2016
TRANSFORMER CONCRETE PAD FOUNDATION WALL
Foundations shall be used where unstable soil conditions exist to avoid tilting of pad, or where a
large number of secondary cables are required to provide additional cable training area.
NOTES:
1. Top of foundation walls shall be level.
2. Drainage around pad is sloped to allow liquids to will flow away from building.
3. For Pad I use 84” x 96” vault dimensions, For Pad II use 105” x 108” dimensions, for larger
pads consult with Alliant Energy Engineering.
4. See Transformer pad for information for sizing vertical wire mesh used in foundation walls.
TRANSFORMER PAD FOUNDATION WALL- CONTINUED
3/8" re-bar
Front View of
8" Pad Top
4"
Wire Mesh
2"
Front View
Page46
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
Issued Jan 2016
411A. TRANSFORMER CONCRETE PAD FOUNDATION - ALTERNATE
NOTES:
1. Bushings shall be installed on conduits inside foundation to protect conductors.
2. Insert Styrofoam in areas where conduit passes through concrete if conduit is not to be installed
during pours.
3. Approval required from Alliant Energy Engineering prior to the use of this foundation design.
Page47
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
412.
Issued Jan 2016
BOX PAD SPECIFICATION FOR SINGLE-PHASE, PAD-MOUNT
TRANSFORMERS
Top View
NOTES:
1. Alliant Energy furnishes and installs the box-pad, the customer provides and installs the conduit.
2. At Alliant Energy’s discretion, conduit elbows may be eliminated and the customer may extend
3.
4.
5.
6.
the conduit without elbows under the pad to the opening and install conduit bushings.
Contact Alliant Energy Engineering for size and number of conduit.
Box-pads come with 3/8 inch embedded nuts for bolting transformers to pad.
Transformers should not extend over edges of box-pad. Larger transformers with cooling fins
may require the larger box-pad.
A clear space of 10 feet shall be maintained in front of the transformer to provide working space
for hot-stick operation of the transformer and 3 feet on all other sides. Transformers or other
pad-mounted equipment shall not be covered with decorative objects for the purpose of hiding
the Alliant Energy equipment from public view.
Page48
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
413.
Issued Jan 2016
BOX PAD SPECIFICATION FOR THREE-PHASE, PAD-MOUNT
TRANSFORMERS
Max
Weight
SERVICE SIZE
PAD
A
B
C
D
XFMR
KVA
75-300
500-750
1000-1500
2000-2500
208Y/120
480Y/277
AMPS
100-800
100-400
1200-2500
600-1200
3000
1600-2000
N/A
2500-3000
A
60
80
89
122
B
73
72
83
85
C
D
INCHES
58
16
58
16
64
21
75
21
E
24
30
20
20
F
83
83
94
96
G
71
92
100
133
LBS.
7000
9000
13000
21000
½” Threaded Inserts (4X) For Lifting 1000 – 2500 KVA Only 75 – 750KVA Only
NOTES:
1. Customer furnishes and installs box-pad and customer provides and installs conduit. Alliant
Energy may furnish three-phase box-pad, at an additional cost to customer.
2. Refer to section E233 of the Equipment Book for box pad manufacturers.
Page49
Chapter 4
ELECTRIC SERVICE RULES
UNDERGROUND SECONDARY SERVICE
THIS PAGE INTENTIONALLY LEFT BLANK
Page50
Issued Jan 2016
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
CHAPTER 5
ELECTRIC SERVICE RULES – DISTRIBUTED GENERATION
500. SCOPE
This chapter includes distributed or customer-owned generation connected in parallel and operating
with Alliant Energy’s electric distribution system.
For all Distributed Generation (DG) installations, please contact Alliant Energy’s Renewable
Hotline at 1-800-972-5325 or by email at sellmypower@alliantenergy.com.
Customers may also visit alliantenergy.com/sellmypower.
501. AVAILABILITY
DG is available for single and three phase customers where a part or all of the electrical
requirements of the customer are supplied by the customer's generating facilities. Characteristics of
Alliant Energy’s electrical system vary by circuit. Not every size, voltage and "phase" generator can
be connected at every location.
502. PERMMISION TO CONNECT
The customer shall consult Alliant Energy prior to the installation of a parallel generator and supply
the Alliant Energy with the required electrical drawings and data for the proposed installation.
Alliant Energy’s permission is required for each installation and such permission granted shall not
constitute a guarantee or imply Alliant Energy’s liability for satisfactory operation of the customer's
generator. Alliant Energy may specify and require certain protective schemes based on the size,
location and other factors of the generating unit proposed.
503. ELECTRIC RATE
Customer-generated electricity delivered to Alliant Energy’s system will be purchased in accordance
with applicable tariffs and rates.
504. METERING
A. Alliant Energy will furnish and install appropriate meters, (CTs and PTs, if required) to measure
energy flow. Note that additional meter charges may apply.
B. The customer shall furnish, install, own and maintain the necessary electric service entrance
equipment, meter sockets, metering cabinets and related equipment that may be required for
supporting or enclosing Alliant Energy’s metering equipment.
505. COMPANY DISTRIBUTION SYSTEM
Modifications and additions to Alliant Energy’s electrical distribution system to accommodate
distributed generation systems are treated as standby or duplicate facilities according to Alliant
Energy’s extension rules.
Page51
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
506. TECHNICAL INFORMATION
IOWA
 IPL Technical Guidelines and Requirements for Interconnection of Parallel Operated
Generation Connected to the Interstate Power and Light Electric Distribution System
 The Iowa Administrative Code Chapter 45
WISCONSIN
 WPL Technical Guidelines and Requirements for Interconnection of Parallel Operated
Generation Connected to the Wisconsin Power and Light Electrical Distribution System
 PSC 119 – Rules For Interconnecting Distributed Generation Facilities
 Standard Distributed Generation Application Form (Generation 20 kW or Less)
 Standard Distributed Generation Application Form (Generation 20 kW to 15 MW)
 Distributed Generation Interconnect Agreement (20 kW or less)
 Distributed Generation Interconnect Agreement (20 kW to 15 MW)
507. CONTRACT
Alliant Energy will require an interconnect agreement specifying technical and operating aspects of
distributed generation.
508.
INSURANCE (See Standard Interconnection Agreement)
509.
GENERATOR OPERATION (See Standard Interconnection Agreement)
510.
GENERATOR MAINTENANCE (See Standard Interconnection Agreement)
511.
GENERATOR PROTECTION (See Standard Interconnection Agreement)
512. ISOLATION
The customer shall provide an isolating device to automatically disconnect the customer’s generator
from Alliant Energy’s electrical system in the event of a power outage. The isolating device shall not
re-close until after power is restored to Alliant Energy’s electrical system. The isolating device may
be a circuit breaker, relay contacts, switch or equivalent equipment. The above isolating device shall
be activated by reliable sensors that detect loss of utility system AC voltage, low or high frequency,
generator overload or other suitable input from Alliant Energy’s distribution system.
Static Inverters and Converters shall have a UL 1741 listing or accepted Nationally Recognized
Testing Laboratories (NRTL) with an Output Type of “Utility Interactive” or an Output Code of
“UI” (See Technical Guidelines and Distributed Generation Requirements).
513.
SYNCHRONIZING - (see Technical Guidelines referred to in Section 506)
514. TRANSFORMATION
In the event the voltage or frequency supplied by the customer’s generator is different than Alliant
Energy’s available standard frequency and or voltage (refer to Chapter 1, Section 108), the customer
shall install, own and maintain all transformers and associated equipment necessary for the voltage
transformation.
Page52
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
515. POWER FACTOR AND CAPACITORS
Some types of generators cannot supply the customer’s lagging power factor loads such as motors,
etc. The customer is responsible for supplying any power factor correction, such as capacitors,
which may be required during the generator operation.
The power factor of a generator shall not be less than required. The customer is responsible for
providing power factor correction for generation below the requirement value (see Technical
Guidelines and Distributed Generation Contract Requirements).
516.
OPTIONAL STANDBY GENERATOR USED WITH PARALLEL
GENERATION
Where a customer operates both a parallel generator and an optional standby generator, the standby
generator must be installed in accordance with the connection and transfer switch requirements of
ESR Chapter 12.
517. ADDITIONAL REQUIREMENTS
A. Permanent labeling is required; Labeling shall be rigid engraved plastic or an approved engraved
self-sticking brass or aluminum. All labels must be easily readable from a distance.
At meter location
At DG disconnect
B. A device capable of disconnecting DG facilities from the electric distribution system shall be
located within 10 feet of the utility electric meter on residential and single building structures.
Non-residential facilities with multiple buildings must install disconnect within 30 feet line of
sight from electric meter. The disconnection device shall open with a visual break and be
capable of disconnecting distributed generation. The switch shall be mounted at a height
between 30 and 72 inches.
C. Services with round meter sockets may require additional work or upgrading. Contact Alliant
Energy if you have this type of meter socket.
518. DRAWINGS
Sample diagrams and metering drawings are shown in Sections 519 - 530.
Consult Alliant Energy for larger installations or drawings not shown.
Page53
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
519.
Issued Jan 2016
NET-METERED SELF-CONTAINED DISTRIBUTED GENERATION
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 1-PHASE 120/208 VOLT
Item
No.
Description
1
2
3
4
5
Underground service cable
Meter (outside)
Customer service entrance panel (outside or inside)
Rigid conduit
Approved meter socket - do not modify lugs
(see note #6 below)
Concrete sleeve
Conduit expansion joint
Conduit insulating bushing
Conduit straps
Grounding in accordance with the NEC (see Chapter 14)
6
7
8
9
10
Furnished &
Installed By
Utility
Furnished &
Installed By
Customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
7.
Switch” by means of a permanently attached sign with clearly visible letters. The applicant shall
provide and post its procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, system must be
capable of disconnecting and de-energizing the residual voltage in DG facility.
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on, or in, any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
Modification to lugs in meter socket is not allowed and may violate UL rating.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page54
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
519.
Issued Jan 2016
NET-METERED SELF-CONTAINED DISTRIBUTED GENERATION WHERE
SERVICE PLUS GENERATION DOES NOT EXCEED 120% OF SERVICE
PANEL BUSS CAPACITY
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 1-PHASE 120/208 VOLT
Service plus DG is limited to 120% of bus capacity per NEC 705 All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page55
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
519A. NET-METERED SELF-CONTAINED DISTRIBUTED GENERATION –
CONTINUED
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 1-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page56
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
519B. NET-METERED SELF-CONTAINED DISTRIBUTED GENERATION –
CONTINUED
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 1-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page57
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
520.
Issued Jan 2016
NET-METERED DISTRIBUTED GENERATION FIELD BUILT STRUCTURE
100 - 300AMP – 1-PHASE 120/240 VOLT
100 - 300AMP – 3-PHASE 120/208 VOLT
Item
No.
Description
1
2
3
4
Service drop
Meter
Field built structure
Approved meter socket - do not modify lugs
(see note #6 below)
Treated 35’/5 pole
Grounding in accordance with the NEC (see Chapter 14)
Service entrance
Overhead service conduit with weather head
Feeder panels – as needed
Expansion sleeves – as needed
Conduit expansion joint
5
6
7
8
9
10
12
Furnished &
installed by
utility
X
X
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
7.
8.
Switch” by means of a permanently attached sign with clearly visible letters. The applicant shall
provide and post the procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility.
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on, or in, any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
Modification to lugs in meter socket is not allowed and may violate UL rating.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page58
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
520.
Issued Jan 2016
NET-METERED DISTRIBUTED GENERATION FIELD BUILT STRUCTURE
- CONTINUED
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 3-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page59
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
521.
Issued Jan 2016
DUAL-METERED FARM YARD-POLE DISTRIBUTED GENERATION
100 - 300AMP – 1-PHASE 120/240 VOLT
100 - 300AMP – 3-PHASE 120/208 VOLT
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
Service drop
Service connectors
Meters
Pole - treated 35' class 5 minimum
Down guy, anchor and guy guard
Service entrance
Overhead service conduit
Weatherhead
Approved duplex meter socket
Grounding in accordance with the NEC (see Chapter 14)
Feeder conduit
Customer’s feeder conductors
Distributed Generation disconnect (see note 3 below)
Furnished &
installed by
utility
X
X
X
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Customer shall provide 36 inch leads at the weather head.
2. If large equipment is to be driven under the service drop, see NESC 232.1. Drop shall be a
3.
4.
5.
6.
7.
8.
9.
10.
minimum of 18 feet above ground at the lowest point.
The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
Switch” by means of a permanently attached sign with clearly visible and letters. The applicant
shall provide and post the procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on, or in, any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
Modification to lugs in meter socket is not allowed and may violate UL rating
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page60
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
521.
Issued Jan 2016
DUAL-METERED FARM YARD-POLE DISTRIBUTED GENERATION –
CONTINUED
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 3-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page61
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
522.
Issued Jan 2016
NET-METERED FARM YARD-POLE DISTRIBUTED GENERATION
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 3-PHASE 120/208 VOLT
Item
No.
Description
1
2
3
4
5
6
7
8
9
Service drop
Service connectors
Meter
Pole - treated 35' class 5 minimum
Down guy, anchor and guy guard
Service entrance
Overhead service conduit
Weatherhead
Approved meter socket - do not modify lugs
(see note #6 below)
Grounding in accordance with the NEC (see Chapter 14)
Feeder conduit
Customer’s feeder conductors
Distributed Generation Disconnect
10
11
12
13
Furnished &
installed by
utility
X
X
X
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
7.
8.
Switch” by means of a permanently attached sign with clearly visible and letters. The applicant
shall provide and post the procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility.
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on or in any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
Modification to lugs in meter socket is not allowed and may violate UL rating.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page62
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
522.
Issued Jan 2016
NET-METERED FARM YARD-POLE DISTRIBUTED GENERATION –
CONTINUED
100 – 300AMP 1-PHASE 120/240 VOLT
100 – 300AMP 3-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page63
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
523.
Issued Jan 2016
GENERAL SERVICE INSTRUMENT METERED DISTRIBUTED
GENERATION WITH SELF-CONTAINED METERING FOR DISTRIBUTED
GENERATION
301 – 800 AMP 1-PHASE 120/240 VOLT
301 – 800 AMP 3-PHASE 120/208 VOLT
301 – 800 AMP 3-PHASE 277/480 VOLT
Item
No.
Description
1
2
3
Meter
Approved meter socket
Approved general service CT cabinet - do not modify lugs (see
note #6 below)
Junction box
Approved DG meter socket
Grounding in accordance with the NEC (see Chapter 14)
DG Disconnect
Overhead conduit
Optional underground feed
Expansion joint
4
5
6
7
8
9
10
Furnished &
installed by
utility
X
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
7.
8.
Switch” by means of a permanently attached sign with clearly visible letters. The applicant shall
provide and post the procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on or in any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
Modification to lugs in meter socket or CT cabinet is not allowed and may violate UL rating.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page64
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
523.
Issued Jan 2016
GENERAL SERVICE INSTRUMENT METERED DISTRIBUTED
GENERATIONWITH 0 - 200 AMP SELF-CONTAINED DISTRIBUTED
GENERATION – CONTINUED
301 – 800 AMP 1-PHASE 120/240 VOLT
301 – 800 AMP 3-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page65
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
523A. GENERAL SERVICE INSTRUMENT METERED DISTRIBUTED
GENERATION WITH SELF- CONTAINED DG WHERE SERVICE PLUS
GENERATION DOES NOT EXCEED 120% OF SERVICE PANEL BUSS
CAPACITY
301 – 800 AMP 1-PHASE 120/240 VOLT
301 – 800 AMP 3-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page66
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
523B. GENERAL SERVICE INSTRUMENT METERED DISTRIBUTED
GENERATION WITH SELF-CONTAINED DG WHERE SERVICE PLUS
GENERATION EXCEEDS 120% OF SERVICE PANEL BUSS CAPACITY
301 – 800 AMP 1-PHASE 120/240 VOLT
301 – 800 AMP 3-PHASE 120/208 VOLT
When existing CT cabinet does not
accommodate the addition of DG
conductors, a bussed gutter is required.
DO NOT modify CT cabinet or lug
terminals – see notes Section 523.
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page67
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
524.
Issued Jan 2016
GENERAL SERVICE INSTRUMENT METERED DISTRIBUTED
GENERATION WITH 0 - 300AMP SELF - CONTAINED DISTRIBUTED
GENERATION
100 – 800 AMP 3-PHASE 277/480 VOLT
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
Meter
Approved meter socket
Approved general service CT cabinet
Junction box
Approved DG meter socket
Grounding in accordance with the NEC (see Chapter 14)
DG service entrance
Overhead conduit
Optional underground feed
Expansion joint
DG or load break disconnect
Furnished &
installed by
utility
X
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
7.
Switch” by means of a permanently attached sign with clearly visible letters. The applicant shall
provide and post its procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility.
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on or in any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page68
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
524.
Issued Jan 2016
GENERAL SERVICE INSTRUMENT METERED DISTRIBUTED
GENERATION WITH 0 - 300 AMP SELF-CONTAINED DISTRIBUTED CONTINUED
300 - 800 AMP 3-PHASE 277/480 VOLT
524A. NET-METERED SELF-CONTAINED WHERE SERVICE PLUS
DISTRIBUTED GENERATION DOES NOT EXCEED 120% OF SERVICE
PANEL BUSS CAPACITY
100 - 200 AMP 3-PHASE 277/480 VOLT (see notes on previous page)
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page69
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
525.
Issued Jan 2016
DUPLEX MANUFACTURED PEDESTAL DISTRIBUTED GENERATION
100 – 300 AMPS 1-PHASE 120/240 VOLT
100 – 300 AMPS 3-PHASE 120/208 VOLT
Item
No.
Description
1
2
3
4
5
6
Meter
Underground service lateral
Approved duplex meter enclosure
Service entrance
DG disconnect
Grounding in accordance with the NEC (see Chapter 14)
Furnished &
installed by
utility
X
X
Furnished &
installed by
customer
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
Switch” by means of a permanently attached sign with clearly visible and permanent letters. The
applicant shall provide and post its procedure for disconnecting the DG facility next to the
switch (NEC 705.22).
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility.
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on or in any metering device. Intersystem
bonding may only be done at the ground rod(s) on the grounding, electrode conductor or
ground bus in customers main disconnect.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page70
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
525.
Issued Jan 2016
DUPLEX MANUFACTURED PEDESTAL DISTRIBUTED GENERATION –
CONTINUED
100 – 300 AMPS 1-PHASE 120/240 VOLT
100 – 300 AMPS 3-PHASE 120/208 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page71
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
526.
Issued Jan 2016
DUAL INSTRUMENT TRANSFOMER DISTRIBUTED GENERATION
OPTIONAL - WALL MOUTED, PAD MOUNTED OR ON FIELD BUILT
301 – 800 AMP 1-PHASE 120/240 VOLT
301 – 800 AMP 3-PHASE 120/208 VOLT
301 – 800 AMP 3-PHASE 277/480 VOLT
Item
No.
Description
Furnished &
installed by
utility
1
2
3
4
5
6
7
8
9
Meter
Approved meter socket
Approved DG meter socket
DG service entrance
General service CT cabinet
Approved termination cabinet
DG CT cabinet
Grounding in accordance with the NEC (see Chapter 14)
Optional equipment pad
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
NOTES:
1. The applicant shall label the interconnection disconnect switch “Interconnection Disconnect
2.
3.
4.
5.
6.
7.
Switch” by means of a permanently attached sign with clearly visible letters. The applicant shall
provide and post its procedure for disconnecting the DG facility next to the switch.
DG disconnect must have a visible break and able to be locked open. Or, equipment must be
capable of disconnecting and de-energizing the residual voltage in DG facility.
DG disconnect and its location shall conform to technical guidelines and state requirements.
Consult with Alliant Energy for details and specifications.
Communication intersystem bonding is not allowed on or in any metering device.
Intersystem bonding may only be done at the ground rod(s), on the Grounding Electrode
Conductor or ground bus in customers main disconnect.
The building or structure shall have a permanent plaque or directory within 10 feet of the meter
that complies with the NEC 705.10 and NEC 690.56(B) requirements.
Labeling at the meter socket shall indicate dual source, the voltage (example: 120/240; 120/208
or 277/480), maximum current and maximum power (kW) of solar/ DG source. Minimum ¼
inch block lettering required on Alliant Energy approved label (see section 517).
Page72
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
526.
Issued Jan 2016
DUAL INSTRUMENT TRANSFOMER DISTRIBUTED GENERATION
OPTIONAL - WALL MOUTED, PAD MOUNTED OR ON FIELD BUILT
CONTINUED
301 – 800 AMP 1-PHASE 120/240 VOLT
301 – 800 AMP 3-PHASE 120/208 VOLT
301 – 800 AMP 3-PHASE 277/480 VOLT
All DG equipment must be permanently labeled according to NEC 705.10.
Alliant Energy requires self-sticking brass or rigid plastic permanent label at meter socket for multiple or net metering.
Page73
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
527.
Issued Jan 2016
PRIMARY METERED, PAD MOUNT SWITCHGEAR, DISTRIBUTED
GENERATION- (Wisconsin Only)
Primary switchgear with
net-metering for remote building
Building with photovoltaic panels
with supply from primary service
LEGEND
MAIN = MAIN (Service Entrance)
D
= Disconnect for DG (with visible open and lockable in open position, located outside in a
location readily accessible to the Fire Department.)
M
= Meter
PV
= Photovoltaic panels
PF
= Primary feeder
FD
= Feeder disconnect serving building with photovoltaic panels.
T
= Transformer
P
= Plaque (At the primary switchgear, install plaques at both the meter and at the primary
feeder disconnect serving the building with PV. At the building with photovoltaic panels,
install a plaque adjacent to the photovoltaic disconnect.)
FP
= Building's feeder panel
Page74
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
528.
Issued Jan 2016
DISTRIBUTED GENERATION, BUILDING WITH NET METERING FOR
REMOTE BUILDING WITH BUILDING LOAD FEEDER PANEL
Building with net-metering
for remote building
Building with
photovoltaic panels
LEGEND
SE
= Service entrance
D
= Disconnect for DG (with visible open and lockable in open position)
M
= Meter
PV
= Photovoltaic panels
BJ
= Bonding jumper
P
= Plaque
BLFP = Building load feeder panel
PVFP = Photovoltaic feeder panel
Page75
Chapter 5
ELECTRIC SERVICE RULES
DISTRIBUTED GENERATION
Issued Jan 2016
THIS PAGE INTENTIONALLY LEFT BLANK
Page76
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
CHAPTER 6
ELECRIC SERVICE RULES – SECONDARY METERING
600. METERING FACILITIES
A. Residential customers may use a residential or commercial meter-socket. Commercial, farm and
non-residential customers shall use a commercial meter socket.
B. All residential meter-sockets shall be a ring-less type, equipped with a manual operated bypass
(either horned or lever), have individual covers and be listed in the Electric Service Equipment
(ESE) book.
C. Commercial, farm and non-residential meter-sockets shall be ring-less, equipped with a lever
bypass, locking jaw, have individual covers and be listed in the ESE book.
D. All outdoor service raceway or cable connections to meter-socket bases, meter enclosures,
instrument transformer cabinets and/or switches, shall be minimum NEMA Type 3R.Service
conductor termination fittings in metering equipment shall be screw-tightened construction.
E. Instrument transformer cabinets shall be sized based on the service size and will have factory
bus bars installed to accommodate bar style CT’s to be installed by Alliant Energy. Approved
instrument transformer cabinets shall be listed in the ESE book chapter 2.
F. Short Circuit Current Rating (SCCR), Fault Current Ratings and Amperage Interrupting Current
(AIC) do not apply to meter-sockets if the meter assembly does not contain breakers. If the
meter assembly contains breakers, it must meet the SCCR requirements.
G. Meter sockets are required on all services except special cases outlined in Alliant Energy rates.
601. LOCATION OF METERS
A. Alliant Energy shall pre-approve the location of all meters and metering equipment. The
metering equipment shall be accessible at all times to Alliant Energy representatives.
B. The meter sockets, enclosures or cabinets shall be installed outdoors on a substantial building or
structure.
C. When used for metering purposes, Alliant Energy requires all yard pole meters, field built
metering structures or free standing metering pedestals to be installed so the meter faces an area
(usually a driveway) that will accommodate motor vehicle access to the meter. This will allow the
meter to be read from the vehicle if necessary.
D. If a self-contained meter is installed at a location other than a building, or farm distribution
center, service equipment including over current protection and grounding shall be required at
the metering point.
Page77
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
E. Indoor Locations
Indoor Metering is not allowed where Advanced Metering Infrastructure (AMI) meters are used. 1. Indoor Metering Requirements:
a) Review and approval of the proposed metering site is required prior to construction in
all cases prior to installation. All such requests shall be submitted via variance request, by
Alliant Energy Engineering.
b) New high-rise (6 or more floors) construction, multi-occupancy buildings where 30 or
more meters are required
c) When it is impossible or impractical to install meter bases outside
d) The installation of the electric meter bases shall be in a secure, non-hazardous, accessible
indoor meter or electrical room and shall conform to the requirements on the next page:
6” Clearance must be maintained from all metering equipment.
Page78
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
2. Meter / Electrical Room Requirements:
a) Shall have adequate lighting
b) Shall not be used for any other purpose
c) Shall be located at grade level
d) Shall be secured with an Alliant Energy lock
e) Shall be vented and free from obstructions, abnormal temperatures, corrosive
f)
g)
h)
i)
j)
k)
atmospheres and vibrations
Shall not be used for storage of equipment, cleaning supplies or other materials
Shall have a minimum working space clearance of 78” high by 30” wide by 48” deep in
front of meter bases
The location of the equipment shall be pre-approved by Alliant Energy Engineering and
shall not conflict with national, state or local government code
The customer is responsible for providing and maintaining the approved location for the
installation of metering equipment
Approval to install metering equipment indoors must be granted prior to the placement
of the equipment. It will be the customer’s responsibility to relocate any metering
equipment not installed in an approved location.
Only high-rise buildings may qualify for more than one meter room.
3. Meter Access Requirements:
a) All meters, metering equipment and enclosures shall be readily accessible at all times (24
b)
c)
d)
e)
f)
hours a day) by Alliant Energy personnel for emergencies, meter reading, testing,
inspection and maintenance.
Entry into an electrical room must be through a single doorway that can be opened from
the exterior of the building. No additional entryways are allowed.
Door shall open outward and have minimum dimensions of 36” wide and 6’-6” high.
Neither the ceiling, nor door, nor doorframe shall interfere with the clearances necessary
for the installation or maintenance of service and metering equipment.
The customer is responsible for providing and maintaining an approved location for the
installation of metering equipment.
AMI signal limitation makes certain areas non-acceptable for inside metering.
Page79
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
602.
Issued Jan 2016
METERING INSTALLATIONS
A. Equipment
1. Customer furnishes and installs:
 Meter-sockets
 Ganged meter sets
 Instrument transformer cabinets
 Cable tray or raceway
 Any other related metering equipment
2. Alliant Energy furnishes and installs:
 Meters
 Instrument transformers
 Meter wiring
 Secondary instrument transformer brackets for overhead services
3. The customer shall install the secondary instrument transformer brackets and the 1”
galvanized rigid steel conduit for the meter wiring.
4. The customer shall coordinate the installation so the instrument transformers are mounted
on the bracket prior to the bracket being installed on the meter pole.
B. Meter mounting devices shall be securely fastened to the supporting building or structure with
rust-resistant fasteners. Certain structures may require the addition of a rust-resistant reinforced
mounting surface. Conduits and cables shall not be used to support wall-mounted devices. In no
case may sockets be installed where they will be exposed to mechanical damage, excessive dust,
excessive moisture, corrosive vapors or vibrations.
Page80
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ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
C. Meters and metering devices shall be mounted plumb and at such a height that the center of the
meter is approximately 5’, plus or minus 6”, above the final grade except as follows:
Exception No.1 – Group mounted meter sockets shall be mounted so that meter
centers are between 2’-6” and 6’ above final grade.
Exception No.2 – Outdoor wall-mounted, or free standing meter pedestals shall be
mounted so that meter centers are a minimum of 3’ above final grade.
Exception No.3 – Alliant Energy may grant a variance for height centers are at a
nominal height of 5’ above final grade, plus or minus 6” when in a flood zone.
Exception No.4 – Alliant Energy may grant a variance for height requirements in 100-year
flood plain areas. All such requests shall be submitted via variance request, by Alliant Energy
Engineering before any electrical work has begun. The customer must supply 100-year flood
plain documentation for the location and a design that conforms to OSHA Standards 1926.1052
and 1910.23 with the variance request. Alliant Energy Engineering will not approve any meters
heights beyond 3’ above the 100-year flood plain levels. Required workspace as listed in ESR 605
shall be maintained on this and all meter installations.
D. Customer-owned equipment shall not be installed in meter-sockets, instrument transformers and
termination cabinets that are sealed by Alliant Energy.
603. IDENTIFICATION OF METERS
For multiple metering installations, each meter position shall be marked with the address or unit
number of the location served on the outside of the socket or by the breaker. This marking shall also
be placed on the corresponding distribution panel(s). The external marking shall be a permanent
self-sticking brass or engraved rigid plastic label with minimum ½” block letters or numbers suitable
for the location so as to be considered permanent. A permanent marking shall also be inside the
meter-socket base in a visible location when the cover is removed. Alliant Energy will not install
meters until this requirement is met.
604. METER SEALS
Alliant Energy will seal all meters, meter facilities and points of access to un-metered wiring on the
customer’s premises. All cabinets, conduit fittings and equipment enclosures containing un-metered
conductors shall be made sealable before the service is energized. It is illegal for customers or
contractors to remove meters or seals. Contact Alliant Energy if access to meter-sockets is required.
Violation of this rule could result in immediate disconnection and prosecution.
Page81
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
605. CLEARANCE REQUIREMENTS FOR METERING EQUIPMENT
Alliant Energy requires a minimum of 48 inches working space in front of each meter, meter cabinet
or instrument transformer cabinet.
UNOBSTRUCTED WORK AREA
6” Clearance must be maintained from all metering equipment.
Distance is measured out from the face of the meter or door(s) of the cabinet and a minimum 30
inches wide. A minimum 6 inch vertical and horizontal separation shall be maintained between
metering equipment and other obstructions or non-metering equipment. The space shall be large
enough to allow the cabinet doors to open 90 degrees. The workspace shall be clear from final grade
to at least 6.5 feet above the ground with 8 feet preferred. An area of at least 30 inches in width shall
be provided to access the work area. This work area shall not be used for storage.
606. SEPARATION OF METERED AND UN-METERED CONDUCTORS
A. Metered circuit wires shall not be enclosed with un-metered circuit wires in the same raceway or
cable trough, except as required in sealed meter equipment assemblies: meter sockets, meter
pedestals and instrument transformer cabinets.
B. Where metered circuit conductors are run parallel to un-metered service entrance conductors,
they shall be at least 6 inches apart at their termination where not in conduit and exposed, such
as weather heads.
C. The customer shall not install accessible fittings (e.g. LB, box, etc.) in conduit risers that enclose
un-metered service conductors.
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Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
607.
Issued Jan 2016
METER SOCKET REQUIREMENTS
Phase
1
1
3
3
1
1
1
3
3
Wire
Voltage
Max Amps
SELF CONTAINED
3
120/240
300
(1)
200
3
120/208
4
120/208
300
4
277/480
200
INSTRUMENT TRANSFORMER
3
120/240
20
3
120/240
20
3
120/240
100
4
120/208
20
4
277/480
20
Number of
Terminals
4
5
7
7
5(3)
6(2)
5(4)
13
13
SUPERSCRIPT NOTES:
1. Network meters - The fifth terminal shall be installed horizontally in the 9 o’clock position.
Permanent or added fifth position terminals shall be of the screw-in-type unless approved by
Alliant Energy.
2. Used in Iowa for single-phase CT cabinets
3. This 5 terminal meter is for use in Iowa only
4. This 5 terminal meter is for use in Wisconsin only
A. Line and load side conductors entering a meter socket for underground service shall enter and
leave the socket on opposite sides. Line conductors shall enter the socket on the bottom left side
and the load conductors shall leave on the bottom right side of the socket. The center knockout
in the bottom of the 320-amp socket shall only be used when it is necessary to accommodate the
customer with a second conduit. The second conduit may only be installed if the lugs are rated
for a second conductor or there are two sets of lugs. Preapproval from Alliant Energy
Engineering is required to change this orientation.
B. Self-contained meters for single and three-phase services shall not exceed loads of 300 amps.
The maximum allowable amperage rating of 300 amps along with adjustable breaker and fuse or
a combination guarantees the accuracy of the self-contained meters. Service with loads greater
than 300 amps shall use instrument-transformer rated meter.
Page83
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
608. METER SOCKET TYPES
A. 120/240 VOLT SINGLE PHASE - OVERHEAD - SELF CONTAINED
B. 120/240 VOLT SINGLE PHASE - UNDERGROUND - SELF CONTAINED
C. 120/208 VOLT SINGLE PHASE (NETWORK) - OVERHEAD - SELF CONTAINED
Page84
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
D. THREE PHASE - 4-WIRE - OH SELF CONTAINED
E. THREE PHASE - 4-WIRE - UG SELF CONTAINED
Page85
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
609.
Issued Jan 2016
277/480 VOLT, 3-PHASE, UP TO 200 AMPS – OH & UG – SELF CONTAINED –
LIMITED TO 10,000 AMPS MAX AVAILABLE FAULT CURRENT.
Item
No.
Description
1
2
3
4
Service lateral
5
6
7
8
9
10
11
Furnished &
Installed By
Utility
X
X
Socket type meter
Rigid conduit
Individual load break disconnect switch with means of locking
open and closed that is sealable (for utility use only)
Approved meter socket
Ground in accordance with the NEC (see Chapter 14)
Service lateral rigid conduit
Service entrance panel
Expansion joint
Concrete sleeve (if required)
Termination cabinet – See ESE section E211
Furnished &
Installed By
Customer
X
X
X
X
X
X
X
X
X
NOTES:
1. Contractor to provide neutral kit for disconnect.
2. Sequence Switch-Meter-Switch-Fuse.
3. See Section 408, for conduit information & bending radius.
4. Not for Farm Irrigation Services, see chapter 8.
5. NEC requires load break switch to be rated for Available Fault Current see 277/480 volt Table
in Section 110.B.
6. Services with an available fault current in excess of 10,000 amps must be instrument (CT & PT)
rated, reference NEC 230-82.
7. Self‐contained 277/480 meter service applications are limited to a single service and have a
maximum transformer size of 150 kVA OH unit and 3oo KVA from a pad-mounted
transformer.
Page86
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
609A. 277/480 VOLT, THREE-PHASE, UP TO 200 AMPS – OH – SELF CONTAINED –
LIMITED TO 10,000 AMPS MAX AVAILABLE FAULT CURRENT
609B. 277/480 VOLT, THREE-PHASE, UP TO 200 AMPS – UG – SELF CONTAINED –
LIMITED TO 10,000 AMPS MAX AVAILABLE FAULT CURRENT
Page87
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
610. SELF CONTAINED MULTIPLE GROUP METERING (Meter-pack) &
MODULAR (2 OR MORE COMPONENTS WITH MULTIPLE METER
POSITIONS) UP TO 200 AMPS PER SOCKET, 250 VOLTS MAX
Item
No.
Description
1
Underground conduit
2
Socket type meter
Expansion sleeve
X
Underground service lateral in customer provided conduit
X
3
4
5
6
Furnished &
Installed By
Utility
Furnished &
Installed By
Customer
X
X
X
X
Multiple metering equipment
Termination area
NOTES:
1. Service disconnect switches shall be located adjacent to the meter or grouped in an integral
2.
3.
4.
5.
6.
factory manufactured section of the multiple metering equipment.
Meters shall be arranged such that there is a logical left to right and top to bottom numbering
sequence.
When requested by Alliant Energy, the customer shall furnish Alliant Energy with a diagram of
the ganged meter socket assembly with each unit clearly identified and a floor plan of the facility
with corresponding units clearly identified.
The normal sequence shall be meter-switch-fuse for six or less meters. With special approval
from Alliant Energy engineering and only on factory bussed equipment, a service disconnect
may be installed ahead of the metering for 2 through 6 meter installations. This sequence will
then be switch-fuse-meter-switch-fuse. For 7 or more meters the sequence shall be switchfuse-meter-switch-fuse.
For units larger than 200 amps per meter position consult Alliant Energy.
Alliant Energy will not terminate on a customer's circuit breaker.
Page88
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
610A. SELF CONTAINED MULTIPLE METERING GROUP & MODULAR (2 OR
MORE METERS) UP TO 200 AMPS PER SOCKET, 250 VOLTS MAXIMUM —
CONTINUED.
MULTIPLE METERING
HORIZONTAL GROUP METERS - 2 TO 6 METERS
Figure 613 AA
NOTES:
1. Refer to sections E107 & E110 of the ESE book.
2. Maximum of 2 positions for 5 Terminal
3. All customer equipment shown in this drawing must be listed in the current ESE book.
4. This Group Metering unit does not require an approved Alliant Energy termination cabinet for
termination of Alliant Energy conductors
Page89
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
610B. SELF CONTAINED MULTIPLE METERING GROUP (2 OR MORE METERS)
UP TO 200 AMPS PER SOCKET, 250 VOLTS MAX – CONTINUED.
MULTIPLE METERING
METER PAK - 2-6 METERS
NOTES:
1. Refer to sections E108 & E111 of the ESE book
2. All customer equipment shown in this drawing must be listed in the current ESE book.
3. This Multiple Meter Pak unit does not require an approved Alliant Energy termination cabinet
for termination of Alliant Energy conductors.
4. Multi-meter minimum height is 2’-6” and maximum height is 6’.
Page90
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
610C. MODULAR METERING (2 OR MORE METERS) UP TO 200 AMPS PER
SOCKET, 250 VOLTS MAX – CONTINUED
MODULAR MULTIPLE METERING
HORIZONTAL BUSSED
Figure 613-AC
NOTES:
1. Refer to sections E109 and E112 of the ESE book
2. All customer equipment shown in this drawing must be listed in the current ESE book.
3. This Modular Multiple Metering unit does require an approved Alliant Energy termination
cabinet as listed in the ESE book for termination of Alliant Energy conductors.
4. The spacer section as shown in the above drawing is required whenever the 6 inch clearance
from the meter glass to a cabinet cannot be obtained.
5. Multi-meter minimum height is 2’ 6” and a maximum height is 6’.
Page91
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
611.
Issued Jan 2016
SELF CONTAINED MULTIPLE METERING GROUP & MODULAR (2 OR
MORE METERS) UP TO 200 AMPS PER SOCKET, 250 VOLTS MAXIMUM
Service entrance panels shall have a minimum distance for "H" from the edge of the cable entry
opening, to the set screw connector, as shown in the table below. This area is for wire training space.
No accessible fittings are allowed in conduit entry.
Information in this table to be used for underground services only
Switch Size
In Amps
Lug Size
Aluminum
“H”
Minimum Distance
200
#4/0 – 350 KCM
20”
Number of
Lugs per
Phase
1
300
#4/0 – 350 KCM
20”
1
400
#4/0 – 500 KCM
20”
2
600
#4/0 – 500 KCM
20”
2
800
#4/0 – 500 KCM
20”
3
1000
#4/0 – 500 KCM
20”
4
1200
#4/0 – 500 KCM
20”
5
1600
500 – 1000 KCM
26”
4
2000
500 – 1000 KCM
26”
5
2500
500 – 1000 KCM
26”
7
3000
500 – 1000 KCM
26”
8
Note: 500 KCM Conductors are for maintenance use only
Page92
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
612. METER SHIELD
The customer is responsible for protecting Alliant Energy’s meter(s) from damage caused by falling,
ice, snow or other objects. If protection is not provided for Alliant Energy’s meter by adequate roof
overhang, the customer shall construct a protective shield, or the meter location shall be moved to a
safe area. The customer will be charged for meter replacement if damage occurs. An adequate roof
overhang shall extend a minimum of 18” out from the face of the wall to which the meter is
mounted.
Perspective View
1/8" Sheet Steel
1/8" Dia. Galv. Bolts
18"
Steel
Plate
12" to 18"
12"
Meter
Wall Section
Customer's
Meter
Socket (s)
Front View
NOTES:
1. Steel to be primed and painted with rust-resistant paint.
2. Shield shall be capable of supporting 50 pounds.
3. Shield may be constructed of steel, treated wood or masonry. Thin sheet metal (tin) is not
acceptable.
4. Shield to be so located as to not be a “head bumping” hazard.
5. Width of shield may vary depending on the number of meters being protected.
Page93
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
613. OUTDOOR FREE STANDING (Field-Built) METER STRUCTURES
A. Field built pedestals are limited to - 1200 Amp Maximum
Alliant Energy engineering approval is required for use.
B. Wood field built pedestals shall have a minimum of two 6” x 6” wood posts and 2” x 6” planks
that are commercially treated against decay. The posts shall be buried a minimum of 4 feet deep,
plumb and set in concrete the full depth. The planks shall be level and fastened with galvanized
hardware (bolts, washers, nuts, etc.). The customer is responsible for the maintenance of the
structure. The standard width is 24 to 60 inches.
C. All service equipment shall be waterproof, lockable and listed by an approved testing agency for
service entrance use.
WOOD CONSTRUCTION
Page94
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
STEEL POST CONSTRUCTION
NOTES:
1. Metal posts are not allowed to serve as equipment grounding conductor.
2. Unistrut shall not extend beyond post & must have safety end caps for safety reasons.
3. All metallic parts shall be bonded according to the NEC.
4. Grounding shall conform to NEC and section 436-439.
Page95
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
614. INSTRUMENT TRANSFORMER INSTALLATIONS
A. For new services greater than 300 amps, all farm irrigation services and metering instrument
transformers (current and/or voltage) shall be used with instrument rated meters to measure
power consumption.
NOTE: Refer to Sections 609 for non-irrigation, 277/480 volt services,
200 amps or less, which may utilize self-contained metering.
1. In Iowa, the instrument rated meter socket will be provided as wired by the factory and
installed by the customer.
2. In Wisconsin, the customer will provide and install the meter socket. The test switch and
wiring will be installed by Alliant Energy metering personnel.
B. When an Instrument Transformer Cabinet is required, the following conditions below will apply:
Also see sections 615, 616 and 617.
1. The customer shall provide and install an Alliant Energy approved bussed cabinet for the
instrument transformers. PT’s and CT’s will be provided and installed by Alliant Energy.
Alliant Energy approved cabinets are listed in the ESE book, chapter 2.
2. The customer will install a 1 inch rigid galvanized steel (RGS) conduit for metering
conductors between the meter cabinet and the meter socket with a minimum separation of 6
inches. This metering conduit shall not enter the cabinet in a wire-way area provided for load
conductors to exit the cabinet.
3. The customer shall mount the metering cabinets outdoors at the specified height above
finished grade and at locations specified by Alliant Energy Engineering.
4. All free-standing cabinets shall be mounted on a UL approved manufacturer’s base a
minimum of 9 inches high.
5. Alliant Energy will not terminate conductors or meter secondary services in a customer’s
building.
C. When an Instrument Transformers Cabinet is not required, the following conditions will apply:
Also see section 805.
1. PT’s, CT’s and the mounting bracket will be provided by Alliant Energy and installed by the
customer.
2. The customer will install a 1 inch rigid galvanized steel (RGS) conduit for metering
conductors between the meter transformers and the meter-socket
D. Installations above 480 volts.
1. The customer shall contact Alliant Energy Engineering concerning all planned installations
with service voltages above 480 volts.
Page96
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
E. Service Configuration
1. Underground Services, Bottom-In / Top-Out
Underground feed installations (Alliant Energy conductors) shall enter and terminate on the
bottom lugs of all cabinets. The customer’s load side conductors shall terminate on the top
lugs and exit above the load side lugs.
2. Underground Services, Bottom-In / Bottom-Out
Underground feed installations (Alliant Energy conductors) shall enter and terminate on the
bottom lugs of all Current Transformer (CT) cabinets. Load side conductors shall terminate
on the top lugs of the CT cabinet and be routed either behind the CT bus work or to the left
or right of the CT bus work down to the bottom of the cabinet to the load side conduits. If
the cabinet is equipped with an external side gutter (pull box) or other external raceway, the
load conductors shall be routed through this external side gutter (pull box) or raceway. Load
side conductors exiting through an external gutter shall exit above the load side lugs. If the
cabinet has internally mounted PT’s the exiting load side conductors shall be installed behind
the PT’s pan.
3. Underground Services/Pad-Mount CT Cabinets, Bottom-In / Bottom-Out
Metering Transformer Cabinets meeting the specifications for Bottom-In / Bottom-Out
may be used in a free-standing, pad-mount configuration providing the following
requirements are met:
a) The cabinet shall be approved “Bottom-In / Bottom-Out” as listed in the ESE book.
b) The cabinet shall have an Alliant Energy approved pedestal base mounted to the bottom
in order to bring the cabinet 9”-10” above the pad or if incorporated into the design, the
bottom of the access door shall be a minimum of 9 inches above grade.
c) The entire assembly will be bolted to a suitable concrete pad, providing stable support
and facilitating the required conduit for entrance and exit. This concrete pad may be
poured adjacent to or as one pad according to Alliant Energy Engineering requirements.
d) An approved meter socket, as listed in chapter 1 of the ESE book shall be mounted only
on the side of all pad mounted cabinets at a height consistent with the requirements in
this book and the door shall not block or impede meter socket access at any time.
e) In the event that customer requests and Alliant Energy grants approval to reverse
conductors (i.e., customer conductors on bottom and utilities wires on top), permanent
signage shall note this change both outside and inside the cabinet. Any additional cost
will be borne by the customer.
Page97
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
Note:
Lugs are designed for a single conductor unless specifically labeled for multi-conductor
(NEC 110.14A)
4. Overhead Services, Top-In / Bottom-Out
Top feed installations can only be utilized for Overhead Services with a maximum rating of
1200 amps. Load side conductors must exit below the load side lugs.
The “H” dimension does not apply to this configuration, because the customer owns and
installs all the conductors.
5. Overhead Services, Top-In / Top-Out
Top feed installations can only be utilized for Overhead Services with a maximum rating of
1200 amps. Load side conductors must be isolated from the line side.
The “H” dimension does not apply to this configuration, because the customer owns and
installs all the conductors.
Page98
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
615.
Issued Jan 2016
WALL MOUNTED OUTDOOR METERING TRANSFORMER CABINET
OVERHEAD SERVICE.
301 - 600 AMP – 120/240 VOLTS – SINGLE-PHASE
301 - 1200 AMP – 120/208 VOLTS – THREE-PHASE
100 - 600 AMP – 277/480 VOLTS – THREE-PHASE
Item
No.
Description
1
2
3
4
5
Socket type meter
Metering cable
Instrument transformers in cabinet
Approved meter socket
1” rigid galv. steel conduit. Maximum allowable conduit
run is 50’ with a total of 2-90° bends. Minimum 6” space
is required between cabinet and socket.
Metering transformer cabinet
Rigid galv. steel conduit
Service conductors
Service conduit(s) or trough
6
7
8
9
Page99
Furnished &
Installed by
Utility
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
616.
Issued Jan 2016
WALL MOUNTED METERING TRANSFORMER CABINET.
UNDERGROUND SERVICE
301 - 400 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
301 - 600 AMP – 120/240 VOLTS –SINGLE-PHASE (FROM PAD XFMR)
301 - 3000 AMP – 120/208 VOLTS – THREE-PHASE (FROM PAD XFMR)
100 - 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
100 - 3000 AMP – 277/480 VOLTS – THREE-PHASE (FROM PAD XFMR)
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
Instrument transformers in cabinet
Service lateral
Meter
Instrument transformer cabinet
Rigid conduit
Conduit straps
Expansion joint
Approved meter socket
Insulated bushing
Ground in accordance with the NEC (see Chapter 14)
Sleeve if conduit passes through concrete or asphalt
1” rigid galvanized steel conduit
Metering cable
Furnished &
Installed by
Utility
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. The customer shall consult Alliant Energy before this installation is planned or started.
2. A minimum clear space of 4 feet shall be provided in front of the metering transformer cabinet
to allow for door opening & working space.
3. CT cabinet door shall not block or impede meter socket access at any time (open or closed).
Page100
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
616.
Issued Jan 2016
WALL MOUNTED OUTDOOR METERING TRANSFORMER CABINET.
UNDERGROUND SERVICE - CONTINUED
301 - 400 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
301 - 600 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM PAD XFMR)
301 - 3000 AMP – 120/208 VOLTS – THREE-PHASE (FROM PAD XFMR)
100 - 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
100 - 3000 AMP – 277/480 VOLTS – THREE-PHASE (FROM PAD XFMR)
Page101
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
617.
Issued Jan 2016
PAD-MOUNTED OUTDOOR METERING, INSTRUMENT TRANSFORMER
CABINET, UNDERGROUND SERVICE
301 - 400 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
301 - 600 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM PAD XFMR)
301 - 3000 AMP – 120/208 VOLTS – THREE-PHASE (FROM PAD XFMR)
100 - 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
100 - 3000 AMP – 277/480 VOLTS – THREE-PHASE (FROM PAD XFMR)
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
CT metering
Service lateral
Meter
Alliant Energy approved CT cabinet
Rigid conduit elbows
Rigid conduit
Conduit sleeve through concrete
Concrete foundation
Insulating bushing
Approved meter socket
CT cabinet base
Furnished &
Installed by
Utility
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
NOTES:
1. The customer shall consult with Alliant Energy before this installation is planned or started.
2. All cables shall enter and leave the cabinet through the window in the pad, except when the
cabinet is mounted immediately adjacent to a building wall or attached to the building wall and
the customer’s conduit exit the cabinet above the load side lugs directly through the wall into
building.
3. Customer may mount meter socket on the outside of the cabinet, not on door.
4. CT cabinet door shall not block or impede meter socket access at any time (open or closed).
5. A minimum clear space of 4 feet shall be provided in front of the metering transformer cabinet
to allow for door opening.
Page102
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
617.
Issued Jan 2016
PAD-MOUNTED OUTDOOR METERING, INSTRUMENT TRANSFORMER
CABINET, UNDERGROUND SERVICE – CONTINUED.
301 - 400 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
301 - 600 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM PAD XFMR)
301 - 3000 AMP – 120/208 VOLTS – THREE-PHASE (FROM PAD XFMR)
100 - 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
100 - 3000 AMP – 277/480 VOLTS – THREE-PHASE (FROM PAD XFMR)
Page103
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
618.
Issued Jan 2016
MODULAR METERING WHERE ALLIANT ENERGY TERMINATES IN AN
ALLIANT ENERGY APPROVED TERMINATION CABINET AND THE
CUSTOMER EXTENDS SERVICE LATERAL CONDUCTORS TO A
CUSTOMER TERMINATION BOX (LESS THAN 6 METERS) OR A MAIN
BREAKER (MORE THAN 6 METERS).
301 - 400 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
301 - 600 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM PAD XFMR)
301 - 3000 AMP – 120/208 VOLTS – THREE-PHASE (FROM PAD XFMR)
100 - 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
100 - 3000 AMP – 277/480 VOLTS – THREE-PHASE (FROM PAD XFMR
Item
No.
Description
Furnished &
Installed by
Utility
1
2
3
4
5
6
7
8
9
10
11
12
Underground conduit
Socket type meter
Overhead service conductors riser
Underground service lateral in customer provided conduit
Multiple metering equipment
Termination Area
Ground in accordance with the NEC (see Chapter 14)
Service disconnect
Metering conduit (1” rigid steel)
Expansion sleeve
Metering cable
Current transformer cabinet
Page104
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
X
X
X
X
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
619.
Issued Jan 2016
MODULAR METERING WHERE ALLIANT ENERGY TERMINATES IN AN
ALLIANT ENERGY APPROVED TERMINATION CABINET AND THE
CUSTOMER EXTENDS SERVICE LATERAL CONDUCTORS TO A
CUSTOMER TERMINATION BOX (LESS THAN 6 METERS) OR A MAIN
BREAKER (MORE THAN 6 METERS) - CONTINUED
301 - 400 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
301 - 600 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM PAD XFMR)
301 - 3000 AMP – 120/208 VOLTS – THREE-PHASE (FROM PAD XFMR)
100 - 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
100 - 3000 AMP – 277/480 VOLTS – THREE-PHASE (FROM PAD XFMR)
NOTES:
1. All underground service to horizontally bussed modular meter installations utilizing (Cutler
2.
3.
4.
5.
6.
7.
Hammer, Schneider Electric Square-D and Siemens) will be serviced as shown in Figure 619.
The Alliant Energy approved termination box will not be required for overhead service to this
type of modular metering installation.
Service disconnect switches shall be located adjacent to the meter or grouped in an integral
factory manufactured section of the multiple metering equipment.
Meters shall be arranged such that there is a logical left to right and top to bottom numbering
sequence.
When requested by Alliant Energy, the customer shall furnish Alliant Energy with a diagram of
the ganged meter socket assembly with each unit clearly identified and a floor plan of the facility
with corresponding units clearly identified.
The normal sequence shall be meter-switch-fuse for 6 or less meters. With special approval
from Alliant Energy engineering and only on factory bussed equipment, a service disconnect
may be installed ahead of the metering for 2 through 6 meter installations. This sequence will
then be switch-fuse-meter-switch-fuse. For 7 or more meters the sequence shall be switchfuse-meter-switch-fuse. For 480/277 self-contained shall have a sequence of switch-fusemeter-switch-fuse.
For units larger than 200 amps per meter position consult Alliant Energy.
Page105
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
619A. COMBINED INSTRUMENT TRANFORMER, SELF CONTAINED,
MULTIPLE METERING, 240 VOLTS AND BELOW, PREBUSSUSED/WIRED
EQUIPMENT – CONTINUED
BUSSED MODULAR METERING
PANELS WITH MAIN BREAKER
MORE THAN 6 DISCONNECTS
Overhead – UP TO 1200 AMPS
Underground – UP TO 3000 AMPS
NOTES:
1. Refer to Sections E109 & E112 in the ESE book.
2. All customer equipment shown in this drawing must be listed in the ESE book.
3. Main breaker disconnects must be equipped with separate landing pads with set screw or lay-in
lugs for the termination of Alliant Energy service conductors. See the table at the end of this
section for lug sizes.
4. Optional spacer section is required if meter glass is less than 6” from the side of the disconnect
cabinet.
Page106
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
619B. COMBINED INSTRUMENT TRANFORMER, SELF CONTAINED,
MULTIPLE METERING, 240 VOLTS AND BELOW, PREBUSSUSED/WIRED
EQUIPMENT – CONTINUED
BUSSED COMBINATION
MODULAR METERING PANEL AND METERING TRANSFORMER CABINET
WITH TERMINATION CABINET
2 – 6 DISCONNECTS
NOTES:
1. For Modular Metering information see sections E109 and E112 in the ESE book.
2. For 400 & 600 amp termination box information see sections E211 and E212 in the ESE book.
3. For metering transformer cabinet information see sections E203 - E210 in the ESE book.
4. All customer equipment shown in this drawing must be approved and listed in the ESE book.
Page107
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
619C. COMBINED INSTRUMENT TRANFORMER, SELF CONTAINED,
MULTIPLE METERING, 240 VOLTS AND BELOW, PREBUSSUSED/WIRED
EQUIPMENT – CONTINUED
BUSSED COMBINATION
MODULAR METERING PANELS & METER TRANSFORMER CABINET
WITH MAIN DISCONNECT
MORE THAN 6 DISCONNECT
NOTES:
1. For Modular Metering information see sections E109 and E112 in the ESE book.
2. For metering transformer cabinet information see sections E203-E210 in the ESE book.
3. All customer equipment shown in this drawing must be listed in the ESE book. Main breaker
disconnects must be equipped with separate landing pads with set screw or Lay-in lugs for the
termination of Alliant Energy service conductors. See the table at the end of this section for lug
sizes.
Page108
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
619D. COMBINED INSTRUMENT TRANFORMER, SELF CONTAINED,
MULTIPLE METERING, 240 VOLTS AND BELOW, PREBUSSUSED/WIRED
EQUIPMENT – CONTINUED
CABLE IN – CABLE OUT
MODULAR METERING PANELS & METER TRANSFORMER CABINET
WITH TERMINATION CABINET
NOTES:
1. For Modular Metering information see sections E109 and E112 in the ESE book.
2. Metering transformer cabinets with disconnects 400 amps through 1200 amps are listed in the
ESE book sections E203-E206
3. Metering transformer cabinets without disconnects 400 amps through 3000 amps are listed in
the ESE book sections E203 -E210.
4. All customer equipment shown in this drawing must be listed in Alliant Energy’s ESE book.
Page109
Chapter 6
ELECTRIC SERVICE RULES
SECONDARY METERING
Issued Jan 2016
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Page110
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
Issued Jan 2016
CHAPTER 7
ELECTRIC SERVICE RULES – HUD MANUFACTURED HOMES
700. SCOPE
This chapter covers service requirements for all manufactured homes constructed to the
requirements of the United States Housing and Urban Development (HUD) standards and all
mobile homes. The term MANUFACTURED HOME as used in this chapter shall also apply to all
mobile homes (see definition of mobile home)
701. GENERAL REQUIREMENTS
A. Alliant Energy will provide and install the service cable to individual or group metering points
for manufactured homes. The customer will provide and install the meter socket(s) and service
equipment. Multiple mobile/manufactured homes receiving service at a central location shall
obtain prior approval from Alliant Energy for each installation. Group metering installations
shall follow the same rules as individually metered units.
B. Each meter socket shall be permanently marked or tagged to coincide with each mobile/
manufactured home. Appropriate marking shall consist of a permanent plaque or directory and a
permanent marking shall be indicated inside each meter socket base. Meters shall not be installed
until identification requirements are met. See section 603 for additional information.
C. Minimum rating of a manufactured home service entrance shall be 100 amps. Receptacles shall
have overcurrent protection no greater than their rated capacity.
D. The manufactured home service entrance equipment shall contain a means for serving an
accessory building, structure or additional electrical equipment located outside a
mobile/manufactured home by a fixed wiring method.
E. Manufactured home service entrance equipment is permitted to have additional receptacles for
connection of electrical equipment located outside the home and all such 120-volt, single phase,
15 and 20-amp receptacles shall be protected by listed ground-fault circuit interrupter protection.
F. All branch circuit breakers and feeder breakers shall be connected on the load side of a single
service entrance breaker.
G. A field installed manufactured home service entrance shall be located adjacent to the
manufactured home and not mounted on or in the mobile/manufactured home and not more
than 30 feet from the home. If the manufactured home is placed on a permanent foundation a
conventional service may be installed on the foundation, if the following provisions are met:
1. Service entrance rated equipment is located immediately adjacent to the meter pedestal or be
an integrated part of the meter pedestal.
2. The service entrance shall contain a means for serving an accessory building structure or
additional electrical equipment outside the manufactured home by a fixed wiring method.
3. A four-wire feeder is run from the load side of the service entrance to the electrical panel in
the manufactured home.
Page111
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
702.
Issued Jan 2016
DEFINITIONS
Mobile Homes: NEC 550.2, A factory-assembled structure or structures transportable in one or
more sections that are built on a permanent chassis and designed to be used as a dwelling without a
permanent foundation where connected to the required utilities; these include the plumbing, heating,
air-conditioning and electric systems. (The term “mobile home” refers to factory-built homes that
were produced prior to June 15, 1976; when the HUD requirement went into effect)
Manufactured Homes: These are homes built entirely in the factory under a federal building code
administered by the U.S. Department of Housing and Urban Development (HUD). The Federal
Manufactured Home Construction and Safety Standards (commonly known as the HUD code) went
into effect June 15, 1976. Manufactured homes may be single- or multi-section and are transported
to the site and installed. The federal standards regulate manufactured housing design and
construction, strength and durability, transportability, fire resistance, energy efficiency and quality.
The HUD code also sets performance standards for the heating, plumbing, air-conditioning, thermal
and electrical systems. It is the only federally-regulated national building code. On-site additions,
such as garages, decks and porches, often add to the attractiveness of manufactured homes and must
be built to local, state or regional building codes.
Manufactured homes will have a plate (sticker) located on the end of each transportable section:
If the manufactured home is built to NEC 550.32A there will be a sticker located near the panel
indicating that a four-wire feeder is required, these homes will be provided service according to this
chapter:
Page112
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
Issued Jan 2016
If the manufactured home is built to meet the conditions of NEC 550.32B, the manufacturer will
place a sticker on the outside of the home near the service panel indicating that grounding is
required prior to connection of service, these homes will be provided service according to chapters 1
through 6:
Modular Homes: These factory-built homes are built to the state, local or regional code where the
home will be located. Modules are transported to the site and installed. These homes will have a
state sticker indicating that it has been constructed to the applicable state code requirements. (See
stickers below)
Panelized Homes: These are factory-built homes in which panels - a whole wall with windows,
doors, wiring and outside siding - are transported to the site and assembled. The homes must meet
state or local building codes where they are sited.
Pre-Cut Homes: This is the name for factory-built housing in which building materials are factorycut to design specifications, transported to the site and assembled. Pre-cut homes include kit, log
and dome homes. These homes must meet local, state or regional building codes.
Modular homes, panelized homes and pre-cut homes will be supplied electric service
according to chapters 1 through 6.
Page113
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
Issued Jan 2016
703. MOBILE / MANUFACTURED HOME COURTS.
A. A mobile/manufactured home court is defined as a contiguous parcel of land that is used for the
accommodation of occupied manufactured homes. Underground distribution systems in a new
court will be installed and owned by Alliant Energy according to existing extension rules and
Electric Service Rules.
B. For distribution system rebuilds, any relocation of service drops, service laterals or meter
locations, requested by the customer, shall be billed according to existing extension rules.
C. When replacing a meter socket or other equipment located at a central distribution point, the
meter socket shall contain a service disconnect or a service disconnect shall be located adjacent
to the meter socket. The installation shall comply with NEC 550.32.
State Certification Seals
Page114
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
704.
Item
No.
1
2
3
4
5
6
7
Issued Jan 2016
SERVICE ENTRANCE PEDESTAL FOR MANUFACTURED HOMES
100-200 AMP, SINGLE-PHASE, 3-WIRE – 120/240 VOLT – UNDERGROUND
Description
Underground service lateral
Meter
Mobile/manufactured home service entrance
Ground in accordance with the NEC (see Chapter 14)
Pedestal
Factory provided “stabilizing foot”
Mobile/manufactured home 4-wire power supply cord or
permanent installed 4-wire feeder
Furnished &
installed by
Utility
X
X
Furnished &
installed by
Customer
X
X
X
X
X
NOTES:
1. A mobile/manufactured home service entrance pedestal or an additional disconnecting means
listed as suitable for service entrance use shall be located in sight of and not more than 30’ from
the exterior wall of the mobile/manufactured home it serves.
2. A clear space of 4’ shall be maintained in front of and in back of the meter pedestal.
3. Commercially made mobile/manufactured home metered service entrance pedestals shall be
listed as suitable for service equipment for manufactured homes.
Page115
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
705.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Issued Jan 2016
FIELD BUILT SERVICE ENTRANCE FOR MANUFACTURED HOMES 100-200
AMP, SINGLE-PHASE, 3-WIRE – 120/240 VOLTS – OVERHEAD
Description
Overhead service drop
Cable dead-ends(s)
Connectors
Meter
Pole, treated, Class 6 Min. 5" Diameter at top, length as
required to meet clearances
Guy, galvanized, stranded steel ¼” min. and guy guard
Anchor
Ground in accordance with the NEC (see Chapter 14)
Conduit or service entrance cable
Rain-tight service head
Mobile/manufactured Home service entrance equipment, rated
for outdoors use single main with provisions for feeder or
branch circuits
Approved meter socket
Either a 4-wire mobile home power supply cord or a
permanently installed 4- wire feeder
Field built structure – See section 613
Furnished &
installed by
Utility
X
X
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. The installation shall provide adequate clearances for Alliant Energy’s overhead service cables.
Above-ground and other clearance requirements are shown in Chapter 13.
2. A mobile home service entrance equipment or an additional disconnecting means listed as
suitable for service entrance use shall be located in sight of and not more than 30 feet from the
exterior wall of the mobile home it serves.
3. Service equipment shall be listed as (e.g. U.L.) suitable for service equipment, rated for outdoor
use, power outlet type service equipment listed for mobile home or a separate meter socket,
disconnect and distribution panel shall be used.
Page116
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
705.
Issued Jan 2016
FIELD BUILT SERVICE ENTRANCE FOR MANUFACTURED HOMES 100 200 AMP, SINGLE-PHASE, 3-WIRE – 120/240 VOLTS – OVERHEAD –
CONTINUED
Page117
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
706.
Item
No.
1
2
3
4
5
6
7
8
9
Issued Jan 2016
FIELD BUILT SERVICE ENTRANCE FOR MANUFACTURED HOMES, 100 –
200 AMP, SINGLE-PHASE, 3-WIRE – 120/240 VOLTS – UNDERGROUND
Description
Furnished &
installed by
Utility
X
X
Underground service lateral
Socket type meter
Ground in accordance with the NEC (see Chapter 14)
Rigid Conduit
Mobile/manufactured home service entrance equipment, rated
for outdoor use, single main with provisions for feeder or
branch circuits
Approved meter socket
Either a 4-wire manufactured home power cord or a
permanently installed 4- wire feeder
Furnished &
installed by
Customer
X
X
X
X
X
X
X
Field built structure, see section 613
Expansion joint
NOTES:
1. The free standing service entrance equipment shall contain a means for serving an accessory
building or structure or additional electrical equipment located outside manufactured home by a
fixed wiring method.
2. Service equipment shall be listed as (e.g. U.L.) suitable for service equipment. Power outlet type
service equipment listed for manufactured home or a separate meter socket, disconnect and
distribution panel shall be used.
3. Wood field built pedestals shall have a minimum of two 6” x 6” wood posts and 2” x 6” planks
that are commercially treated against decay. The posts shall be buried a minimum of 4 feet deep,
plumb and set in concrete the full depth. The planks shall be level and fastened with galvanized
hardware. The standard width is 24 inches to 60 inches.
4. Alliant Energy Engineering approval is required for use.
Page118
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
706.
Issued Jan 2016
FIELD BUILT SERVICE ENTRANCE FOR MANUFACTURED HOMES, 100 –
200 AMP, SINGLE-PHASE, 3-WIRE – 120/240 VOLTS – UNDERGROUND –
CONTINUED
Page119
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
707.
Item
No.
1
2
3
4
5
6
7
Issued Jan 2016
MANUFACTURED HOME SERVICE PEDESTAL, MOUNTED ON FROST
WALL PERMANENT FOUNDATION, SINGLE-PHASE, 100 – 200 AMP, 120/240
VOLTS.
Description
Underground service lateral
Socket type meter
Service entrance pedestal
Ground in accordance with the NEC (see Chapter 14)
Mobile/manufactured home service entrance equipment, rated
for outdoor use, single main with provisions for feeder or
branch circuits. Can be foundation mounted or free standing
Factory installed feeder panel
Permanently install 4-wire feeder to manufactured home
Page120
Furnished &
installed by
Utility
X
X
Furnished &
installed by
Customer
X
X
X
X
X
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
708.
Item
No.
1
2
3
4
5
6
7
8
Issued Jan 2016
MANUFACTURED HOME SERVICE PEDESTAL, MOUNTED ON FULL
BASEMENT, PERMANENT FOUNDATION, SINGLE-PHASE, 100 – 200 AMP,
120/240 VOLTS.
Description
Underground service lateral
Socket type meter
Standard house meter pedestal
Ground in accordance with the NEC (see Chapter 14)
Service entrance equipment, single main disconnect with
provisions for feeder of branch circuits
Factory installed feeder panel
Permanently install 4-wire feeder to manufactured homes
Service entrance conductors
Page121
Furnished &
installed by
Utility
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
Chapter 7
ELECTRIC SERVICE RULES
HUD MANUFACTURED HOMES
Issued Jan 2016
THIS PAGE INTENTIONALLY LEFT BLANK
Page122
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
CHAPTER 8
ELECTRIC SERVICE RULES – FARM SERVICES
800. SCOPE
This chapter includes single and three phase services to farms, farmettes / acreages where animals
may be present and irrigation installations. The services will be provided either as overhead or
underground service. The service will connect to customer yard poles or an approved field built
structure.
801. NON-FARM SERVICES
Services for installations not covered in this chapter shall be installed in accordance with services as
shown in chapters 3 and 4, with special regard to provisions of ESR 802. B.
802. FARM SERVICE YARD POLE OR STRUCTURE
A. The farm service yard pole is owned by the customer. This structure shall be located on the
customer's property. Under no circumstances may the customer's pole or structure be located in
road right-of-way.
B. Services with animals shall maintain a minimum 12 feet and a maximum of 20 feet horizontal
separation between Alliant Energy's underground transformer and the customer’s service
equipment. The minimum separation between the transformer pole and customer's metering
point is also 12 feet but the maximum separation for overhead service is 30 feet.
C. For safety concerns, the customer shall consult Alliant Energy before installing equipment on a
yard pole.
D. All farm use meters shall be installed on the yard pole or structure. Meters for other uses are not
permitted on the yard pole or structure.
Informational Note: To prevent flicker issues at the non‐farm customers caused by the farm loads, a separate transformer is required. The non‐farm customers should be served in accordance with services as shown in chapters 3 and 4. E. All underground circuits extending from the structure shall be feeders or branch circuits.
F. The customer shall protect the yard pole or structure and the equipment on it from damage by
vehicles and farm equipment. The equipment shall be maintained in good operating condition
and repaired or replace when warranted at the customer’s expense.
G. Alliant Energy requires all meters be installed so the meter faces an area (usually a driveway) that
will accommodate motor vehicle access to the meter. This will allow the meter to be read from
the vehicle if necessary.
Page123
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
H. The bonding conductor from the pole top transfer switch (NEC 547.2 Site Isolation Device)
I.
J.
K.
L.
M.
N.
and all grounding and grounded conductors for the customer's wiring system shall be connected
together at the yard pole as shown in the grounding chapter (Chapter 14).
The customer's pole top transfer switch shall be approved (by Alliant Energy) as a single switch
unit mounted in one enclosure. See Electric Service Equipment Book - Chapter 2.
Pole top switch installations shall have a minimum switch size of 400 Amps. A customer-owned
yard pole will be used to support the customer's electrical distribution center.
Alliant Energy distribution poles shall not be used as farm service yard poles.
Alliant Energy will not install additional service drops or laterals to any farm building or farm
structure when any portion of the building or structure is located within 150 feet of the yard
pole distribution center. If another yard pole service is warranted, the separation between the
yard-poles shall be 300 feet minimum, measured in a straight line.
A separate service may be installed to a building on the farm site if that building is not part of
the farm operation. The separate service may not originate from the yard pole or structure.
Farms with two or more services on the same tract or parcel of land shall maintain a permanent
plaque at each service location indicating its usage (NEC 547.9).
Examples of multiple service points are:
1) Two overhead or underground farmstead distribution points
2) One farmstead distribution point and one grain drying distribution point
3) One farmstead distribution point and a separate meter on the house
Page124
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
THIS PAGE INTENTIONALLY LEFT BLANK
Page125
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
803.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
Issued Jan 2016
OVERHEAD SERVICE TO A FARM YARD POLE, WITH GRADE LEVEL
DISCONNECT AND OVERCURRENT PROTECTION, 300 AMP MAX. AND
240 VOLT MAX
Description
Service drop
Service connectors
Meter
Pole - treated 35' Class 5 minimum
Down guy, anchor and guy guard
Service entrance
Overhead service conduit
Weather head
Approved meter socket
Ground in accordance with the NEC (see Chapter 14)
Feeder conduit
Customer’s feeder conductors
Furnished &
installed by
Utility
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Customer shall provide 36 inch leads at the weatherhead.
2. All customer equipment shall be installed on two adjacent quadrants of the pole as shown in the
top view.
3. If large equipment is to be driven under the service drop, see NESC 232.1.
4. Drop shall be a minimum of 18 feet above ground at the lowest point.
5. Sites with multiple service points require each service point to be identified per NEC 547.9
Page126
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
803.
Issued Jan 2016
OVERHEAD SERVICE TO A FARM YARD POLE, WITH GRADE LEVEL
DISCONNECT AND OVERCURRENT PROTECTION, 300 AMP MAX. AND
240 VOLT MAX – CONTINUED
Page127
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
804.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
Issued Jan 2016
OVERHEAD SERVICE TO A FIELD BUILT STRUCTURE, WITH GRADE
LEVEL DISCONNECT AND OVERCURRENT PROTECTION, 300 AMP MAX
AND 240 VOLT MAX
Description
Service drop
Meter
Field-built structure – requires treated 6”x “6 post(s),
2”x6” planks, galvanized hardware and set in concrete
Approved meter socket
Pole-treated 35’ class 5 minimum
Down guy and anchor and guy guard
Ground in accordance with the NEC (see Chapter 14)
Service entrance (optional: service rated transfer switch)
Overhead service conduit with weather head
Feeder panels or branch circuits, if needed
Expansion joints as required by the NEC
Customer feeder conductor
Furnished &
installed by
Utility
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Customer shall provide 36 inch leads at the weather head.
2. If large equipment is to be driven under the service drop, see NESC 232.1. Drop shall be a
minimum of 18 feet above ground at the lowest point.
3. Sites with multiple service points require each service point to be identified per NEC 547.9
Page128
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
804A. OVERHEAD SERVICE TO A FIELD BUILT STRUCTURE, WITH GRADE
LEVEL DISCONNECT AND OVERCURRENT PROTECTION, 300 AMP MAX
AND 240 VOLT MAX
Page129
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
804B. OVERHEAD SERVICE TO A FIELD BUILT STRUCTURE, WITH GRADE
LEVEL DISCONNECT AND CURRENT TRANSFORMER METERING FOR
FARM /OR IRRIGATION
301 - 800(3) AMP - SINGLE PHASE - 120/240 VOLT
301 - 800(3) AMP - THREE PHASE - 120/208 VOLT
100 - 800(3) AMP - THREE PHASE - 277/480 VOLT
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Description
Service drop
Current transformers and potential transformers
Meter
Current transformer cabinet
Metering conduit (1” Rigid Galv. Steel)
Approved meter socket
Customer service conduit
Customer’s service entrance panel, optional if less than six
feeder panels
Customer feeder panels
Ground in accordance with the NEC (see Chapter 14)
Customer feeder conduit
Expansion sleeves
Down guy, anchor, guy guard
Field built structure – requires treated 6”x “6 post(s) ,
2”x6” planks, galvanized hardware and set in concrete
Pole - treated 35’ Class 5 minimum
Furnished &
installed by
Utility
X
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Alliant Energy will install an overhead service drop in accordance with Alliant Energy’s
applicable rates and extension rules.
2. If large equipment is to be driven under the service drop, see NESC 232.1. Drop shall be a
minimum of 18 feet above ground at the lowest point.
3. 600 Amp Continuous Duty or 800 Amp Intermittent Duty Service Equipment.
4. Sites with multiple service points require each service point to be identified per NEC 547.9
Page130
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
804B. OVERHEAD SERVICE TO A FIELD BUILT STRUCTURE, WITH GRADE
LEVEL DISCONNECT AND CURRENT TRANSFORMER METERING FOR
FARM /OR IRRIGATION – CONTINUED
301 - 800(3) AMP - SINGLE PHASE - 120/240 VOLT
301 - 800(3) AMP - THREE PHASE - 120/208 VOLT
100 - 800(3) AMP - THREE PHASE - 277/480 VOLT
Page131
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
805.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
Issued Jan 2016
OVERHEAD SERVICE TO A FARM YARD-POLE, WITH POLE TOP
TRANSFER SWITCH (Site-Isolation Device)
301 - 800(4) AMP - SINGLE PHASE - 120/240 VOLT
301 - 800(4) AMP - THREE PHASE - 120/208 VOLT
100 - 800(4) AMP - THREE PHASE - 277/480 VOLT
Description
Service drop
Current transformers
Potential transformers
Meter
Pole - treated 35’ class 5 minimum
Pole top transfer switch (2-pole for 1-phase, 3-pole for 3-phase)
Metering conduit (1” rigid galv. steel)
Approved meter socket
Customer’s overhead circuit
Down guy, anchor and guy guard
Stand-by generator circuit (optional)
Operating handle for pole top disconnect
Ground in accordance with the NEC (see Chapter 14)
Furnished &
installed by
Utility
X
X
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
NOTES:
1. The site-isolation device option only applies to farms that meet the requirements in note 2,
2.
3.
4.
5.
6.
7.
herein. Otherwise, the farm must be served per the other sections in Chapter 8, Farm Services.
A Site-Isolation Device shall apply to NEC 547 agricultural buildings or that part of a building
or adjacent areas of similar or like nature of similar or like nature as specified in:
a. Agricultural buildings where excessive dust and dust with water may accumulate, including
all areas of poultry, livestock and fish confinement systems, where litter dust or feed dust,
including mineral feed particles may accumulate.
b. Agricultural buildings where a corrosive atmosphere exists
Customer to mount instrument transformer bracket(s).
600 Amp continuous duty or 800 Amp intermittent duty service equipment
If large equipment is to be driven under the service drop, see NESC 232.1. Drop shall be a
minimum of 18 feet above ground at the lowest point.
Sites with multiple service points require each service point to be identified per NEC 547.9
All loads must be fed overhead only for this type of construction.
Page132
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
805.
Issued Jan 2016
OVERHEAD SERVICE TO A FARM YARD POLE – WITH POLE TOP
TRANSFER SWITCH-CONTINUED
301 - 800(4) AMP - SINGLE PHASE - 120/240 VOLT
301 - 800(4) AMP - THREE PHASE - 120/208 VOLT
100 - 800(4) AMP - THREE PHASE - 277/480 VOLT
Note – All loads must be fed overhead only for this type of construction.
Page133
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
806.
Item
No.
1
2
3
4
5A
5B
5C
6
7
8
9
10
11
Issued Jan 2016
UNDERGROUND SERVICE FROM AN OVERHEAD TRANSFORMER TO A
FARM, ON A FIELD BUILT STRUCTURE
100 - 300 AMP - SINGLE-PHASE - 120/240 VOLT
100 - 300 AMP - THREE-PHASE - 120/208 VOLT
Description
Service lateral
Meter
Approved meter socket
Field-built structure – requires treated 6”x “6 post(s),
2” x 6” planks, galvanized hardware and set in concrete
Service disconnect –optional - (required if 5B utilized)
Transfer switch - 2 pole or 3 pole - optional
Stand-by generator circuit and outlet - optional
Expansion joints
Ground in accordance with the NEC (see Chapter 14)
Feeder panels if needed; or service rated equipment
(1 to 6 disconnects if no service overcurrent device is used.)
Pole – optional
Expansion joint as required by the NEC
Customer’s conduit
Furnished &
installed by
Utility
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Item #8 above is limited to six service disconnects without Item 5A.
2. Items 5A & 5B may be replaced by a service rated transfer switch.
3. Sites with multiple service points require each service point to be identified per NEC 547.9
Page134
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
806.
Issued Jan 2016
UNDERGROUND SERVICE FROM AN OVERHEAD TRANSFORMER TO A
FARM, ON A FIELD BUILT STRUCTURE - CONTINUED
100 - 300 AMP - SINGLE-PHASE - 120/240 VOLT
100 - 300 AMP - THREE-PHASE - 120/208 VOLT
Page135
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
807.
Item
No.
1
2
3
4
5
6
7
8
9A
9B
9C
10
11
12
13
14
15
Issued Jan 2016
UNDERGROUND SERVICE TO A FARM, ON FIELD BUILT STRUCTURE,
WITH OVERCURRENT PROTECTION
301 - 600 AMP - 120/240 VOLTS - SINGLE-PHASE (FROM PAD XFMR)
301 - 1200(3) AMP - 120/208 VOLTS -THREE-PHASE (FROM PAD XFMR)
100 - 1200(3) AMP - 277/480 VOLTS - THREE-PHASE (FROM PAD XFMR)
301 - 600 AMP - 120/240 VOLTS - SINGLE-PHASE (FROM POLE XFMR)
100 - 400 AMP - 277/480 VOLTS - THREE-PHASE (FROM POLE XFMR)
Description
Pad-mounted transformer
Service lateral
Meter
Box pad for 1 phase transf. See # 12 below for 3 phase
Field-built structure – requires treated 6”X “6 post(s),
2”X6” planks, galvanized
Rigid conduit
Metering transformer cabinet
Approved meter socket
Service disconnect- option-(required if 9B utilized)
Transfer switch - optional (2-pole: 1-phase, 3-pole: 3-phase)
Stand-by generator weatherproof junction box-optional
Ground in accordance with the NEC (see Chapter 14)
Optional feeder panels or service rated equipment (1-6
disconnects) if no service overcurrent device is used.
3PH Transformer foundation: concrete pad or box pad.
Expansion joint
Expansion joint as required by the NEC
Customer pole Class 5 minimum
Furnished &
installed by
Utility
X
X
X
X
Furnished &
installed by
Customer
X
X
X
X
X
X
X
X
X
X
X
X
X
NOTES:
1. A clear space of 10 feet shall be provided in front of the transformer
2. Item #11 above is limited to six service disconnects without Item 9A.
3. Field-built structure design is limited to a 1200 Amp max cabinet. For larger services, see ESR
section 808, pad-mount CT cabinets.
4. Customer to install primary conduit into the transformer – see ESR section 407.
5. Items 9A and 9B may be replaced by a service rated transfer switch. Sites with multiple service
points require each service point to be identified per NEC 547.9.
Page136
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
807A. UNDERGROUND SERVICE TO A FARM, ON FIELD BUILT STRUCTURE,
WITH OVERCURRENT PROTECTION - CONTINUED
301 - 600 AMP - 120/240 VOLTS - SINGLE-PHASE (FROM PAD XFMR)
301 - 1200(3) AMP - 120/208 VOLTS - THREE-PHASE (FROM PAD XFMR)
100 - 1200(3) AMP - 277/480 VOLTS - THREE-PHASE (FROM PAD XFMR)
Page137
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
807B. UNDERGROUND SERVICE TO A FARM, ON FIELD BUILT STRUCTURE,
WITH OVERCURRENT PROTECTION - CONTINUED
301 – 600 AMP – 120/240 VOLTS – SINGLE-PHASE (FROM POLE XFMR)
100 – 400 AMP – 277/480 VOLTS – THREE-PHASE (FROM POLE XFMR)
Page138
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
808.
Item
No.
1
2
3
4
5
6
7
8
9
10
Issued Jan 2016
UNDERGROUND SERVICE TO A FARM, FROM A PAD-MOUNT
TRANSFORMER, WITH PAD-MOUNT CURRENT TRANSFORMER
CABINET, 301 - 3000 AMPS
Description
Furnished & Furnished &
installed by
installed by
Utility
Customer
Pad-mounted transformer
X
Service lateral in conduit
X
Meter
X
Box pad for 1 phase transformer
X
Concrete transformer pad – 3 phase
X
Rigid conduit
X
Pad-mounted instrument transformer cabinet
X
Approved meter socket
X
Expansion joint
X
Field-built structure – requires treated 6”x 6” posts,
X
2”x 6” planks, galvanized hardware and set in concrete
NOTES:
1. Any instrument metered service may utilize pad-mount metering equipment. However, it is
2.
3.
4.
5.
recommended that instrument cabinets, larger than 1200 amps, not be mounted on field built
structures.
A clear space of 10 feet shall be provided in front of the transformer.
If the transfer switch is service entrance rated equipment and has a sufficiently high fault current
rating, then a separate service overcurrent device is not required.
Customer to install primary conduit into the transformer – see ESR section 407.
Sites with multiple service points require each service point to be identified per NEC 547.9.
Page139
Chapter 8
ELECTRIC SERVICE RULES
FARM SERVICES
Issued Jan 2016
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Page140
ELECTRIC SERVICE RULES
UTILITY/CATV SERVICES
Issued Jan 2016
CHAPTER 9
ELECTRIC SERVICE RULES – UTILITY/CATV SERVICES
900. GENERAL
A. Alliant Energy receives many requests for electric service from other utilities; telephone,
telecommunications companies, cable television, the Department of Transportation and local
municipalities. This section has been established for service requests from these customers.
Many of these services include a request to place a meter socket and/or disconnect devices on
Alliant Energy poles which shall meet Grade B construction. Requests involving attachments of
customer equipment, disconnects, power supplies, risers and meter sockets can create conditions
where the pole becomes cluttered, making it very difficult and dangerous to climb. Requests for
underground service to customer owned underground termination and/or metering facilities
may or may not meet requirements set forth by Alliant Energy for service. We will look at each
request on an individual basis.
B. The preferred method for these types of services will be to an approved meter pedestal with or
without fused disconnects as shown in section 902.
C. Alliant Energy will not allow meter sockets or customer’s power equipment on the following
poles: transformer bank poles, capacitor poles, riser poles, three-phase switch poles, three-phase
buck arm corner or tap poles and ornamental lighting poles. Metering facilities will not be
allowed on Alliant Energy poles, except where a prior joint use attachment agreement exists
between Alliant Energy and the party requesting the service.
D. When the customer’s equipment, risers and meter-sockets are allowed on Alliant Energy poles,
they may not occupy more than two adjacent quadrants. Clearances shall be maintained as
indicated in the NESC, NEC and any local or state codes. Written approval or a signed Joint
Attachment Agreement shall also be obtained from Alliant Energy before any of these
attachments are placed on Alliant Energy poles. Failure to get approval will result in immediate
removal of the non-approved facilities.
E. Alliant Energy personnel will review municipal attachment requests for holiday lights or
decorations on poles. These attachments may be allowed if adequate space is available to meet
NESC requirements, and if the customer provides a fused weather-tight GFCI receptacle at the
point of service connection. All wires serving holiday decorations will be strung from pole to
pole. In no case will Alliant Energy provide service to holiday decorations from pole to building.
F. Wi-Fi installations are allowed on Alliant Energy facilities with approval. They require a signed
Joint Attachment Agreement through the Joint Facilities group before any facilities will be
considered for placement. Contact the Alliant Energy Joint Facilities Coordinator for further
information at 1-800-ALLIANT (800-255-4268).
Page141
Chapter 9
ELECTRIC SERVICE RULES
UTILITY/CATV SERVICES
901.
Item
No.
1
2
3
4
5
6
7
8
9
10
Issued Jan 2016
UTILITY/CATV POLE-MOUNT SERVICE, 120/240 VOLTS, SINGLE-PHASE,
3-WIRE, 200 AMP MAX CATV, TELEPHONE, MUNICIPAL (Maintenance Only)
Description
Furnished &
installed by
utility
Service weather head
Service entrance conduit
Service entrance conductors
Weather-proof service fused disconnect
Cable TV power supply or equivalent device
Ground in accordance with the NEC (see Chapter 14)
8’ ground rods (quantity as required)
Meter socket
Service conductors and connections
Meter
Furnished &
installed by
customer
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Non-metallic conduit, (Schedule 80). If metallic conduit is used, it shall be covered with a non2.
3.
4.
5.
6.
7.
8.
9.
10.
metallic covering 40 inches above and 40 inches below any communication attachments.
The service entrance conductors shall extend at least 36” beyond the service head to permit
proper connections.
The disconnect power supply unit, meter socket and TV cable shall be mounted on the same
quadrant of the pole.
When a unit contains both the service switch and the power supply, installation height shall be in
accordance with applicable codes.
Power supply units may not be mounted on poles where transformer banks, risers, vertical
supply conductors to aerial services, switch handles, traffic signal, capacitor banks or similar
fixtures exist. Power supplies may not be mounted on three-phase distribution corner poles or
tap poles.
When foreign facilities are attached to a pole supporting a lighting fixture, a clearance of 20” is
required.
Bonding should be provided between all metallic power and communications apparatus.
Minimum wire size shall be number 6 AWG and maximum wire size shall be 4/0.
Residential meter sockets are acceptable for service entrances 60 amps or less. For service
entrances 100 amps or larger, commercial meter sockets are required.
All installations shall conform to the NEC, the NESC, Iowa and Wisconsin state electrical codes
for clearances and working space.
Page142
Chapter 9
ELECTRIC SERVICE RULES
UTILITY/CATV SERVICES
901.
Issued Jan 2016
UTILITY/CATV POLE-MOUNT SERVICE, 120/240 VOLTS, SINGLE-PHASE,
3-WIRE, 200 AMP MAX CATV, TELEPHONE, MUNICIPAL (Maintenance Only)
Page143
Chapter 9
ELECTRIC SERVICE RULES
UTILITY/CATV SERVICES
902.
Item
No.
1
2
3
4
5
6
7
8
9
10
11
Issued Jan 2016
UNDERGROUND SERVICE, 120/240 VOLTS, SINGLE-PHASE, THREE-WIRE,
200 AMP MAX (CATV, TELEPHONE, MUNICIPAL)
Description
Underground service lateral
Meter
U-Guard
Riser pole
Meter socket
Service entrance equipment
Pedestal stake (minimum 6 feet)
Ground in accordance with the NEC (see Chapter 14)
Factory manufactured stabilization foot
Underground feeder circuit
Rigid conduit (for customer conductors when required)
Furnished &
installed by
utility
X
X
X
X
Furnished &
installed by
customer
X
X
X
X
X
X
X
NOTES:
1. Both grounding electrodes shall be installed on the same side of the pedestal.
2. If service is from a pad-mount transformer or Alliant Energy pedestal the 10 foot dimension
3.
4.
5.
6.
from the pad-mount transformer or pedestal can be reduced to 5 feet.
Item # 9, when the entrance trough on a meter pedestal is not divided for metered and unmetered conductors, the contractor shall provide a conduit exit from disconnect device.
The bottom of a disconnect means shall be mounted a minimum 2 feet above finished grade or
a platform.
Bonding should be provided between all above ground metallic supply and communications
enclosures (pedestals, terminals, apparatus cases, transformer cases, etc.) that are separated by a
distance of 6 feet or less. (2012 NESC 384.C)
Minimum wire size shall be number 6 AWG and maximum wire size shall be 4/0.
Reference ESE E117, COMMERCIAL METER PEDESTALS WITH MAIN 250 VOLTS MAX
Page144
Chapter 9
ELECTRIC SERVICE RULES
UTILITY/CATV SERVICES
902.
Issued Jan 2016
UNDERGROUND SERVICE, 120/240 VOLT, SINGLE-PHASE, THREE-WIRE,
200 AMP MAX (CATV, TELEPHONE, MUNICIPAL), CONTINUED
Fig 902
Page145
Chapter 9
ELECTRIC SERVICE RULES
UTILITY/CATV SERVICES
903.
Issued Jan 2016
NON-METERED HOLIDAY LIGHTING
(Only in Areas Where Permitted)
Page146
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
ELECTRIC SERVICE RULES – PRIMARY SERVICE
CHAPTER 10
1000. GENERAL
A. Primary metered service is defined as a service where the customer is served at a standard
primary voltage.
B. Three-Phase, primary voltage service, is available at Alliant Energy for the following voltages:
4.16 kV, 12.4 kV, 13.2 kV, 13.8 kV, 24 kV and 24.9 kV. Not every voltage is available at all
locations. This chapter contains information concerning service at distribution voltages.
C. Primary voltage service, at a single-phase distribution voltage is available from Alliant Energy.
Please consult Alliant Energy for single-phase primary service requirements. See Electric Service
Equipment book Chapter 2 for required single operated, grade-level air-break switches.
D. Alliant Energy furnishes, installs and maintains the primary service and metering equipment in
accordance with applicable rates, extension rules and the requirements of the Electric Service
Rules book Chapter 1. Alliant Energy also furnishes, installs and maintains all primary service
conductors and cable terminators up to the point of service.
E. The customer furnishes, installs and maintains all service entrance facilities at the point of
service including cabinets to house metering CT’s and PT’s and the installation of 1” galvanized
steel metering conduits where required.
F. The customer shall make application to Alliant Energy for the proposed primary service and
obtain approval of the location, equipment and design before starting installation of the service
entrance. Detailed shop drawings will be required for underground service terminations and
metering sections in switchgear.
G. A 10-foot wide cable route shall be free of all obstructions, within 6 inches of final grade for all
underground services, prior to the installation of Alliant Energy’s underground service lateral.
The customer shall also provide a 20 foot wide route for all single-phase overhead facilities and
30 foot wide route for all three-phase overhead facilities. The customer will incur all costs for
clearing either the overhead or underground routes, including tree removal, building and/or
foundation or rubble removal and any other obstacles encountered.
H. The customer shall provide the necessary easements, at no expense to Alliant Energy for the
installation and maintenance of the primary service. No permanent buildings or trees shall be
placed in the easement area.
Page147
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
I. A plan view drawing of the installation shall be submitted to and approved by Alliant Energy
Engineering and Metering, prior to finalizing orders for service equipment to avoid delays and
unnecessary expense for the customer and Alliant Energy. Service entrance equipment located at
the point of service shall include a three-phase, gang-operated load break disconnecting means
and over current protection for a three phase service or a single-phase handle operated
disconnect and over current protection for a single-phase service. The disconnecting device shall
be located to provide a visible open and operating capability to both the customer and Alliant
Energy. The sequence of the equipment toward the load shall be meter-switch-fuse with
variations approved by Alliant Energy. (See following diagram)
Page148
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
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Page149
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1001. OVERHEAD PRIMARY SERVICE
Item Description
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Overhead primary service conductors
PT’s and CT’s with mounting hardware
Socket type meter
Dead-end shoes and insulators
Disconnect and arresters (on previous structure, not pictured)
Arresters
Meter socket
Grounding
Poles
Overhead primary conductor
Primary fusing
Conduit for metering
Gang operated switch
Insulator in switch operating rod handle
Furnished &
Installed by
Utility
X
X
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
X
NOTES:
1. Customer shall provide two poles of adequate height that allows ground clearance in accordance
2.
3.
4.
5.
6.
7.
8.
with all codes for primary conductors including the neutral. The poles shall be of adequate class
to provide strength to support conductors with ice and wind loading. Further information on
this can be obtained from Alliant Energy.
The customer’s isolation switch shall be gang-operated from grade level, be lockable in the open
position, be operable by the customer and Alliant Energy, have means to show visible open
contacts, be capable of interrupting all load being served, be capable of carrying all load
requirements and withstanding faults of 10,000 amps RMS symmetrical.
Main fuses or breakers shall have adequate load carrying capacity and a minimum interrupting
rating of 10,000 amps, RMS symmetrical. Fuses and breakers shall coordinate with Alliant
Energy’s system. The customer shall verify this with Alliant Energy.
The customer shall supply a minimum 96” of vertical spacing for the installation of Alliant
Energy’s metering bracket with current and potential transformers. Alliant Energy will supply
the bracket for these transformers.
Branch circuit switches, operated at primary voltage, should meet operating criteria similar to the
main fuse or breakers to provide adequate protection to the transformers served. Fuse size for
Alliant Energy owned transformers will be specified by Alliant Energy
The customer shall provide adequate climbing space on the main service entrance structure as
specified in the National Electrical Safety Code.
Metering conduit is 1” rigid steel conduit with weatherhead. Maximum allowable conduit run is
50’ with a total of 180 degrees in bends. Runs longer than 50’ or runs with more than 180
degrees in bends shall be approved by Alliant Energy.
Consult Metering for appropriate PT’s and CT’s and ordering procedure. The meter cable will
be furnished and installed by Alliant Energy.
Page150
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
1001.
Issued Jan 2016
OVERHEAD PRIMARY SERVICE, CONTINUED
A main fuse needs to be installed on a pole within 50 feet of the main disconnect as shown above,
therefore, another pole may be required within the 50 foot distance. (NEC 230.91) Alliant Energy
will install a set of arresters on the closest upstream pole from the metering pole to protect the
CT’s/PT’s on the closest upstream pole.
Page151
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1002. UNDERGROUND PRIMARY SERVICE
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
Underground primary service cables
Terminators
PT’s and CT’s
Socket type meter
Primary switchgear
6” conduit
1” metering conduit
Metering socket
Grounding - Per NEC 250
Switchgear pad
Furnished &
Installed by
Utility
X
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
NOTES:
1. Switchgear drawings shall be submitted to Alliant Energy for approval before ordering
2. Utility cables entering the switchgear bus shall be bottom connected. Clear space shall be
3.
4.
5.
6.
provided for primary conductors below the termination points including room in the bottom of
the cabinet(s) for 6” conduit to enter directly below the center point of the three termination
points.
All bus and cable bracing shall have adequate strength to prevent movement or damage to cable
or bus at a maximum fault level of 10,000 amps (RMS symmetrical).
A single service disconnect may not be required. If six or fewer branch circuits are present the
service disconnect is not required by code. However, if on-site generation is present, the service
disconnect (or isolation switch) is required regardless of number of branch circuits. It shall be
gang operated, be operable by the customer and by Alliant Energy, have means to show visual
open contacts, be capable of carrying full load requirements and withstanding faults of 10,000
amps (RMS symmetrical).
Branch circuit switches should meet operating criteria similar to the service main disconnect.
Customer-owned main fuses or breakers shall have adequate load carrying capacity and a
minimum interrupting rating of 10,000 amps (RMS symmetrical) and shall coordinate with
Alliant Energy’s system.
Page152
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
7. Metering transformer space shall be adequate for three voltage transformers (PTs) and three
8.
9.
10.
11.
12.
current transformers (CTs). Consult Metering Dept. for appropriate PTs and CTs, ordering
procedure and shipment details to manufacturer for installation.
a. Alliant Energy will supply PTs and CTs similar to
General Electric JVM-5 (indoor) PTs and
General Electric JKM-5A (indoor) CT’s for 15 kV services.
b. Alliant Energy will supply PTs and CTs similar to
General Electric JVW-6 (outdoor) PTs and
General Electric JKW-6A (outdoor) CTs for 24.9 kV service.
For 24.9 kV service, the customer shall provide fuse holders similar to
GE Type EK-1C for the PTs. Alliant Energy will supply the fuses. For either voltage the PTs
should be tapped on the source side of the CTs. PTs and CTs shall be able to be mounted so
that the nameplates can be read from the front (preferred) or sides. The meter cable will be
furnished and installed by Alliant Energy.
A two-hole NEMA standard lug landing shall be provided for each service lateral cable in the
termination bay including the neutral bus. Minimum height of 54” is required from termination
lug to floor.
Hinged doors with provisions for locking with an Alliant Energy padlock for direct working
access to the termination bays and metering bays. In the metering bay, a second wire mesh
inner door shall be provided.
10 feet of clearance shall be provided in front of termination and metering bays. If Alliant
Energy is under contract to operate and maintain this switchgear, then the above provisions
apply to all bays of the switchgear. Arrangements for double locking or other special
procedures shall be discussed with Alliant Energy.
Grounding bails shall be provided for all three phases and the primary neutral bus at the
termination bay and metering Bay. If Alliant Energy is under contract to operate and maintain
this switchgear, then the above provisions apply to all bays of the switchgear. Arrangements for
double locking or other special procedures shall be discussed with Alliant Energy.
PT/CT drawers are acceptable if they do not interfere with operation and maintenance.
Page153
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1002. UNDERGROUND PRIMARY SERVICE - CONTINUED
3
Page154
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
15 kV METERING BAY
10"
14"
14"
10"
44" minimum
Lifting eyes
for CT’s & PT’s
Line Bussing
3
3
CT
CT
Ground
Points
CT
CT
Front inner
screen door
PT Fuses
3
PT’s mounted
on platform
PT
PT
3
PT
PT
Grounding Bail
FRONT VIEW BEHIND OUTER
AND INNER DOORS
RIGHT SIDE SECTIONAL VIEW
25 kV METERING BAY
15"
15"
15"
18"
15"
Lifting eyes
for CT’s
17"
17"
1
2
18"
3
Line Bussing
1
2
3
3
Ground
Points
Front inner
screen door
CT
CT
CT
3
1 3
CT
2
CT
PT fuses
3
Polyester
fiberglass
interface &
end barriers
Grounding
Bail
3
PT's
FRONT VIEW BEHIND OUTER
AND INNER DOORS
RIGHT SIDE SECTIONAL VIEW
Page155
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1003. UNDERGROUND PRIMARY SERVICE WITH OVERHEAD METERING
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Overhead primary conductors
Dead-end shoes and insulators
PTs and CTs with mounting bracket
Socket type meter
Disconnect and arresters (on previous structure, not pictured)
Pole
Guy and anchor
Underground primary cable, terminators and arresters
Disconnect switches
Grounding per NEC 250
Meter socket
Metering conduit
Switchgear
Switchgear pad
U-guard
Arresters
Furnished &
Installed by
Utility
X
X
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
X
X
X
NOTES:
1. Switchgear shall have a main disconnect that is gang operated, lockable with a visual open, be
2.
3.
4.
5.
6.
7.
capable of carrying full load requirements and withstanding faults of 10,000 amps (RMS
symmetrical).
Switchgear shall be located 10 feet from the base of pole for safety when climbing, for metering
and to minimize the length of unprotected primary cable.
Pole shall be of adequate height to allow for ground clearance in accordance with all codes for
primary conductors including the neutral. The pole shall be of adequate class to provide strength
to support conductors with ice and wind loading. Further information on poles can be obtained
from Alliant Energy.
The customer shall provide adequate climbing space on the main service entrance structure as
specified in the National Electric Safety Code (NESC).
The customer shall supply a vertical spacing of a minimum of 96” for the installation of Alliant
Energy’s metering bracket with CTs and PTs.
Disconnects on the pole shall have the ability to be opened under load with the use of a loadbuster tool.
Metering conduit – 1 inch rigid steel conduit with weatherhead. Maximum allowable conduit run
is 50 feet, with a total of 180 degrees in bends. Runs longer than 50 feet or runs with more than
180 degrees in bends shall be approved by Alliant Energy. Consult the Metering Department for
appropriate PTs and CTs and ordering procedure. The meter cable will be furnished and
installed by Alliant Energy.
Page156
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1003. UNDERGROUND PRIMARY SERVICE WITH OVERHEAD METERING CONTINUED
Page157
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1004. UNDERGROUND PRIMARY SERVICE TO METERING ENCLOSURE
Item
No.
Description
1
2
3
4
5
6
7
8
9
10
11
12
Underground primary service
PTs and CTs
Socket type meter
Disconnect and arresters (on previous structure, not pictured)
Primary metering enclosure (see Note 5 below)
Box pad
Meter socket
Underground primary cable with terminations and arresters
Switchgear
Switchgear pad
Arresters
Ground rod and grounding conductor
Furnished &
Installed by
Utility
X
X
X
X
Furnished &
Installed by
Customer
X
X
X
X
X
X
X
X
NOTES:
1. Box pad shall provide adequate space for training of primary cable.
2. Switchgear shall be located within 10 feet of metering enclosure to minimize the length of
3.
4.
5.
6.
unprotected customer primary cable.
Switchgear shall have a main disconnect that is gang operated, operable by Alliant Energy and
customer, lockable visual open, be capable of carrying full load requirements and withstanding
faults of 10,000 amps (RMS symmetrical).
Branch circuit switches operated at primary voltage should meet operating criteria similar to the
main disconnect.
Contact Alliant Energy Distribution Engineering for appropriate dead-front metering enclosure
as listed in the equipment section.
Consult the Metering Department for appropriate PTs and CTs, ordering procedure and
shipment details to manufacturer for installation.
Page158
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
1004. UNDERGROUND PRIMARY SERVICE TO METERING ENCLOSURE CONTINUED
Contact Alliant Energy Engineering to provide means to disconnect service to this enclosure by
closest upstream device for maintenance of PTs and CTs.
Page159
Chapter 10
ELECTRIC SERVICE RULES
PRIMARY SERVICE
Issued Jan 2016
THIS PAGE INTENTIONALLY LEFT BLANK
Page160
ELECTRIC SERVICE RULES
SPECIAL EQUIPMENT & MOTORS
Issued Jan 2016
CHAPTER 11
ELECTRIC SERVICE RULES – SPECIAL EQUIPMENT & MOTORS
1100. SERVICE IMPAIRING EQUIPMENT
A. Certain customer equipment can be service impairing. This equipment, because of its use, can
lower the quality of power to other customers. To prevent this, equipment that cannot be
modified must be eliminated or controlled with performance limits determined by Alliant
Energy. If the customer meet these limits but still causes an issue, the customer causing the issue
shall install equipment that minimizes service impairment or install corrective equipment at the
load location.
1. Common types of service impairing equipment include welders, arc furnaces, electric
motors, motor driven compressors, instantaneous water heaters, or other equipment having
highly fluctuating or large instantaneous demands.
2. Other types of service impairing equipment include those with loads that cause harmonic
distortion, such as large computers and variable speed controllers.
B. Where Alliant Energy’s electrical supply facilities are adequate to serve normal load additions, all
costs for additional facilities, metering and alterations specifically required to prevent impairment
of service to other customers, will be billed to the customer with service impairing equipment.
1101. PHASE BALANCE EQUIPMENT
The customer shall balance electrical loads on the service entrance. Each phase conductor shall carry
a minimum of 25% of the total KVA at maximum load conditions.
1102. POWER FACTOR CORRECTION
The use of equipment by the customer for power factor correction shall conform to the
requirements of Alliant Energy. The customer may be required to limit the size of static capacitor
installations or to maintain effective control of the capacitors in order to prevent the use of such
equipment from causing excessive voltage at the service. Corrective equipment shall be installed on
the load side of the service disconnecting device and metering.
Page161
Chapter 11
ELECTRIC SERVICE RULES
SPECIAL EQUIPMENT & MOTORS
Issued Jan 2016
1103. WELDERS
A. Preapproval from Alliant Energy is required before installing transformer type welders or
furnaces. Such equipment shall conform to this section of this Electric Service Rules and the
customer shall provide Alliant Energy with the following name plate information:
1. Manufacture, type and serial number
2. Frequency
3. Primary volts
4. Maximum input amperes at rated output
5. Output volts at rated output amperes
6. Rated output amperes
7. Rated duty cycle
8. Temperature rise in degrees Celsius
9. Open circuit voltage
B. Welders with a rated maximum operating input of 20 amperes or less may be used by residential
customers or general service customers if such use complies with the requirements in this
section. However, larger welders may be required to be three-phase.
1104. PROTECTION AND CONTROL
A. The customer shall be responsible for the protection against low voltage or phase loss wherever
low voltage, phase loss or unexpected restarting could cause damage to the customer’s
equipment or result in personal injury.
B. Control apparatus equipped with reverse-phase relays of an approved type shall be installed by
the customer on all poly-phase motor installations for:
1. Elevators, hoists and cranes
2. Manufactured processes where accidental reversal of rotation is liable to cause injury to
persons or damage to machinery, equipment or work in progress
1105. MOTOR SPECIFICATIONS
A. Single-phase motors that are started manually, or automatically more than four times per hour
are classified as frequently started motors. A frequently started motor may be connected to 120,
240 or 208-volt circuits provided its lock rotor current does not exceed 60 amperes.
B. A motor started four or fewer times per hour may be connected to 120, 240 or 208 volt circuits
provided its inrush current does not exceed 100 amperes. Customers contemplating the
purchase of any three phase motors or single-phase motors rated more than 5 horsepower (HP),
or having an inrush current greater than 100 amps, shall consult with Alliant Energy’s
engineering department regarding the capacity and character of service available. The cost of
additional facilities (including soft start equipment) that may be necessary to maintain service to
other customers shall be at the expense of the customer who creates the voltage problem.
C. In rural areas where no other customers are affected and where sufficient service and
transformer capacity exists, infrequently starting motors up to 10 HP single-phase/15 HP threephase may be permitted with Alliant Energy Engineering approval. Customers contemplating
purchase or use of a motor greater than 5 HP shall consult with Alliant Energy Engineering
regarding the capacity and character of service available.
Page162
Chapter 11
ELECTRIC SERVICE RULES
SPECIAL EQUIPMENT & MOTORS
Issued Jan 2016
Maximum Permitted HP for Single-Phase Motors
Max. HP
Frequent
Starts
(>4 per hour)
Max. HP
Frequent
Starts
(>4 per hour)
Max. HP
Infrequent
Starts
(<4 per hour)
Max. HP
Infrequent
Starts
(<4 per hour)
A
120 Volt
2
208 or 240
Volt
4
120 Volt
3-1/2
208 or 240
Volt
7-1/2
B
2
3-1/2
3
5
C
1-1/2
3
3
5
D
1-1/2
3
2-1/2
5
E
1-1/2
2
2
5
F
1
2
2
4
G
1
2
2
3-1/2
H
1
1-1/2
1-1/2
3
J
1
1-1/2
1-1/2
3
K
3/4
1-1/2
1-1/2
2
L
1/2
1
1
2
M
1/2
1
1
2
N
1/2
1
1
2
P
1/2
1
1
1-1/2
R
1/3
3/4
3/4
1-1/2
S
1/3
3/4
3/4
1
T
1/3
1/2
1/2
1
U
1/3
1/2
1/2
1
NEMA
Locked
Rotor
Code
Maximum kVA
14.4 kVA
Page163
28.8 kVA
Chapter 11
ELECTRIC SERVICE RULES
SPECIAL EQUIPMENT & MOTORS
Issued Jan 2016
Permitted Maximum HP Three-Phase Motors
NEMA
Locked Rotor
Code
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
Maximum kVA
Maximum HP
Frequently Started
Motors
(>4 per hour)
5
5
5
3
3
3
3
2
2
2
2
1-1/2
1-1/2
1-1/2
1
1
1
1
21.6 kVA
Maximum HP
Infrequently Started
Motors
(<4 per hour)
10
10
10
7-1/2
7-1/2
7-1/2
5
5
5
3
3
3
3
3
2
2
2
1-1/2
43.2 kVA
D. Air conditioning systems, including air-to-air and geothermal heat pumps shall have Locked
Rotor Current not to exceed 100 amps. Locked Rotor Amps (LRA) is usually listed on the unit's
nameplate. LRA exceeding 100 amps is considered service impairing and requires consultation
with Alliant Energy Engineering.
E. If service to any customer is negatively affected, the cost of additional facilities necessary to
provide adequate service shall be at the expense of the customer who causes the problem.
Equipment Rating
120 Volt
240 Volt up to 20,000 BTU/HR
240 Volt over 20,000 BTU/HR
Page164
Total Locked Rotor Current
of all components started
Simultaneously Not to Exceed
60 Amps
60 Amps
Consult Alliant Energy
ELECTRIC SERVICE RULES
OPTIONAL STANDBY GENERATION
Issued Jan 2016
CHAPTER 12
ELECTRIC SERVICE RULES – OPTIONAL STANDBY GENERATION
1200. SCOPE
This chapter addresses optional standby systems; these are not operated in parallel with Alliant
Energy’s electric distribution system. See chapter 5 for generator systems operated in parallel.
1201.
GENERAL INFORMATION
Optional standby generation units are installed as a customer convenience and are not legally
required. (See NEC 702.2)
1202. SAFETY
A. The customer shall consult Alliant Energy before connecting any generating equipment to any
customer circuit that is, or can be, supplied from Alliant Energy’s electric distribution system.
B. Transfer switches may only be located before the main service disconnects where the available
fault current is less than 10,000 amps.
C. The customer’s transfer device shall be constructed and connected to mechanically prevent any
possibility of power from the customer’s emergency source feeding back into Alliant Energy’s
distribution system.
1203. TRANSFER SYSTEM REQUIREMENTS
A. The customer may supply all or a portion of their electrical load from a standby generator.
B. The customer shall install a transfer switch or contactor to transfer all load from ungrounded
conductors to either the generator or normal supply.
C. Alliant Energy shall approve automatic transfer systems.
D. All transfer devices shall:
1. Prevent connecting the generator to the load until after the load is disconnected from Alliant
Energy’s system.
Exception: Closed transition type transfer switches that interconnect the emergency generators and
the normal supply for a maximum of 100 milliseconds (1/10 second).
2. Prevent accidental connection of the generator to Alliant Energy’s system.
3. Closed transition type transfer switches shall have a lockable, visually-open break in the
circuit between the normal supply and the transfer switch.
NOTES:
Closed transition = close before break, no disruption to load.
Open transition = open before break, requires disruption to load.
Page165
Chapter 12
ELECTRIC SERVICE RULES
OPTIONAL STANDBY GENERATION
Issued Jan 2016
1204. TRANSFER SWITCH OPTIONS.
A. Permitted:
1. Manual or automatic double throw switches
2. Double throw relays
3. Mechanically interlocked switches
4. Mechanically interlocked fuse block
B. Permitted in dry, corrosion free, dust free environments - such as indoors:
1. Breakers with factory designed mechanical interlocks
C. Not permitted:
1. Key interlocked switches
2. Key interlocked breakers
3. Switches that plug into the meter-socket
4. The addition of splices or taps in meter sockets and CT cabinets
Informational Note: Experience has shown that Key Interlocked Switching can be safely used in industrial applications where there is a full time electrical staff on site on a continuous basis that does the switching. Switches that plug into meter sockets and splices or taps in meter sockets and CT cabinets are not allowed because both are sealed so the customer does not have needed access for inspection or maintenance. Also, in both applications there are UL issues of non‐compliance. 1205. TRANSFER SWITCHES
A. Pole-Top Transfer Switches shall be listed in the ESE book
(NEC 547.2 Site-isolating device)
1. ESE 229 – 250 Volt
2. ESE 230 – 600 Volt
B. Grade-Level Transfer Switches
1. Grade-level transfer switches, with integral meter-sockets, will be listed in the ESE book,
ESE 231.
2. Grade-level transfer switches, without integral meter-sockets, do not require Alliant Energy
approval and will not be listed in the ESE book, but installation must:
a. Meet the requirements of NEC
b. Be listed by an approved testing laboratory, e.g., (U.L.)
c. Meet ESR 503 requirements
Page166
Chapter 12
ELECTRIC SERVICE RULES
OPTIONAL STANDBY GENERATION
Issued Jan 2016
1206. CONNECTION AND NEUTRAL SWITCHING REQUIREMENTS
Figure
SEPERATELY DERIVED
SYSTEM STANDBY
GENERATORS *
TRANSFER
SWITCH
LOCATION
Transfer switch installed
on a feeder with separate
equipment grounding and
neutral conductors or on
a branch circuit.
1
Transfer switch on the
source side of a singlefamily residential service
entrance rated 200 amps
or less (Available fault
current of 10,000 amps or
less).
2
(includes portable generators)
NON-SEPERATELY
DERIVED SYSTEM
STANDBY GENERATORS
The generator’s neutral is bonded to
the generator’s equipment grounding
conductor at the generator and a
grounding electrode system is required
at the generator.
The generator’s neutral is NOT
bonded to the generator’s equipment
grounding conductor at the generator
and a grounding electrode system is
NOT required at the generator.
1. Connect the generator’s
equipment grounding conductor
to the feeder’s/branch circuit’s
equipment grounding conductor
and the generator’s neutral
conductor to the feeder’s/branch
circuit’s neutral conductor.
2. Neutral must be switched.
1. Connect the generator’s
equipment grounding conductor
to the feeder’s/branch circuit’s
equipment grounding conductor
and the generators neutral
conductor to the feeder’s/branch
circuit’s neutral conductor.
2. Do not switch the neutral.
1. Connect the generator’s equipment grounding conductor and neutral
conductor to systems grounded neutral conductor.
2. Do not switch the neutral.
NEC 547 – Agricultural
building pole top siteisolating device (transfer
switch)
3
Service entrance rated
transfer switch.
1. Connect the generator’s equipment grounding conductor and neutral
conductor to the service entrance’s grounded neutral bus.
2. Do not switch the neutral.
4
Transfer switch is located
on a feeder with a
grounded neutral
(Allowed prior to 2008
NEC).
1. Connect the generator’s equipment grounding conductor and neutral
conductor to systems grounded neutral conductor.
2. Do not switch the neutral.
*A separately derived generator is a generator that can be operated without being interconnected to a service
entrance panel by a transfer switch. A typical application is to provide power to portable equipment. A nonseparately derived generator cannot provide power directly to portable equipment.
Switching criteria: Do not switch the equipment grounding conductor or the grounded neutral conductor. Do
not re-ground the neutral after the grounded neutral conductor has been separated into a neutral conductor
and an equipment grounding conductor.
Page167
Chapter 12
ELECTRIC SERVICE RULES
OPTIONAL STANDBY GENERATION
Issued Jan 2016
TRANSFER SWITCH IS INSTALLED ON A FEEDER WITH SEPARATE EQUIPMENT
GROUNDING AND NEUTRAL CONCUCTORS OR ON A BRANCH CIRCUIT
SEPARATELY DERIVED SYSTEM
NON-SEPARATELY DERIVED SYSTEM
TRANSFER SWITCH ON THE SOURCE SIDE OF A SINGLE FAMILY RESIDENCE’S
SERVICE ENTRANCE
OR
NEC 547 AGRICULTURAL BUILDING, POLE TOP SITE ISOLATED DEVICE
SEPARATELY DERIVED SYSTEM
NON-SEPARATELY DERIVED SYSTEM
Page168
Chapter 12
ELECTRIC SERVICE RULES
OPTIONAL STANDBY GENERATION
Issued Jan 2016
SERVICE ENTRANCE RATED TRANSFER SWITCH
SEPARATELY DERIVED SYSTEM
NON-SEPARATELY DERIVED SYSTEM
TRANSFER SWITCH IS LOCATED ON A FEEDER WITH A GROUNDED NEUTRAL
(PRIOR TO NEC 2008)
SEPARATELY DERIVED SYSTEM
NON-SEPARATELY DERIVED SYSTEM
Page169
Chapter 12
ELECTRIC SERVICE RULES
OPTIONAL STANDBY GENERATION
Issued Jan 2016
1207. STANDBY GENERATOR INSTALLATION (GENERATOR SUPPLIES
CUSTOMER’S ENTIRE LOAD AT TWO DIFFERENT LOCATIONS) SINGLEPHASE, 120/240 VOLTS, UP TO 300 AMPS
The customer shall install, own and maintain the entire installation except for Alliant Energy’s
meters.
M
Alliant Energy Meters
Two
Pole
Transfer
Switch
Three
Pole
Transfer
Switch
G
Customer's
Main
Disconnect
M
Customer's
Main
Disconnect
NOTES:
1. The generator service disconnect(s) and overcurrent protection may be an integral part of the
generator.
2. Transfer switches shall be listed by an approved testing agency.
3. One of the transfer switches shall be a two-pole device. All other transfer switches shall be
three-pole devices to open the neutral between the services.
4. Typically, the generator will be located near the two-pole transfer switch.
Page170
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
CHAPTER 13
ELECTRIC SERVICE RULES – CLEARANCES
1300. SCOPE
This chapter covers the minimum clearances required by Alliant Energy for secondary and service
voltages 480 volts or less. These requirements are designed to meet or exceed NEC, NESC, NFPA
and state or building code minimum requirements.
1301.
MINIMUM CLEARANCES FOR SERVICES 300 VOLTS AND BELOW
The NEC and NESC prescribe minimum clearances for service wires.
A. 10-feet minimum to drip loops of triplex, if voltage to ground is less than 150 volts.
B. 1-foot minimum and 2-feet maximum horizontal and 6 to 12 inch vertical (above or below)
between service head and attachment.
C. Exposed conductors shall be no less than 3-feet from window, doors, porches, fire escapes,
awnings, signs and similar construction, when service is attached to building. The exposed
service conductors shall be 3-feet from all sides except top of window. When the service
conductors are attached above a window the drip loop shall not sag below the top of the
window.
Page171
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
D. Iowa follows the NESC clearances from Table 234-1. In those states where the service passes
E.
F.
G.
H.
I.
J.
K.
L.
M.
N.
O.
over a building, but does not attach, the vertical roof clearance shall be 11-feet, if the roof is
accessible, or 3.5-feet, if the roof is not accessible. In Wisconsin, PSC 114.234.1 changes the
NESC requirements where the service passes over a building but does not attach, to 8 feet over
a roof that is non-accessible and 3 feet if the roof is non-accessible and has a 4/12 slope.
5-feet when wires pass opposite a window, where the service is attached. (NESC table 234-1)
2-feet from communication wires. (NESC table 233-1)
12-feet. If the height of building does not permit 12-feet, it can be reduced to 10.5-feet. If the
voltage to ground is less than 150 volts, it can be reduced to 10-feet.
Center of meter 4 - 5 feet above finished grade.
On buildings where service attaches, the vertical clearance over a porch or balcony shall be a
minimum of 10-feet if the area is accessible. For inaccessible areas it may be reduced. (NESC
234C 3D)
When a door opens outward, mount the meter socket a door’s width plus 6-inches on the
hinged side away from the door opening. Don’t mount the meter along high traffic passageways.
See section 302.
A minimum horizontal separation of 3-feet shall be maintained between natural gas service
equipment (vented regulators) and electric metering or termination equipment. Transformers
shall have a minimum separation of 5-feet from natural gas service equipment. A minimum
separation of 5-feet shall be maintained between electric metering or termination equipment and
liquid petroleum facilities on site but not filled on site. If the liquid petroleum facilities are filled
on site the minimum separation is 10-feet.
16-feet over a driveway, may be reduced on residential only drives to 12.5-feet for insulated
drops limited to 300 Volts to ground or 12-feet for triplex service drops limited to 150 Volts to
ground. (NESC table 232-1)
The horizontal clearance to buildings, signs etc. where services (at rest) pass but are not attached
to the building at this location is 4.5-feet. If the drop meets (NESC) 230C1 the clearance may be
reduced to 2-feet if the building is maintenance free. If the drop is subject to wind movement,
then the horizontal clearance is 3.5-feet at blow out position.
Minimum vertical clearance of railroad is 24.5-feet in Wisconsin and 27.5-feet in Iowa. Iowa
assumes a railcar height of 23-feet instead of NESC standard of 20 feet.
Page172
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
1302. MIN. CLEARANCES FOR SERVICES 300 VOLTS AND BELOW, OVER POOLS
y
y
x
y
x
x
Z
z
w
Z
Insulated supply/service cables
up to 750V to ground. Supported
and cabled with an effectively
grounded neutral conductor
All other supply/service
drop conductors
X- Clearances in any
direction to the water level,
edge or water surface, base
of diving platform or
permanently-anchored raft
22.5’
25’
Y-Clearance in any direction
to the diving platform or
tower
14.5’
17’
W- Clearance from all underground conductors from the outside edge of the pool shall be a
minimum of 5 feet.
Z- Horizontal limit of clearance measured from the inside wall of the pool shall extend to the outer
edge the structure and not less than 10 feet.
1303. MINIMUM CLEARANCE FOR SERVICES OVER STATE AND FEDERAL
HIGHWAYS
Clearance
Iowa
Wisconsin
Height
20 ft.
17 ft. *
*Alliant Energy has adopted a minimum of 20-feet clearance on all rural crossings for safety; this
applies to Wisconsin.
Page173
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
1304. SERVICE CONDUCTOR CLEARANCE FROM SIGNS
Conductor or Cable
Horizontal (displaced by wind)
Vertical
Clearance
3.5 ft.
3.5 ft.
1305. SERVICE MAST INSTALLATION – ROOF CLEARANCES, CLEARANCE OF
SERVICE DROP TERMINATING ON SUPPORT MAST, 300 Volts or LESS.
NOTES:
1. If 6-feet (4 feet horizontally) or less of service conductor passes over the roof overhang to
2.
3.
4.
5.
attach to a service mast through the roof and the service support is located 4-feet or less from
the roof edge, the vertical clearance of the service can be reduced to 18".
No coupling is allowed in conduit between the weather head and bottom of the soffit.
If the roof has a slope of 4/12 or greater and 6 feet or more of the service conductors pass over
the roof horizontally, then the minimum clearance allowed is 3 feet.
If roof is flat or has a slope less than 4/12 and 6 feet or more of the service conductors pass
over the roof or roof overhang, the minimum clearance is 8 feet.
8-feet minimum clearance is required over any roof that is accessible through a doorway, ramp,
stairway or permanently mounted ladder.
Page174
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
1306. SERVICE MAST INSTALLATION – ROOF CLEARANCES, CLEARANCE OF
SERVICE DROP TERMINATING ON SUPPORT MAST, 300 Volts or LESS Continued
Page175
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
1307. CLEARANCE ENVELOPE FOR GRAIN BINS FILLED BY PORTABLE
AUGERS, CONVEYORS AND ELEVATORS
NOTE:
18 feet of clearance must be maintained in all directions from probe port NESC Rule 232
Page176
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
1308. SPECIAL HORIZONTAL CLEARANCES FOR OVERHEAD CABLE SERVICES.
A. Above-ground Flammable Liquid Storage Tanks and LP Gas Storage Tanks
8' Minimum horizontal clearance
(this requirement does not apply
to LP gas tanks of 1000 gallons
or less).
TANK
B. Gasoline Dispensing and Service Stations
10' Minimum horizontal
clearance.
20' Minimum horizontal
clearance.
Dispenser
Tank Fill-Pipe
3' Min Horizontal or
Vertical clearance
Vent Pipe
C. Wells (Wisconsin Only)
Wisconsin Only
Minimum horizontal clearance
between wells and overhead
conductors shall be at least 3/4
of the required vertical clearance
of the conductor to ground
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Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
D. Antennas (Wisconsin Only)
Antenna System Support – Poles used for electric power or for communication lines may not be
used for supporting or for guying antenna systems.
Setbacks – No wires, cables, or guy wires shall extend over any street or other public
thoroughfare or over any electric power or communication lines.
E. Legally required standby systems (Wisconsin Only)
The enclosure of the alternate source of power located outdoors for legally required standby
systems shall be located at least 10 feet horizontally from any combustible portion of a Type III,
Type IV, or Type V building and at least 20 feet from an outdoor electrical transformer,
electrical metering, service equipment or normal power distribution equipment.
NOTE:
These dimensions may be reduced where a noncombustible barrier is installed that extends at
least 3 feet beyond each side of the alternate power source and transformer. The height of the
barrier shall be at least one foot above the top of the transformer, electrical metering, service
equipment or alternate power source, whichever is higher.
1309. PAD-MOUNT TRANSFORMER LOCATIONS
Alliant Energy shall approve the location of all transformer pads. Pad locations shall be in
accordance with the requirements of NEC, NESC, National Fire Protection Association,
Environmental Protection Agency and any state or local requirements. In addition, they are to be
located far enough from the building overhang so they will not be subject to damage by falling snow
and ice. Pad-mounted transformer locations shall be graded for proper drainage and be readily
accessible by truck or other means for change-out. Where danger of snow plowing or traffic damage
exists, barriers consisting of concrete filled pipe shall be provided for protection.
Transformers shall have a minimum separation of 5-feet from natural gas service equipment. A
minimum separation of 5-feet shall be maintained between transformers and liquid petroleum
facilities on site, but not filled on site. If the liquid petroleum facilities are filled on site, the
minimum separation is 10-feet.
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Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
A. PAD-MOUNT TRANSFORMER LOCATION MAP
Notes:
Zone 1: (Shaded Area) = Minimum distance for pad-mounted transformer up to 100 kVA
Zone 2: Minimum distance for pad-mounted transformers greater than 100 kVA from a combustible building
*Air Intake clearance must also be a minimum of 25 feet diagonal from transformer (not shown).
An oil-collecting sump shall be installed for transformers over 500KVA if the immediate terrain is pitched
toward the building.
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Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
B. Clearance to Doors, Windows and Fire Escapes
C. Clearance to Fuel Equipment
D. Clearance to Combustible and Non-Combustible Walls
Page180
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
Issued Jan 2016
E. Emergency Systems (Wisconsin Only Requirement)
The enclosure for emergency systems shall be located at least 20 feet from an outdoor electrical
transformer, electrical metering, service equipment or normal power distribution equipment.
These dimensions may be reduced where a noncombustible barrier is installed that extends at
least 3 feet beyond each side of the alternate power source and transformer. The height of the
barrier shall be at least one foot above the top of the transformer, electrical metering, service
equipment, or alternate power source, whichever is higher.
F. Non-Combustible Building Walls
Non-Combustible Walls – Are walls where the framing and sheeting materials will not burn and
they will in no way contribute to the burning process.
Metal skinned wood framed buildings are considered to be combustible.
Pad-Mount oil insulated transformers may be located no closer than 3-feet to non-combustible
walls if all of the following clearances are maintained from doors, windows and other building
openings:
1. Doors:
Pad-Mount oil insulated transformers shall not be located within a zone extending
20-feet outward and 10-feet to either side of the building door.
2. Air-Intake Openings:
Pad-Mount oil insulated transformers shall not be located within a zone extending 10 feet
outward and 10 feet to either side of an air intake opening. Transformers may be located
within the zone beneath an air intake opening provided there is a minimum 25 feet diagonal
separation between the transformer and the opening.
3. Windows or Openings Other than Air Intake:
a) Pad-Mount oil insulated transformers shall not be located within a zone extending 10feet outward and 3-feet to either side of a building window or opening other than an air
intake.
b) Pad-Mount oil insulated transformers shall not be located less than 5-feet from any part
of a second story window or opening other than an air intake.
G. Combustible Building Walls
1. Pad-mount oil insulated transformers in sizes up to and including 100 kVA shall be located
according to the provisions set forth in the non-combustible transformers walls section.
2. Transformers greater than 100 kVA shall be located a minimum of 10-feet from a
combustible wall. Also, the clearances from building doors, windows and other openings set
forth for non-combustible walls must be maintained.
3. An oil-collecting sump shall be installed for transformers in sizes exceeding 500 kVA if the
immediate terrain is pitched toward the building.
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ELECTRIC SERVICE RULES
CLEARANCES
1310.
Issued Jan 2016
BARRIERS
If the clearances specified above cannot be obtained, a fire resistant barrier may be constructed in
lieu of the separation. The following methods of construction are acceptable.
A. Non-combustible walls – The barrier shall extend to a projection line from the corner of the
pad-mount to the farthest corner of the window, door or opening in question. The height of the
barrier shall be 1 feet above the top of the pad-mount transformer.
B. Combustible walls – The barrier shall extend 3-feet beyond each side of the pad-mount
transformer. The height of the barrier shall be 1-foot above the top of the pad-mount
transformer.
1311.
FIRE ESCAPES
Pad-mount oil insulated transformers shall be located such that a minimum outward clearance of 20feet and a minimum clearance of 10-feet to either side of the point where the fire escape touches the
ground shall be maintained at all times. If the pad-mount transformer is located under the fire
escape, a vertical clearance of 10-feet shall be maintained.
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ELECTRIC SERVICE RULES
CLEARANCES
1312.
Issued Jan 2016
SINGLE-PHASE, PAD-MOUNT TRANSFORMER PROTECTION
Page183
Chapter 13
ELECTRIC SERVICE RULES
CLEARANCES
1313.
Issued Jan 2016
THREE-PHASE PAD-MOUNT TRANSFORMER PROTECTION
If Required
Non-combustible
fire rated wall or
BLDG. for 3'-0"
dimension
FILLED AND CAPPED
WITH CONCRETE
4" IPS PIPE
SLOPE AWAY FROM PIPE
2'-6"
7'-0"
GROUND LINE
CONCRETE
BACKFILL
3'-0"
5'-0" max.
2'-6"
1'-0"
1'-0"
3'-0"
min.
3'-0"
min.
1'-0"
4'-0" min.
3'-0" min.
Page184
2'-6"
2'-6"
5'-0" max.
ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
CHAPTER 14
ELECTRIC SERVICE RULES – GROUNDING & BONDING
1400. SCOPE
This chapter contains the typical grounding and bonding requirements for all service types listed
within this manual within the Alliant Energy service territories.
1401. GENERAL
A. In accordance with the 2011 and 2014 National Electrical Code (NEC), a permanent and effective
ground shall always be provided for all service entrance equipment. The neutral conductor shall
also be grounded. See section 1402 for examples.
B. The grounding of electric installations is essential for the safety of those using the electric
service, personnel maintaining the service, and is a safeguard for the Customer’s equipment.
C. Intersystem bonding is required by NEC 250.94. See section 1403 for details.
1402. GROUNDING ELECTRODE SYSTEM
Grounding Electrodes NEC 250.52:
1. Metal underground water pipe – NEC 250.52 (A)(1)
2. Metal frame of a building or structure – NEC 250.52 (A)(2)
3. Concrete encased electrode (Ufer) – NEC 250.52 (A)(3)
4. Ground ring – NEC 250.52 (A) (4)
5. Rod and pipe electrodes – NEC 250.52 (A)(5)
6. Other listed electrodes –NEC 250.52 (A)(6)
7. Plate electrodes – NEC 250.52 (A)(7)
8. Other local metal underground systems or Structures – NEC 250.52 (A)(8)
A. If present on the premise at each building or structure served, each item in NEC 250.52 (A) 1-7,
shall be bonded together to form the grounding electrode system. Where none of these
grounding electrodes exists, one or more of the grounding electrodes specified in NEC
250.52(A) (4) through (A) (8) shall be installed and used.
B. The grounding electrode conductor (GEC)
1) The grounding electrode conductor shall not be run through meter sockets, instrument
transformer cabinets, or the utility portion of a metering pedestal.
2) The grounding electrode conductor may be terminated in one of the following:
a) In the service disconnect(s)
b) In the metering equipment containing a service disconnect
c) In the termination compartment of multiple metering installations
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ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
C. Metal underground gas piping systems on the line side of the gas meter shall not be used as a
grounding electrode or bonded to the grounding electrode system.
D. If two ground rods are installed (NEC 250.53(A)(2)), both ground rods shall be installed to the
left or right of meter socket but not in front. The grounding electrode conductor shall not pass
in front of meter-socket or pedestal.
GROUNDING WALL MOUNTED METER SOCKET
Fig. 1402A
GROUNDING INSTRUMENT TRANSFORMER
Fig. 1402B
Page186
Chapter 14
ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
GROUNDING SINGLE SELF CONTAINED WALL MOUNTED SOCKET AND PEDESTAL
Fig. 1402C
GROUNDING FREE STANDING PEDESTALS
Fig. 1402D
Page187
Chapter 14
ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
GROUNDING INSTRUMENT TRANSFORMER CABINETS
Fig. 1402E
GROUNDING FARM SERVICE YARD POLES
Fig. 1402F
NOTES:
1. Pole top disconnect switch grounding conductor and the grounding electrode shall conform to
NEC 250.
2. The customers grounding electrode and grounding electrode conductor shall be completely
separate from Alliant Energy’s transformer grounding electrode and grounding electrode
conductor.
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Chapter 14
ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
1403. BONDING SERVICE ENTRANCE AND METERING EQUIPMENT
A. The electrical contractor is responsible for all bonding connections.
B. The termination cabinet, the CT cabinet and the meter socket enclosure shall be bonded to:
1. The system neutral when they are located on the line side of or at the main disconnect
2. The equipment grounding conductor, when all of the following apply:
They are installed the load side of the main disconnect
b) No service ground-fault protection is installed
c) They are located immediately adjacent to the main disconnect
a)
C. Bonding shall be provided where necessary to ensure electrical continuity and the capacity to
safely conduct any fault current likely to be imposed.
Fig. 1403A - LARGE BUILDING INTERSYSTEM BONDING
The concrete-encased reinforcing rod grounding electrode system is used to bond the electrical
services, communications (2014 NEC 250.94) and lightning system (2014 NEC 250.106), etc.
LEGEND
SE = Service Equipment
M = Meter
- - - = Concrete-Encased Reinforcing Rods
Page189
Chapter 14
ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
Fig. 1403B - LARGE BUILDING INTERSYSTEM BONDING
The grounding electrode bonding jumper (sized according to 2014 NEC Table 250.66) is used to
bond the electrical services (2014 NEC 250.64(D)(2)), communications (2014 NEC 250.94) and
lightning system (2014 NEC 250.106), etc.
LEGEND
SE = Service Equipment
M = Meter
D. Intersystem bonding – CATV, satellite dish systems and telephone companies shall bond to the
grounding electrode system, if available. If the grounding electrode system is not readily
available, bonding shall be done at the ground terminal bar in the main service entrance
equipment (NEC 250.94 (2) or (3) only). In Alliant Energy service territory, the intersystem
bonding shall not be done in or on the metering equipment, refer to Wisconsin PSC 114.099.
E. Meter disconnect switches nominally rated not in excess of 600 volts shall have a short circuit
rating equal to or greater than the available short circuit current. These devices shall also be
grounded and bonded according to parts V and VII of NEC 250.
1404. BONDING CONDUCTOR SIZING
A. Equipment bonding conductors on the supply side of service shall be sized according to NEC
250.102C. ESR Table 1404 may be used as a guide in determining the minimum size for
equipment bonding conductors for metering cabinet installations.
B. ESR table 1404 assumes 75°C temperature ratings for service entrance conductors, with no
adjustment factor for more than three current-carrying conductors. On a 3-phase 4-wire wye
service where the major portion of the load consists of nonlinear (harmonic) loads, the neutral
shall be considered as a “current-carrying” conductor (NEC 310.15(B)(5)(c)); in such cases, a
larger equipment-bonding conductor shall be used.
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ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
Page191
Chapter 14
ELECTRIC SERVICE RULES
GROUNDING
Issued Jan 2016
Page192
*/%&9
AHJ, 3
Grounding 185-190
AIC, 10
Highways, 179
Air Conditioning Systems, 114,164
Holiday Lighting, 146
Application for Service, 3
HUD Manufactured Homes, 113-123
Arc Welders, 161-162
Identification of Conductors, 12
Backup Service, 6
Inspections, 12
Bonding, 15, 54, 72,126,189
Insurance, 52
Box Pad 1PH, 48
Irrigation, 88, 98, 125, 132
Box Pad 3PH, 49
Isolated Building, 8
CATV, 141-145
Isolation, 52
Charges, 3
Line Clearance, 3
Clearance Requirement, 3, 17, 81, 171
Maintenance, 12, 81, 147, 153, 172
Codes, 2
Manufactured Home, 114
Communication Tower, 15
Mast, 28-30, 174
Compliance, 2
Meter Configurations 86, 87, 89-93
Conductors, 5, 7, 12, 28, 35, 84
DG Availability, 51
DG Drawings, 53
Meter Identification, 83
Meter Locations, 14, 53, 84, 95
Meter Seal, 83
Distributed Generation, 51
Meter Shield, 95
Doors, 81, 84, 153
Mobile Home Courts, 160
Driveway, 18, 28, 36
Mobile Home, 114
Easements, 3, 147
Modular Home, 115
Equipment On Customer Premise, 13
Farm Service Yard Pole, 125-136
Farm Services, 125
Motor Specs, 162
Municipal, 141-146
Natural Gas, 172
Fault Current, 10-12, 79,189
NEC & NESC 2, 12, 171
Field Built Structures, 96, 97
Number of Services, 6
Flood Zone Exception, 83
Operation, 52, 153
General Information, 1
Pad Foundation, 44-46
Level Switch, 127
Pad Mount Transformer, 45, 179-184
Grain Bins, 176
Panelized Home, 115
Short Circuit requirements, 10
Point of Service, 2
Sign, 54
Pole Top Transfer Switch, 126, 133-134
Special Conditions, 9
Pools, 36, 173
Power Factor Correction, 53, 161
Pre Cut Home 115
Primary Service Easement, 147
Primary Service Voltage, 147
Primary Service, 147
Special Services, 161-164
Standby Systems 165-170
Storage Tanks, 177
Switchgear, 154
Tanks, 177
Technical Information, 52
Purpose, 1
Temporary Services, 17-25
Revisions, 1
Transfer Switch Options, 126, 165
Rewire, 3
Transformer Location, 45, 179-183
Roofs, 9, 28, 30, 33, 174
Row-house, 9
Rules, 2
SCCR, 10
Service Attachments, 28
Service Capacity, 5,12
Underground Installation, 37
Underground Secondary, 35
Underground Service Application, 35
Underground Service Location, 36
Voltages, 5
Weatherhead, 84, 171,174,
Service Connections, 12
Wells, 177
Service Disconnect Sequence, 14
WiFi, 141
Service Impairing Equipment, 161-164
Service Location, 2-3
Service Mast, 9
Service Voltages, 5
Services to CATV Companies, 141-145
Services to Telephone Companies, 141
Windows, 61
Wire Inspections, 3
Word Applications, 2
Zero Lot Line Buildings, 9
SUPPLEMENTAL INFORMATION TO FOLLOW
Typical Underground Single Phase 120/240 Volt Residential Metering Guidelines
Standard Meter Sockets
200-300 amp
Meter Socket
(Front View)
200-300 amp
Pedestal Type Meter
Socket
(Side View)
Alliant wire
landing lugs
200-300 amp
Meter Socket
(Side View)
Upper lugs for
WP&L connection
5
2
3
8
Common neutral
lugs
36" - 48"
Customer wires
Customer wires
Ground wire
from neutral bus in
Main Disconnect
(Not allowed inside
meter socket)
See Chapter 4 of
Electric Service
Rules
Final Grade
5
18"
6'
Min.
18"
Recommended
1
100-300 Amp
Main
Disconnect
4
Ground rods as required
(Ground wire and clamps
must remain visible until
service is dug in.)
Foundation
Alliant wires
6'
Min.
All grounding must
conform to NEC
250.52
Utility furnishes, installs, and maintains
1. Underground service cable
2. Meter
8
NOTE: All underground services 200 amp or
less require a 200 amp meter socket.
Neutral bus
9
9
LB
Fitting
7
6
8
Ground rods as
required
(Ground wire and
clamps must remain
visible until service
wire is dug in.)
See Electric Service Rules Manual
for additional information
See Electric Service Equipment Book
for approved meter sockets
All residential electric
installations must be
inspected and approved by
authority having jurisdiction
Contact your City, Village or
Township
6'
Min.
2- 8' ground rods
Do not install in
front of meter
socket
18"
1
Customer wires
3
100-300 Amp
Main
Disconnect
Final Grade
18"
Recommended
Customer furnishes, installs,
and maintains
3. Approved meter pedestal
4. Grounding in accordance with the NEC.
(Refer to Chapter 14 Electric Service
Rules)
5. Concrete sleeve (encased in concrete)
Lower lugs for
customer
connection
4
Ground wire
from neutral bus in
Main Disconnect
(Not allowed inside
meter socket)
See Chapter 14 of
Electric Service
Rules
6'
Min.
1
2
Neutral bus
5ft. (+-6")
Customer wire
landing lugs
Wall
200-300 amp
Pedestal Type Meter
Socket
(Front View)
Wall
Pedestal Meter Sockets
All grounding must
conform to NEC
250.52
Customer neutral
to neutral bus
in main disconnect
1
Utility furnishes, installs, and maintains
1. Underground service cable
2. Meter
Customer furnishes, installs, and maintains
3. Customer service entrance panel
4. Rigid conduit (Schedule 80 PVC electrical;
Galvanized steel or Intermediate metal
conduit (IMC)) 2½” for 200A 3" for 300A
5. Approved meter socket
6. Concrete sleeve (only required if conduit
passes through concrete
7. Conduit expansion joint (optional) Required
where horizontal conduit runs are installed.
8. Conduit insulating bushing
9. Conduit straps
10. Grounding in accordance with the code
(refer to Chapter 14 Electric Service Rules)
Page 1 of 2
This information is only a supplement to the Electric Service Rules, The Electric Service Equipment and National Electric Code books.
For complete information about meter sockets and installation go to: www.alliantenergy.com
>utility services>for contractors and trade allies>utility service information>service information manuals>Electric Service Rules & Electric Service Equipment
1phreshandout
Rev.12/11/2015
rmartingilio
Typical Single Phase 120/240 Volt Residential Metering Guidelines
Customer
Service
Entrance
Grounds
(Leave ground wire and top 2" of
ground rods exposed until service
lateral is dug in)
A
Meter
Socket
lli
an
tS
er
Cable route must be with-in 6" of final
grade and a 10' wide clear path before
Alliant Energy will schedule installation
DO NOT
Build over or encase meter socket or service lateral with
a patio, deck or any other structure without contacting
your Alliant Energy Representative first.
vi
ce
La
te
ra
l
Alliant Energy
Pole,Pedestal or
Pad -mount Transformer
UNDERGROUND SECONDARY SERVICE
400. GENERAL
402. LOCATION OF ALLIANT ENERGY SECONDARY VOLTAGE CABLES
A.
B.
C.
D.
E.
F.
G.
The underground service lateral is defined as Alliant Energy’s underground service
conductors from the last pole, pedestal, transformer or other Alliant Energy structure,
connecting to the Customer’s metering point, termination equipment or disconnecting
device. Alliant Energy will install, own and maintain the underground service laterals in
accordance with Alliant Energy’s applicable tariffs and extension rules.
Alliant Energy will not terminate service lateral conductors inside the Customer’s building
or in Customer owned switchgear. The termination point shall be outside the Customer’s
building in either free standing or wall mounted equipment, (self contained meters, CT
cabinets, or a termination box. Alliant Energy will not terminate on a customer’s circuit
breaker.
The Customer shall make application to Alliant Energy for underground service and
obtain approval for the service location, before installing service entrance
equipment. The Customer shall install, own and maintain all service entrance facilities
other than the service lateral, meters, instrument transformers, and instrument
transformer wiring.
All underground service cables shall be protected from physical damage. See
RigidConduit in Section 407. NEC 230.49-50 & NEC 300.5.
All equipment utilized for the termination of Alliant Energy service conductors shall have
provisions which include landing pads and set screw connectors.
Alliant Energy will install a service lateral when the proposed cable route is clear of all
obstructions and within 6 inches of final grade. The Customer shall clear a 10 foot wide
cable route of trees and other obstructions at their own expense.
Grade changes of more than 6 inches over Alliant Energy’s direct buried cables are not
allowed.
401. SIZING UNDERGROUND FACILITIES
Alliant Energy will size underground facilities according to the following:
A. Conduit – Number of conduits sized to customer’s main disconnect.
B. Transformer Pad – NA
C. Underground Conductors – Sized to customer’s load and to meet all voltage drop and
flicker requirements.
D. Transformer – Sized to customer’s load.
A.
B.
C.
Buildings and Pools
Alliant Energy’s cables shall not be located under buildings or pools. Inform Alliant Energy of
plans for future buildings, pools, etc.
Sidewalks, Hard Surfaced Parking Lots, Driveways, Patios and Decks
1. With approval from Alliant Energy, buried cables may be installed in conduit though these
areas, if no other acceptable route exists.*
2. *Exception: Cable runs crossing under sidewalks at 90 degrees may not be required to be
installed in conduit, unless there are other circumstances which would require conduit.
3. With approval from Alliant Energy, a hard surface may be installed over the existing direct
buried cable, provided a conduit with capped ends and tracer/pull wire(s) is/are installed 18
to 24" away and parallel to the existing cable, at a 24 to 36" depth.
4. Conduit, if required, is to be installed by the Customer, or at the Customer’s expense.
Compliance
Whenever a direct buried cable installation is found to be out of compliance with any of the
stated requirements, or in violation of local, state or national codes, the Customer’s
equipment and /or company’s facilities will be modified, at the customer’s expense, to bring
the installation into compliance.
403. UNDERGROUND SERVICE INSTALLATIONS
A.
B.
C.
Service 300 Amps or Less
Alliant Energy will provide trench and cable for all underground services 300 amps or less.
An expansion joint is not required with a vertical conduit run from the meter socket to a depth
of 18". When a horizontal conduit run, such as referred to in 402(B) is required, an expansion
joint is required.
Service Greater than 300 Amps
(See Electric Service Rules Book or contact your Alliant Energy Representative)
The Customer’s service installation shall fully comply with all requirements of the
National Electric Code and those of Alliant Energy.
Page 2 of 2
1phreshandout
Rev.11/16/2015
rmartingilio
THREE PHASE TRANSFORMER PAD/METERING GUIDELINES
3 Phase Secondary Metering Specification 400A-3000A Single Meter
All metering equipment will be installed outdoors
C.T. Cabinet
See Chapter 4 of
Electric Service Equipment Book
Combustible Wall
CLEARANCES
See Chapter 13 ESR 2016 for
additional information.
Contact Alliant Energy for pad
orientation and location.
3' min
10' min.
Mount socket
CL
N
39" Min.
25' Max.
G
F
(max)
24"-30"
400-800A
20"-24"
12003000A
Sleeve
(if encased in
concrete or
asphalt)
Secondary Conduits
C
13"
PAD DIMENSIONS
See Chapter 4 ESR 2016
10' Clear Space
5" Primary Conduits
Contact Engineering for Orientation
Typical Installation
(2) 36" or 48", Schedule 40,
5" PVC 90 degree sweeps,
3 to 4 feet below grade, extending 3' min.
beyond pad. (Plug and mark both ends)
Grounding
&
Bonding
See Chapter 14 ESR
2016
Grounding
Electrode
Multi-meter &
Pad Mounted
Installations
See Chapter 4
ESR 2016
CONTRACTORS
It is your responsibility to read and understand all
specifications in the 2016 Electric Service Rules Book and
the 2016 Electric Service Equipment Book or at
www.alliantenergy.com. that are required by Alliant Energy.
All 3 phase metering equipment will be approved by
Alliant Energy prior to installation.
Send your proposed metering diagram with manufacturer
name and catalog numbers to your Alliant Energy Engineering
Technician/Field Engineering Specialist prior to ordering any
material for approval.
24" min
OPEN
SPACE
FRONT
Cabinet
Bonding
Conductor
& Conn.
Point
Grade
D
Notes:
1"Galv.
Insulating Bushing
Conduit Strap
Rigid Conduit
Expansion Sleeve
Transformer Pad
Top View
E
Neutral
Bus
5' (+/- 6")
above grade
B
A
Service Disconnect
4' Clear working
Bonding
space in front of Conductor
all metering Meter Socket
equipment
6" Min.
Outside Wall
Non-combustible Wall
SECONDARY CONDUIT SPECIFICATIONS
Alliant Energy Engineering will specify which pad is correct for your installation
120/208v 277/480v
A
B
C
D
E
F
G
PAD
THICKNESS
PAD I
100-1200
AMP
100-600
AMP
84"
96"
10"
55"
17"
31"
22"
6"
PAD II
1600-3000
AMP
800-3000
AMP
105"
108"
14"
60"
17"
34"
27"
8"
1. All conduits shall enter through the window opening provided in the pad foundation and
shall be cut off so the top of the conduit is flush with the surface of the pad.
2. All metallic conduits (if installed) shall be fitted with an insulating bushing.
3. When an oil sump is required, excavate 18" under, and around pad and fill with coarse
crushed rock - check with local building code to determine if required.
4. Concrete mix shall have a minimum strength of 4000 lb./sq.in. after 28 days.
5. The top of the pad shall be level and all edges and corners rounded off.
6. The pad shall be reinforced with #4 wire, 4" x 4" welded mesh or equivalent materials
with additional 3/8 reinforcing rods around the cable opening. The mesh shall not be less
than 1" from the edges and opening, and 3" below the surface. If the #4 wire, 4" x 4"
mesh is not available, 2 layers of #10 wire, 6" x 6" mesh, horizontally staggered, may be
substituted.
# of
Conduits
Conduit
Size
Min. Bend
Radius
(steel)
Min. Bend
Radius
(pvc)
400
2
4"
16"
30"
600
2
4"
16"
30"
800
3
4"
16"
30"
1200
5
4"
16"
30"
1600
4
5"
24"
36"
2000
5
5"
24"
36"
2500
7
5"
24"
36"
3000
8
5"
24"
36"
Main Disc.
Amperes
Riser Material will be:
Schd. 80 PVC (electric rated); Galv. Steel or IMC
See Chapter 4 ESR 2016 for complete specifications
12/11/2015
3ph handout.vsd
rmartingilio