Electric Service and Metering
EQUIPMENT GUIDE
REVISION 3.2
Imperial Irrigation District
Energy Department
2013
IMPERIAL IRRIGATION DISTRICT
BUSINESS OFFICE LOCATIONS
COACHELLA VALLEY CUSTOMER SERVICE OPERATIONS OFFICE
81-600 Avenue 58
La Quinta, CA 92253
(760) 398-5841
(760) 391-5944 FAX
IMPERIAL VALLEY CUSTOMER SERVICE OPERATIONS OFFICE
1699 West Main St., Suite A
El Centro, CA 92243
(760) 482-3300
(760) 482-3301 FAX
“Our only business is serving you … better!”
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This Electric Service and Metering Equipment Guide is designed to assist the customer/ contractor
to plan and provide an installation that is proper for the type of electric service supplied to the
customer. As the types of electric service vary, so too must the metering and equipment utilized in
order to properly measure the energy delivered to the customer.
Questions Regarding Metering Equipment
If any question arises, and the answer does not appear to be available in these pages, it is
imperative that you call the Customer Service Operations Office of IID.
Who Provides Metering Equipment
All meter sockets, meter socket enclosures, metering transformer cabinets, and switchboard
service sections will be provided, installed, owned and maintained by the customer. If the
customer wants advanced metering (i.e. pulse metering, modem access, load profile, etc.) The
customer will pay the extra cost to provide this service.
Meter Installation
Meters will be installed and the service connected and energized by the IID after the metering
equipment has been provided and properly installed, and after an inspection clearance has been
given to the IID by the appropriate inspection agency and all outstanding fees paid.
Readily Accessible
Meters and metering equipment will be so placed as to be at all times readily accessible for
inspection, reading and testing. Prior to energizing the service the customer is required to provide
IID with a copy of keys. Lock box will be provided by IID.
As defined by the electrical codes, readily accessible means, “Capable of being reached quickly, for
operation, renewal or inspections, without requiring those to whom ready access is requisite to
climb over or remove obstacles or to resort to portable ladders, chairs, etc.”
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Service and Meter Location
1. Care must be taken in selecting a proper and convenient location for the meter and service
disconnect switch or circuit breaker. The location shall comply with applicable codes, laws
and ordinances of the authorities having jurisdiction of inspection.
2. On new installations, it is necessary that the location for the meter be approved by the IID.
This can be accomplished by the customer or contractor calling the Customer Service
Operations Office and requesting a service and meter location. Meter and service
disconnect location must be approved by the IID.
3. Whenever any addition, alteration or renewal is contemplated to existing service conduits,
service entrance conductors or metering equipment, the customer or contractor shall contact
the Customer Service Operations Office for an approved service and meter location. This is
imperative to provide advice regarding correction of any existing unacceptable condition.
4. Meters and metering equipment may be located at a point other than adjacent to the
overhead service drop attachment or to the underground service terminating enclosure upon
approval by the Customer Service Operations Office of the IID.
Meter Locations – Residential Occupancies
1. For single – and multi-family residential buildings, meters and metering equipment will be
installed outdoors and may be mounted on surface or semi-flush on exterior building wall.
2. In large multi-family residential high-rise buildings, the IID may at its option, establish more
than one meter location for groups of individual meter facilities. Consult the Engineering
Section (Customer Service Operations Office) of the IID for approval of service plans and
meter locations in these cases.
Meter Locations – Commercial and Industrial
1. For single – occupancy buildings, meters and metering equipment may be installed:
a. Outdoors and mounted on surface or semi-flush on exterior building wall
b. In a room within a building approved by the IID for the location of electric meters, with
provision for proper illumination and with access only by a door (with provision for IID
lockbox, customer is required to furnish keys to access door prior to energizing of
panel) opening to the outside of the building.
c. Outside the security gates.
d. Inside the security gates. Access through security gates must be provided to IID by
the customer.
e. The IID reserves the right to install meter/communication equipment.
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2. In multi-occupancy building, extensive shopping centers or buildings exceeding two floors,
the IID may, at its option, establish more than one meter location for groups of individual
meter facilities. Consult the IID Customer Service Operations Office for approval of service
plans in these cases.
Planning and Grouping for Additional Meters
When there is a need to locate and install additional service and metering equipment after the
originally-planned electric service for a building is installed and energized:
1. The additional meters shall be grouped with those meters already in service, and should be
installed in accordance with the established meter location plan for the building.
2. The added service equipment must be located and installed in conformance with applicable
codes, laws, and ordinances of the inspection authority having jurisdiction.
Residential Meter Pedestal
1. A meter pedestal is a structure that supports service equipment. If a meter pedestal is
required for the project, it is the customer’s responsibility to purchase and install it.
2. The NEC requires that manufactured homes have a disconnect switch installed within 30’
from the home on the side of the home facing normal public access. Normally, the meter
socket is installed at this same location.
3. There are two options for meter pedestals:
a. Custom built – standard 181.4 custom built pedestal is one that the customer or
electrical contractor builds. (See page 7)
b. Factory built – standard 181.41 a factory built pedestal is one that is UL approved and
purchased by the customer or contractor. (See page 8)
4. For residential pedestals refer to EUSERC 307.
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Commercial Meter Pedestal
Service Equipment Enclosure Requirements
1. Service equipment enclosure and metering equipment shall meet the requirements of the
Imperial Irrigation District (IID). The meter area shall have a sealable, lockable, weather
tight cover.
2. Service equipment enclosures shall be factory wired and conform to NEMA standards
3. The exterior door shall have provisions for padlocking. The padlock hole shall be a
minimum diameter of ¼” or 11 mm.
4. Landing lugs for incoming service conductors shall be compatible with either copper or
aluminum conductors sized to suit the conductors shown on the plan. Landing lugs shall be
copper or tin-plated aluminum. Neutral bus shall be rated for 125 Amp and be suitable for
copper or aluminum conductors unless otherwise specified. The terminal shall include but
not be limited to:
a. Incoming terminals (landing lugs)
b. Neutral lugs
c. solid neutral terminal strip
5. Voltage ratings of service equipment shall conform to the service voltages indicated on the
plans
6. Meter test bypass facilities will only be allowed if approved by the Imperial Irrigation District
Meter shop in the service area pedestal is being installed. If approved the pedestal shall
have the following additions:
a. Windows for inspection of by-pass blocks
b. Test block area will be locked and only assessable to the Imperial Irrigation District
7. Meter sockets shall be 5 socket clip type which will allow 120/208 volt or 120/240 volt service
8. Maximum height of the pedestal will be 48”
9. Meter Pedestal shall have a Utility Side (Line Side) and a Load Side (Customer Side) that
are separated by non-removable panel.
10. Construction will be NEMA 3R, rain tight
11. All nuts, bolts and screws will be stainless steel
12. Minimum clearance shall be required for front and back of service equipment enclosure per
National Electrical Code, Article 110.26, “Spaces about Electrical Equipment (600 Volts,
Nominal, or Less)
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13. Grounding electrode (ground rod) will be installed on the Load Side (Customer Side) of the
Pedestal, and will be 5/8” x 10’
14. All loads shall be connected after the Utility meter. Meter Pedestals with un-metered loads
will not be energized by the Imperial Irrigation District. Services that are currently metered
and part of the load is un-metered will be changed to metered load
15. Provide Imperial Irrigation District Customer Operations with an application package
including approved street improvement plans, site plan, proposed panel location, panel
voltage and panel main size panel specification, pedestal type, manufacturer, catalog
number, one line schematics, pedestal drawings, etc.
16. Dual and single meter pedestals shall be allowed within the Imperial Irrigation District.
Commercial Meter Pedestal Foundation and Conduit Requirements
1. Foundation shall extend 2” minimum beyond edge of service equipment, 6” minimum above
elevation and 16” in depth. (See attached drawing)
2. Pedestals shall be mounted to the foundation utilizing appropriate mounting materials
utilizing manufacturer approved method. Plan showing mounting method shall be provided
to the Imperial Irrigation District for final approval.
Imperial Irrigation District contact information:
a. Imperial Valley (760)-482-3300
b. Coachella Valley (760)-398-5841
3. Precast pads are not to be used.
4. Conduit shall be: PVC heavy wall schedule 40 for below ground installation and schedule 80
for above ground installation.
5. Conduit will be a minimum of 2” PVC schedule 40 for below ground installation. The PVC
will extend above the foundation 2”
6. Conduit depth shall comply with the Imperial Irrigation District standard which states that
secondary conduit will be 30” below grade, measured from the top of the conduit. Sweep
and riser pipe will be glued
7. 2” conduit shall be provided by contractor for line side used by the Imperial Irrigation District,
the conduit will be placed in the foundation to ensure that when the pedestal is installed the
line side conduit will be in the line side of the pedestal.
8. Load side conduit(s) shall be set at a distance that allows the load side conduit(s) to be
located inside the load side of the cabinet. Line and load side conduits will be placed and
separated by their respective pedestal areas.
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Commercial Meter Pedestal Customer Requirements
1. Customer shall provide detailed drawing of meter pedestal to the Imperial Irrigation District
including model / catalog number, manufacturer name, etc. Meter Pedestal shall be installed
only after approval by appropriate Imperial Irrigation District customer service operations
office, Imperial Valley (760) 482-3300, Coachella valley (760) 398-5841.
2. Customer shall provide an appropriate meter panel wiring diagram that clearly indicates all
customer-service wiring connections are connected on the load side of the meter.
3. Customer shall provide a plan to the Imperial Irrigation District for all streetlight removal.
The Plan shall include:
a. Light-pole number
b. Typical intersection layout
c. Provide notification to the Imperial Irrigation District customer operations office when
new lights are to be energized
4. Customer shall provide letter to IID requesting to remove light(s) from their account as per
streetlight removal plan.
5. For commercial applications refer to EUSERC 308.
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Unacceptable Meter Locations
For reasons of public safety, maintenance of service, reliability of service, and reliability of
metering, it is not permissible to install meters and metering equipment:
a. Inside any individual residential occupancy, carports, or garages.
b. In a substation area or in a transformer vault containing transformers or high-voltage
equipment.
c. In a location not readily accessible for reading, hazardous or unsuitable for entry by meter
readers or service personnel (including alleyways, storage rooms, and pedestrian traffic
areas, etc.)
d. In a restroom, bath, shower, powder, toilet room, etc.
e. In an elevated area (such as a balcony or mezzanine) or a depressed area (such as a
basement, cellar or underground room) that does not have access by means of a ramp or
clear stairway of normal tread and rise conforming to building code requirements.
f. On a surface/place where excessive moisture, vibration, noise, fumes, dust or similar
deteriorating agents will interfere with its operation, unless it is enclosed in a manner
approved by IID.
g. In an alleyway where meter is subject to potential vehicular damage.
h. In a room containing mechanical equipment.
i. Inside any building, unless located within an acceptable meter room.
Meter Markings
Where meters are grouped at a common location for a multiple-occupancy building, either
residential or commercial, each meter socket panel or its related service disconnect shall be clearly
and permanently marked by the contractor or customer, prior to meters being installed, to indicate
the occupancy served. Labeling must be approved by IID.
Meter Heights
When a single meter is wall or surface mounted, either indoors or outdoors, the minimum height of
the meter shall be 5’ (60 inches) and the maximum height shall be 6’ 3” (75 inches). These heights
are measured from the standing surface to the center line of the meter.
Multi-metered packs as measured from finished grade please consult IID Customer Service
Operations Office.
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Working Space in Front of Meter
To permit access to the metering installation and to provide working safety for personnel, a level
working and standing space located entirely on the property of the customer is to be provided for at
all meter installations.
1. The working space, to be kept clear and unobstructed, shall extend a minimum of 3’ (three
feet) from the face of the meter socket or metering transformer enclosure.
2. The width of the working space should permit ready access to the complete metering
installation and in no case be less than 3’ (three feet).
3. The height clearance for the working space should be no less than 6’6” (six feet-six inches).
4. The working space clearance on panels rated 3R with outside doors must be a minimum of
2’ (two feet) clearance beyond the edge of the outside doors when the doors are open and
locked at 90° (ninety degrees) from the panel.
5. When housekeeping pad is more than 2½” (two and one half inches) above final grade, the
pad shall extend a minimum of 3’ (three feet) beyond the leading edge of service entrance
(pull section) and metering sections.
Barricades
Permanent barricades may be required to provide the clearance where the working space is
exposed to vehicles or hazardous conditions.
Meter Locations Requiring Enclosure
1. Whenever the meter is located in any place where excessive moisture, vibration, noise,
fumes, dust or similar deteriorating agents will interfere with its operation, it must be
enclosed or housed in a manner which is approved by the IID.
2. Whenever the meter is mounted in a school, or such a location that is accessible to heavy
pedestrian/student traffic, it must be suitably enclosed or housed. Access must be given to
IID employees. Please consult the IID Customer Service Operations Office, Imperial Valley
(760) 482-3300, Coachella Valley (760) 398-5841.
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Sealing of Meters and Metering Equipment
All meters and enclosures for meters, metering equipment, and service entrance equipment on the
line side of the meter (except as approved for access to replace fuses used for over-current
protection) will be sealed by the IID. The IID seal shall not be broken except by an authorized IID
representative.
No person is permitted to tamper or in any way interfere, with a meter or its connections as placed
by the IID.
Service Riser and Meter Switch
All service and metering installations shall comply with applicable codes, laws, and ordinances of
the inspection authority having jurisdiction.
Meter Socket Requirements
All meter sockets will conform to NEMA-EEI Standard MSJ-7, be Underwriter’s Laboratories
approved and meet Electric Utility Service Equipment Requirements Committee (EUSERC)
requirements.
1. Meter sockets for single-phase, 3-wire, 120/240 volt, service shall be 200 amperes and have
four terminals. For 200 amperes rating 250 KCMIL terminal lugs will be supplied and for 400
ampere rating 300 KCMIL terminal lugs will be supplied.
2. Meter sockets for single-phase, 3-wire, 120/208 volt, service shall be 200 amperes and have
five terminals. For 200 amperes rating 250 KCMIL terminal lugs will be supplied.
3. Meter sockets for three-phase, 4-wire, 120/208 volt-wye and 120/240 volt-delta shall be 200
amperes and have seven (7) terminals. These self-contained service panels will be limited
to 200 ampere rating and be supplied with 250 KCMIL AL-CU terminal lugs
4. Meter sockets for transformer-rated metering will be 20 amperes with terminal arrangement,
depending on the type of service. See table of socket terminal arrangements, Standard 608
on page 18.
Exception
1. 100-ampere sockets for single-phase loads, where load is limited to under 100 amperes
maximum. Contact Customer Service Operations Office.
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Gang-Connection of Self-Contained Meter Sockets
Multiple meter sockets for residential customers may be connected to a single set of service
entrance conductors when the multiple metering equipment is factory bussed and wired.
Self-contained Panels 480 volt
1. If the panel is a self-contained meter panel and has a failure or is damaged by vandalism, it
must be upgraded to a CT panel as IID does not allow self-contained 480 volt meters. The
customer will be responsible for installing the 4 wire CT panel and paying for all costs related to
the new CT panel.
2. IID will upgrade service to 277/480 volt 4 wire as follows:
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IID will upgrade the transformer bank and will install the 4 wire, if feasible.
If the 4 wire is not available, IID will upgrade the transformer bank and will install a
grounding bank.
CT Meter Panels
1. When an existing CT meter panel 480 volt has a failure or is damaged by vandalism, if the
customer can make repairs (breaker, cabling and / or panel accessories replacement only), and
CT meter panel can accept a grounded conductor, IID will provide a temporary grounded
conductor from the existing transformer bank. This will be provided at NO cost to the customer.
This is not a permanent solution and must be addressed by the customer in a timely manner.
2. The customer will be responsible installing the 4 wire CT panel and paying for all costs related
to the new CT panel. The customer must submit an application to upgrade service within 5
working days. It is IID’s intent to expedite the application and design process to limit the
inconvenience caused to the customer.
3. IID will upgrade service to 277/480 volt 4 wire as follows:
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
IID will upgrade the transformer bank and will extend the 4 wire, if feasible.
If the 4 wire is not available, IID will upgrade the transformer bank and will install a
grounding bank.
4. If an existing CT meter panel 480 volts has a failure or is damaged by vandalism, and the panel,
bus bar and mounting brackets are damaged, it will be considered non-repairable and the
customer will be required to upgrade to a CT panel that meets IID standards. The upgrade will
consist of a new CT panel 4 wire upgrade.
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5. IID will upgrade service to 277/480 volt 4 wire, as follows:
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IID will upgrade the transformer bank and will extend the 4 wire if feasible.
If the 4 wire is not available, IID will upgrade the transformer bank and will install a
grounding bank.
Transformer-Rated Meters
When the electrical supply needs of the customer exceed the capacity of the self-contained meter,
current transformers which connect to the service entrance conductors will be used. For voltages
of 277 and above, potential transformers will be used to reduce the voltage to the transformer-rated
meter.
The transformer-rated meter, when inserted in its socket, is connected directly to the instrument
transformers, and an instrument transformer rated multiplier is applied to the billing register of the
meter.
The customer furnishes and installs an approved current transformer panel. This can be either an
EUSERC approved stand-up panel or a wall mounted EUSERC approved instrument transformer
combination metering can. Refer to pages 21 & 22.
Instrument Transformer Combination Metering CT Can
When the electric service does not exceed 400 amperes, a combination CT/Meter can is one type
of enclosure which the customer may furnish to house metering equipment. The IID will furnish and
install the necessary metering equipment (i.e. CT’s, PT’s, test switch, meter, etc.) The customer
must use the 50,000 AIC rated current transformer mounting base within the enclosure.
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Metering Related Notes
1. Panel drawings with appropriate EUSERC numbers must be submitted for approval for all
CT rated panels. IID Distribution Engineering staff must approve fault current ratings of
panels. Contact IID Customer Service Operations Office
2. Panel drawings with appropriate EUSERC numbers must be submitted for all self-contained
multi-metered panels. Fault current rating of panel must be approved by IID Distribution
Engineering staff. Contact IID Customer Service Operations Office
3. Consult EUSERC acceptability sheets for IID metering requirements per the EUSERC
numbers. See page 28.
4. Bussing from the pull section through the metering section must be density rated per UL-891
and such material used shall be specified on submitted panel drawings.
5. CT metering at the customer’s EUSERC approved panel is the normal practice, with
metering at the pad mounted transformer as an exception subject to approval.
6. Bottom fed panels are acceptable up to 1,000 amperes. For panels above 1,000 amperes,
there must be a full height pull section.
7. All stand-up panels must be bolted down securely to the foundation beneath it.
8. On 277/480-volt CT panels rated 1,000 amperes or above, the service disconnect must have
a ground fault device per NEC 230-95. Prior to panel being energized, there must be a
certified test on site of ground fault device in service disconnect per NEC 230-95. A copy of
the field test should be sent to applicable distribution supervisor and Imperial Irrigation
District meter shop.
9. IID does not allow 277/480-volt self-contained metering. All 277/480-volt services will
require instrument transformer metering installed (CT and PT metering) All new 277/480 –
volt services will require instrument transformer metering installed (CT and PT metering).
Existing 480 volt 3 – wire services that are upgraded or for some other reason must be
replaced or rebuilt, shall be upgraded to 277/480 volts, 4 – wire wye service.
Existing idle 480 volt 3 – wire services that have not been active for 12 months or longer will
be removed from service. The customer will be responsible for upgrading to 277/480 volts, 4
– wire wye service when the reconnection is requested.
10. Each CT rated panel will require its own individual single main disconnect, in series with
panel busing, which is pad lockable.
11. IID will not accept fusible pullout cartridges in the main disconnect device.
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12. 400 ampere rated panels for class 320 meters are for residential use only
13. Residential pedestals cannot be used on commercial accounts. Commercial customers
must use commercial type pedestals.
14. On Medium Voltage Panels (over 1000 volts), in addition to submitting all applicable
EUSERC drawings, such as; 401 High Voltage, 402 Mounting Pattern for Instrument
Transformers, 403 Hinged Meter Panel with single socket, 408 indoor Current Transformer
Dimensions, and 411 Underground Service Terminating Pull Section.
An insulated safety barrier must be installed in front of the section with current transformers.
The main disconnect device on Medium Voltage Panels are to be located after the Meter
Section.
15. The main disconnect switch for a meter must be readily accessible within 6’ (six feet) of the
meter. On existing meter cans, if the installation is de-energized for repairs, this panel must
be in compliance before the meter will be re-energized.
16. Customer equipment, load wires, load management equipment, etc. are not allowed in the
unmetered sections of the panel including pull and metering section. Taps for fire alarms
and fire pumps are not allowed in the pull section and or CT-Metering section of a panel.
17. Ringless meter panels are not acceptable. This applies to all residential and commercial
meter panels.
18. ANSI C84-1 recommends utilities maintain voltage of ±5% nominal voltages (120, 208, 240,
277, 480 voltages).
19. For installations requiring metering of the customer generated power, (non-revenue
submetering) the requirements for self-contained and CT rated panels will be the same as
regular revenue metering listed in this guide. (Refer to Net Metering Guide for further
information)
20. Customers installing Automatic Transfer Switches (ATS) or Manuel Transfer Switches
(MTS) must include a one-line diagram, an operation scheme, and equipment specifications
including ATS and MTS equipment specifications. All documents are to be provided to the
IID Project Manager in the Customer Operations Unit of the Energy Department.
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Existing home remodeling, additions or manufactured homes
The most common service alterations are an upgrade to the electric service panel.
Upgrades are generally needed when a family exceeds its existing service due to
remodeling, room additions, or installation of a new major electric appliance. Another
common upgrade of electric service involves moving the overhead service drop
underground. This is generally done as a safety precaution when families decide to add
a backyard pool, deck or patio, or simply to improve aesthetics. The customer shall
carry the responsibility to ensure the project of upgrading the electrical service panel
complies with the most recent issue of the National Electric Code and any other federal,
state, or local codes that apply. Once the customer’s service equipment is installed, the
county or the city with jurisdiction requires that the installation pass an electrical
inspection before the IID can complete the connection to the electrical system. The
customer is responsible for requesting and passing this inspection.
Overhead service drawing, standard 206.12 “Overhead Secondary Single / Three
Phase” (page 28)
Underground service drawing, standard 181.411 “Underground Secondary Single”
(page 29)
For manufactured homes, please see page 6, “Residential Meter Pedestal”
If you are looking to make this type of a service change or alteration, you will be
required to follow your city or county building department requirements prior to
contacting the IID. It is the customer’s responsibility to be aware of any applicable local
codes and ordinances.
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EUSERC # 301
EUSERC # 301A
EUSERC # 302
EUSERC # 302A
EUSERC # 302B
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REVIEWED APPROVED REVISION DATE REV 01 4‐22‐2013 619 30
Electric Service and Metering
Equipment Guide
TYPICAL
INSTALLATIONS
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Electric Service and Metering
Equipment Guide
TYPICAL
FIELD
APPLICATIONS
Photographs
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Electric Service and Metering
Equipment Guide
TYPICAL
NET ENERGY
METERED
INSTALLATIONS
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NET ENERGY METERING
California Assembly bill 920, passed in late 2009, expands the state’s net metering
program, requiring utility companies to establish a standard contract, or tariff, by 2011 to
compensate net energy metering customers for generating excess electricity produced
by eligible solar or wind power systems. The law caps the energy derived from net
energy metering customers at 5 percent of the utilities’ peak demand.
For customers considering a self-generating facility (GF), referred to as Net Energy
Metering (NEM). The following process should be followed to interconnect your
equipment legally and safely with IID’s electric system and to ensure that you begin
receiving all benefits of operation from such a system:
Application for Interconnection
An application must be filled out and all requested information provided in the
application. The application includes a general description of the system to be
interconnected including the brand name and model of the generators and inverter
system to be used. This will help ensure the disconnection of the generation facilities
when required by IID’s field service employees. (See IID website
http://www.iid.com/index.aspx?page=621)
Interconnection agreement for net energy metering for residential and commercial solar,
wind or other generating facilities of one (1) megawatt or less.
The interconnection agreement is required for a generating facility that will be
connected to IID’s system.
Interconnection Application Requirements (current requirements, forms, check sheets
and examples can be found at www.iid.com
54
Requirements (AC nameplate <10 kW)







To Reduce the review and processing time of your Milestone Form, please use
the following checklists to verify your application is ready to be submitted to IID
o Checklist (go to attached)
o One-line diagram (w/local jurisdiction approval) example and checklist (go
to attached)
o Site Plan (w/local jurisdiction approval) example and checklist (go to
attached)
Bill of Materials (go to attached example)
AC Disconnect cut sheet
Inverted Manual
Interconnection Application
Two signed copies of NEM Agreement
Customer Service Proposal (CSP) Application
o Bi-Directional Meter Fee
 Pursuant to PU Code 2827, “If the existing electrical meter of an
eligible customer-generator is not capable of measuring the flow of
electricity in two directions, the customer-generator shall be
responsible for all expenses involved in purchasing and installing a
meter that is able to measure electricity flow in two directions. “The fee
will vary according to the project size”
Requirements (AC nameplate ≥ 10 kW)









To reduce the review and processing time of your Milestone Form, please use
the following checklists to verify your application is ready to be submitted to IID
o Checklist (go to attached)
o One-line Diagram (w/local jurisdiction approval) example and checklist (go
to attached)
o Site Plan (w/local jurisdiction approval) example and checklist (go to
attached)
Rule 21 Application systems > 10 kW)
o Guidelines
(http://www.iid.com/Modules/ShowDocument.aspx?documentid=7775)
Bill of Material (go to attached example)
AC Disconnect cut sheet
Inverter Manual
Interconnection Application
Two signed copies of NEM Agreement
Customer Service Proposal (CSP) Application
o Bi-Directional Meter Fee 201
Pursuant to PU Code 2827, “If the existing electrical meter of an eligible
customer-generator is not capable of measuring the flow all expenses involved in
purchasing and installing a meter that is able to measure electricity flow in two
directions.” The fee will vary according to the project size.
55
Existing and New Customer PV Panel Provisions
Interconnection of (PV) photovoltaic system involves many complex technical and
operational aspects. Today, several PV technologies are available and many more are
on the way. With so many connections possible, it is a daunting task to create an
interconnection standard that will address all PV available in the market.
So, IID decided to create a minimum functional requirement that will enhance the safety
of the public and employees, reliability of the system, and the protection of the
equipment with minimal cost.
Line side taps on existing panels that are not properly equipped for line side taps shall
not be accepted. Customer will be required to upgrade the panel to a UL
listed/approved panel designed to supporting line side taps. Existing panels that are not
capable of supporting line side taps may be utilized providing a load side breaker can
be installed to support the Distributive Generation (DG).
New panels or new construction customers adding DG a UL listed/approved panel
designed to support line side taps shall be installed.
The applicants are encourage to observe the list of common code compliance issues for
PV systems based on the requirement of current NEC and industry standards. This is
intended as a guide for PV system designers, installers, inspectors, and operators.
However, this list does not include every potential requirement and the user should
reference all other relevant documentation to ensure compliance.
Existing panel: customers adding DG to existing panels at residential or business
buildings shall be required to follow the following rules:
GENERAL PRACTICES AND COMPONENT
 Equipment Approval, UL 1703 listing for modules and UL 1741
NEC Articles; 110.2, 690.4(D) & 690.60.
 Manufacturer’s Instructions.
NEC article; 110.3(B)
 Site Drawings
 Electrical Diagram
 Array Mounting Information
 Owner’s Documentation
 AC Modules NEC articles; 690.6 & 690.52
 Stand-Alone Inverter Output NEC article; 690.10(A)
 Local Building Permit
56
CIRCUIT VOLTAGE AND CURRENT REQUIREMENTS
 Maximum System Voltage NEC article; 690.7(A)
 600 V Limit NEC article; 690.7(C) & 690.7(D)
 Maximum PV Current NEC article; 690.8(A)(1) & 690.8(A)(2)
 Inverter Current NEC article; 690.8(A)(3) & 690.8(A)(4)
 Equipment Maximum Voltage NEC article; 690.7 & 110.4
CONDUCTORS AND WIRING METHODS
 Conductors and Wiring Methods NEC article; 300 & 690.31(A)
 Conduit NEC article; 690.31(A)
 PV Source-Circuit Wiring NEC article; 690.31(B)
 PV Conductors Alone NEC article; 690.4(B)
 Ampacity NEC articles; 690.8(B), 310.15(B) & 310.16
 Flexible Conductors NEC article 400.5, 690.31(C) & 400.5
 Small Conductors NEC article 690.8, 690.31(D) & 310.15
 PV Source-Circuit Conduit NEC article; 690.31(E)
 Connectors NEC article; 690.33
 Wiring Connectors NEC article; 101.14
 Junction Boxes NEC articles; 690.34 & 314
 Color Codes NEC article; 310.12
 Strain Relief NEC article; 300.4
 Multiwire Branch Circuits NEC article; 90.10(C)
OVERCURRENT PROTECTION
 Protected Circuits NEC Article 240, 690.9(A) & 240
 Multiple Power Sources NEC article; 690.9(A)
 Ratings NEC article 690.8(A), 690.8(B) & 240.4
 Transformers NEC article 450.3, 690.9(B) & 450.3
 Supplementary Overcurrent Protection NEC article; 690.9(C)
 Listed for DC NEC article; 690.9(D)
DISCONNECTS
 Array Disconnect NEC article; 690.13
 Accessibility NEC articles; 690.14(C)(1) & 690.31(E)
 Marking NEC articles; 690.14(C)(2) & 690.14(C)(3)
 Grouping NEC articles; 690.14(C)(4) & 690.14(C)(5)
 Equipment Disconnects NEC article; 690.15
 Fuses NEC article; 690.16
 Features NEC article; 690.17
57
GROUNDING
 Ungrounded Systems NEC article; 690.35
 Module Grounding Continuity NEC article; 690.4(C)
 Ground-Fault Protection NEC article; 690.5
 PV System Grounding NEC articles; 690.41 & 250.4(A)
 Single-Point NEC article; 690.42
 Equipment Grounding NEC article; 690.43
 Equipment Grounding Conductors NEC article; 690.43
 Equipment Grounding Conductor Size NEC articles; 690.45 & 250.122
 Grounding Electrode Systems NEC articles; 690.47(A); 690.47(B) & 250
 Common Grounding NEC articles; 690.47(C) & 250
 Array Grounding
MARKINGS AND LABELS
 Array Ground-Fault Protection NEC article; 690.5(C)
 Modules NEC article; 690.51
 System Info at DC Disconnect NEC article; 690.53
 Inverter Info at AC Disconnect NEC article; 690.54
 Batteries NEC article; 690.55
 Stand-Alone Systems NEC article; 690.56(A)
 Interactive Systems NEC article; 690.56(B)
 Single 120 V Supplies NEC article; 690.10(C)
 Ungrounded Systems NEC article; 690.35(F)
 Disconnect Energized While Open NEC article; 690.17
 Marking NEC article; 690.64(B)(4)
 Back-Fed Breakers NEC article; 690.64(B)(7)
CONNECTION TO IID
 Inverters UL Listed NEC article; 690.60 & Underwriters Laboratories article
UL1741
 Islanding NEC article; 690.61
 Neutral Loading NEC article; 690.62
 Unbalanced Interconnections NEC article; 690.63
 Point of Connection NEC article; 690.64
 Load-Side Connection NEC article; 690.64(B)(1)
 120% of Busbar Rating NEC article; 690.64(B)(2)
 GFCI NEC article; 690.64(B)(3)
 Suitable for Backfeed NEC article; 690.64(B)(5)
 Back-Fed Breakers NEC article; 690.64(B)(7)
58
BATTERIES AND CHARGE CONTROL
 General NEC articles; 690.71(A) & 480
 Voltage Limit for Dwellings NEC article; 690.71(B)(1)
 Covers/Access NEC articles; 690.71(B)(2) & 480.9
 Fuses NEC article; 690.71(C)
 Cases and Racks NEC article; 690.71(D)
 Series Disconnects NEC article; 690.71(E)
 Maintenance Disconnect NEC article; 690.71(F)
 Charge Control NEC article; 690.72(A)
 Diversion Charge Control NEC article; 690.72(B)(1)
 Diversion Loads NEC article; 690.72(B)(2)
 Interactive Systems NEC article; 690.72(B)(3)
 Battery Wiring NEC articles; 690.74 & 400
59
Application for Interconnection—Application Package Check-Sheet
Date Reviewed:
To reduce the time it takes to review and process your application, please use the following check-sheets and examples to verify
your application is ready to be submitted to IID.
Once you have verified your application is ready to be submitted using the following check-sheets, please email all required
documents to solar@iid.com (If you are submitting this as part of the Milestone Stage in IID’s PV/Solar Solutions rebate program, all
documents must be uploaded to Power Clerk).
1
Verify package is complete:
•
One-line diagram
•
Site-plan diagram
•
Application for Interconnection:
o if < 10 kW: one-page Application for
Interconnection
o if ≥ 10 kW: Rule 21 Application
•
Bill of Materials
•
AC Disconnect cut sheet
•
Inverter manual
•
NEM Agreement
•
CSP Application
7
Verify Bill of Materials (BOM) is complete & matches all
other documents
8
Verify a Net Energy Metering (NEM) Agreement is
completed correctly and completely (including correct
account and meter numbers, correct site address,
person-who-signs’ name is on IID account) and signed
and dated by host customer on page 7 and Appendix B.
2
Verify the following are correct on all documents:
•
host customer name (must be on IID account)
•
site address
•
contract account number
•
IID meter number
9
Verify a Customer Service Proposal (CSP) Application is
completed correctly. Please use instructions included in
the CSP Application.
3
Verify installer’s contractor’s license (CSLB) is current
(A, B, C-10, or C-46).
https://www2.cslb.ca.gov/onlineservices/checklicenseII
/checklicense.aspx
10
Verify solar panels:
•
Are CEC approved: www.gosolarcalifornia.org
4
Application for Interconnection:
•
If project is < 10 kW: verify the one-page
Application for Interconnection is completed
correctly.
•
If project is ≥ 10 kW: use the Rule 21 checksheet below to verify the Rule 21 Application
for Interconnection is completed and meets
requirements.
11
Verify inverter(s):
•
Is CEC approved: www.gosolarcalifornia.org
•
A copy of the correct Inverter Manual(s) to
submit as part of the application package.
5
Use “Electrical One-Line Diagram Check Sheet” and
example one-line diagram below to verify the one-line
diagram meets requirements.
12
Verify AC Safety Disconnect:
•
Meets IID’s Rule 21 standard (all
interconnections)
•
A copy of the AC Disconnect cut sheet to
submit as part of the application package.
6
Use “Site-Plan Diagram Check Sheet” and example siteplan below to verify the site-plan diagram meets
requirements.
13
Once all required documents are complete and verified
correct using this check-sheet, to submit application for
interconnection, please email all documents to
solar@iid.com
60
Electrical One-Line Diagram Check-Sheet
Date Reviewed:
Please verify your one-line is ready to submit by using this check-sheet and the example one-line below.
1
2
General:
Diagram is legible and all text and symbols are
visible (not obscuring each other). Hand-drawn
drawings will not be accepted.
Diagram is a one-line diagram (three-line diagrams
are not accepted)
The following are included on the diagram:
System summary, system size DC, system size
CEC-AC
Drawing number
Version & date
Customer information, including site address
Contractor information
Stamped with local permit jurisdiction approval
(AHJ)
Electrical PE stamp (required if ≥ 10 kW)
Verify the host customer & site address, and meter
number are correct and match other documents.
Verify all the electrical components are visible and
properly connected to each other (must be consistent
with Site-Plan and Bill of Materials (BOM)):
Main and sub-panels (if applicable)
inverter(s)
AC disconnect
IID meter
IID transformer, and
If applicable: switchgear, customer transformer,
non-PV components
Connectivity lines correctly illustrate the electrical
relationships between components
Wire sizes are shown (including ground wires)
3
Verify solar panel information is shown & matches SitePlan and BOM for each array:
Number of panels
Total DC output of array
Brand and model number
CEC-AC rating (watts)
4
Verify inverter(s) information is shown & matches SitePlan and BOM:
Brand and model
Capacity
5
Verify AC Safety Disconnect info is shown & matches
Site-Plan and BOM:
Capacity
Brand
Model
6
Verify for load-side tap:
connectivity lines correctly illustrate the electrical
relationships
breaker and rating shown
sub-panel or junction box shown (if applicable)
7
Verify Service Panel:
connectivity lines correctly illustrate the electrical
relationships
correct symbols (see example drawing below)
Ampacity
AIC rating
Voltage
Number of wires
Number of phases
Specify which phase(s) (if applicable)
Main and Solar breaker ratings are shown
8
Verify for line-side tap:
connectivity lines correctly illustrate the electrical
relationships
Net Generation Output Meter (NGOM)
sub-panel or junction box
9
Verify IID meter:
connectivity lines correctly illustrate the electrical
relationships
correct bi-directional meter one-line symbol
existing IID meter number and number and the text:
“Proposed Bi-Directional meter ______________” (see
example one-line below)
secondary metering PTs and CTs (if applicable)
primary metering PTs and CTs (if applicable)
10
Verify IID transformer symbol and information is on diagram:
(request transformer information from solar@iid.com )
correct ANSI one-line transformer symbol:
is designated overhead (OH) or
underground (UG)
IID transformer number
Capacity (kVA)
Phases: 1Φ or 3Φ
If single phase, states phase (A, B, or C)
High voltage side: voltage and connection type
example: “High: 7.2 kV” [single phase]
example: “High: 7.2/12.47 kV grounded open wye”
Low voltage side: voltage and connection type
example: “Low: 120/240 V” [single phase]
example: “Low: 120-240 V open delta”
11
Verify stand-by generator (if applicable):
connectivity lines correctly illustrate the electrical
relationships
brand and model
correct symbols
capacity
voltage
phase
Automatic Transfer Switch (ATS) ampacity
Manual Transfer Switch (MTS) ampacity
subpanel
61
Site-Plan Check-Sheet
Date Reviewed:
Please verify your site-plan is ready to submit by using this check-sheet and the example site-plan below.
1
General:
6
Verify for load-side tap:
connectivity lines correctly illustrate the electrical
relationships
sub-panel or junction box
7
Verify Service Panel:
connectivity lines correctly illustrate the electrical
relationships
correct symbols (see example drawing below)
Ampacity
AIC rating
Voltage
Number of wires
Number of phases
Specify which phase(s) (if applicable)
Solar breaker rating is shown
Verify all the electrical components are visible and properly
connected to each other (must be consistent with One-line
and Bill of Materials (BOM)):
Main and sub-panels (if applicable)
inverter(s)
AC disconnect
IID meter
IID transformer, and
If applicable: switchgear, customer transformer,
non-PV components
Connectivity lines correctly illustrate the
electrical relationships between components (if
needed)
8
Verify for line-side tap:
connectivity lines correctly illustrate the electrical
relationships
Net Generation Output Meter (NGOM)
sub-panel or junction box
9
Verify IID meter:
connectivity lines correctly illustrate the electrical
relationships
existing IID meter number and number and the text:
“Proposed Bi-Directional meter ______________”
(see example site-plan below)
3
Verify solar panel information is shown & matches One-line
and BOM):
Number of panels
Brand and model number
10
4
Verify inverter(s) information is shown & matches Site-Plan
and BOM):
Brand
Model
Capacity
Verify IID transformer symbol and information is on diagram:
(request transformer information from solar@iid.com )
correct site-plan transformer symbol. See example
site-plan for overhead (OH) or underground (UG).
IID transformer number
Capacity (kVA)
Phases: 1Φ or 3Φ
If single phase, states phase
High voltage side: voltage and connection type
Low voltage side: voltage and connection type
5
Verify AC Safety Disconnect info is shown & matches SitePlan and BOM):
Brand
Model
Verify meets Rule 21 & NEM Requirements,
(including: it is within 15’ of service meter panel
and within plain site of meter).
11
Verify stand-by generator (if applicable):
connectivity lines correctly illustrate the electrical
relationships
brand and model
capacity
voltage
phase
Automatic Transfer Switch (ATS) Ampacity
Manual Transfer Switch (MTS) Ampacity
subpanel
Diagram is legible and all text and symbols are
visible (not obscuring each other). Hand-drawn
drawings will not be accepted.
The following are included on the diagram:
System summary, system size DC,
system size CEC-AC
Drawing number
Version & date
Customer information, including site
address
Contractor information
Stamped with local permit jurisdiction
approval (AHJ)
Electrical PE stamp (required if ≥ 10 kW)
Verify the host customer & site address, and
meter number are correct and match other
documents.
2
62
Customer Customer Name & Address
Output rating KWAC
Date
Rule 21 Application
PART
Notes
SECTION
A
B
Operating mode option mark
Agreement option mark
Maximum kW
Protection option mark
3
C
Continues current rating
Minimum load of customer facility
D
4
Maximum fault current contributed by GF at PCC
Short circuit interrupting rating service panel
E
How this Generating Facility will be operated option mark
A
Generator/Inverter Manufacturer (Name)
B
Generator/Inverter Model (Name/Number)
C
Generator/Inverter Software Version (Number)
D
Is the Generator Certified
E
Generator Type
F
Gross Nameplate Rating (KVA)
G
Gross Nameplate Rating (KW)
H
Net Nameplate Rating (KW)
I
Operating Voltage
J
Power Factor Rating (%)
K
PF Adjustment Range (%)
L
Wiring Configuration
M
Three-Phase Winding Configuration
N
Neutral Grounding System Used
Synchronous Reactance
O
Transient Reactance
Subtransient Reactance
Locked rotor current
Stator Resistance
P
Stator Leakage Reactance
Rotor Resistance
Rotor Leakage Reactance
Q
R
S
Short Circuit Current Produced by Generator
In-Rush Current
Continuous Current Rating
Prime Mover Type
63
BILL OF MATERIALS
Solar Photovoltaic System Installation at
John Adams - Residence
2211 Anglewood Drive
El Centro, CA 92243
No.
Description
1
220-watt solar modules
2
5200-watt inverters
3
AC Fused General Duty
Disconnect Switch in Nema
3R Enclosure, 60A, 240
VAC
4
DC Breaker, 10A
5
AC Solar Subpanel
125-Amp, NEMA 3R
Enclosure
6
30A, 2-Pole AC breaker
7
30A, 250V fuse, 20,000 AIR
8
60A, 2-Pole AC breaker
9
Roof-Trac solar mounting
rack system
Vendor
Part No.
Sun4You
SSB-220
Sun4You
SSB-5200
General Electric TG3221R
Quantity
51
2
1
Power2You
SW Supply
SGOB-PV10
BR816L125RP
6
1
SW
SW
SW
SW
BR230
TR60R
BR260
R-136-6
2
2
1
14
Supply
Supply
Supply
Supply
Effective February 20, 2013
64
65
66