SECTION 16425 - DISTRIBUTION PANELBOARD
PART 1 - GENERAL
1.01
RELATED DOCUMENTS
A.
1.02
DESCRIPTION
A.
Description: Provide factory-assembled, dead-front distribution
panelboard with main breaker for service entrance (Panel MDP) from line
terminals to outgoing feeder terminals, complete, installed, and tested in
place.
B.
General: Panelboard shall include all main and branch protective devices,
related equipment as required or as listed on drawings, with all necessary
interconnections, instrumentation, control wiring, etc.
C.
1.03
General: Drawings and general provisions of the Contract, including
General and Supplementary Conditions and Division 1 Specification
sections, apply to work specified of this section.
Manufacturer: Square-D I-‘Line, Westinghouse Pow-R-Line 4 or G.E.
Spectra Series.
DISTRIBUTION SWITCHBOARDS QUALITY ASSURANCE
A.
ANSI: The latest edition of the Reference Standards for the American
National Standards Institute shall apply as follows;
1. ANSI Y32.2 - Graphic Symbols for Electrical and Electronic
Diagrams.
2. ANSI Z55.1 - (R1973) Gray finishes for Industrial Apparatus and
Equipment.
3. ANSI C57.13 - Instrument transformers
B.
NEMA: National Electrical Manufacturers Association shall apply as
follows;
1. NEMA PB1-1984, Panelboards.
2. NEMA AB1, for molded case circuit breakers and switches.
3. NEMA PB1-57 gutter space.
C.
NFPA: The latest edition of the National Fire Protection Association shall
apply as follows;
1. NFPA 70, National Electrical Code (NEC).
2. Refer to Section 16010 for additional references.
DISTRIBUTION SWITCHBOARDS 16425-1
D.
UL: The latest edition of the Underwriters' Laboratories, Incorporated shall
apply as follows;
1. UL Electrical Construction Materials List Panelboards-dead front
type
2. UL 67 Panelboard wiring gutter space, bus heat rise test.
3. UL 50 Cabinets – Rigidity and gauge of steel.
4. UL 489 Molded case circuit breakers.
E.
1.04
Listing: Panelboards shall be listed by Underwriters Laboratories and bear
the UL or other nationally recognized testing laboratory label. Where
required, panelboards shall be listed for use as service entrance
equipment.
SUBMITTALS - DISTRIBUTION SWITCHBOARDS
A.
General: Submit layouts showing concrete pad dimensions (where
applicable), conduit entrance and available space, bus duct connections,
electrical rating, nameplate nomenclature, single-line diagram (in
accordance with ANSI Y32.2) indicating all connections and control.
B.
Shop Drawings: Shop Drawings shall be submitted for main distribution
panelboard (UDP) and shall clearly indicate all of the following information;
Enclosure elevations, studs and details.
Complete Construction Information
U.L. Label
Each overcurrent device amperage rating, circuit number and
position/location in the panelboard.
5. Electrical characteristics
6. Dimensions, (width, depth, height, weight)
1.
2.
3.
4.
7. Frame size, rating and interrupting capacity of each breaker, and of
total assembly.
8. Horsepower rating at rated voltage of fused switches and/or breakers.
9. Size and type of fuses being provided.
10. Ranges of all meters (all meters shall be analog unless otherwise
noted).
11. Type of labeling for each overcurrent device and load (Provide at least
one sample with shop drawing).
12. Equipment nameplate indicating project name; Architect, Engineer
and Contractor.
13. Product data for panelboard mounted transformers; or other
specialties clearly and/or separately called out in the contract
documents.
14. Bus bar size, type arrangement and spacing (Phase, neutral and
ground bar).
DISTRIBUTION SWITCHBOARDS 16425-2
15. Transparency log paper time current curves for protective relays,
current and potential transformer excitation and saturation curves, and
fuses.
16. Protective relay instruction books.
17. Shipping sections.
18. Lug sizes for cables on all switches or breakers.
19. Incoming lug sizes.
1.05
C.
Product Data: Manufacturer's written recommendations for storage,
protection, handling, installation instructions and field test requirements.
Record all field tests, itemize data and submit at end of project with project
manual.
D.
Test Reports: Reports of production and field tests.
E.
Operations and Maintenance Data: Provide and comply with manufacturer's
instructions for tightening bus connections, performing cleaning, operating
and maintaining switchboard.
PRODUCT DELIVERY, STORAGE AND HANDLING
A.
Handling: Only lift panelboard using eyes, yokes, and skids provided by
manufacturer.
B.
Storage: Do not store indoor switchboard exposed to weather.
C.
Protection: Physically protect switchboard against all damage. Cover
switchboard with suitable material to avoid damage to finish.
PART 2 - PRODUCTS
2.01
MAIN SECTION
A.
General: The main disconnect device shall be as specified herein and shall
be totally front accessible and front connectable. Main device shall be
provided with ground fault protection, shunt trip. Main circuit breaker shall be
solid-state with adjustable settings for long-time, short time, instantaneous,
long-time delay and short time delay.
B.
Digital Line Metering and Protection System: Provide a digital line metering
and protection system in each switchboard. The device shall display the
functions listed below:
METERED VALUES
(Accuracy)
AC Phase Amperes (1%)
AC Phase Voltage (1%)
Watts, (2%)
DISTRIBUTION SWITCHBOARDS 16425-3
PROTECTIVE FUNCTIONS
Voltage Phase Loss (less than 50% rms)
Current Phase Loss (1/16 largest phase)
Phase voltage Unbalance (5 to 40% - 5%
steps)
Vars, (2%)
Phase Voltage Reversal
Power Factor (4%)
Overvoltage (105 to 140% - 5% steps)
Frequency (0.5%)
Overvoltage (105 to 140% - 5% steps)
Watthours (2%)
Undervoltage (95 to 60% - 5% steps)
Watt Demand (2%) with (5, 10, 15, Time Delay for Overvoltage, Undervoltage,
30 min. interval)
and phase unbalance (0 to 8 sec. - 1 sec.
steps)
The device shall auto range between units, kilo-units, and mega-units. The device
shall have the capability to communicate data via twisted pair network.
C.
Inputs: Input ranges of the device shall accommodate external current
transformers as required. Provide three external current transformers with
rating sized for incoming service. Potential transformers shall be provided
and fused. Control power shall be derived from the metered line.
D.
Outputs: Outputs shall have separate Form C (NO/NC) trip and alarm
contacts with ratings of 10 amperes at 480 volt A.C. Also provide a separate
Form C (NO/NC) contact to provide programmable kilowatt hour pulse
output.
E.
Design Selection: Westinghouse IQ Data Plus II, G.E. or Square-D equals.
F.
Ground Fault Protection: Ground fault protection system shall be provided
consisting of the following;
1. A ground sensor on line side of main switch encircling all phase and
2.
3.
4.
5.
G.
neutral conductors connected to an adjustable solid state ground
relay switch which initiates automatic shunt tripping of the main
and/or branch circuit interrupting devices.
System shall be adjustable from 200 to 1200 primary amperes, and
time current characteristics shall provide 6 cycle operation at about
ten times setting.
Relay output shall operate at 120 volts A.C. fused source from main
bus. Provide all terminal blocks, transformer, auto-reset fuses,
interconnecting wiring, etc.
Submit relay curves and all main/branch breakers for coordination
study.
Provide two levels of ground fault protection in accordance with
NEC 517.
Phase Protection: A phase protection system shall be provided as
follows;
1. System shall provide loss of phase, phase reversal, low voltage and
phase unbalance protection.
DISTRIBUTION SWITCHBOARDS 16425-4
2. System shall consist of solid state controller, DPDT relay, terminal
3.
4.
5.
6.
7.
2.02
blocks, audio and visual failure indicator with local silence switch,
adjustable trip delay (1 to 10 seconds) adjustable sensitivity, autoreset fuses and all interconnecting wiring.
Unit shall be mounted in NEMA 1 enclosure adjacent to or mounted
on side of, or in the main section of the distribution panelboard.
System shall control shunt trip mechanisms on circuit breakers were
equipped with such features.
Unit voltage shall match voltage system of main board. Provide
additional relay operated, by phase protection system, as required if
tripping more than one breaker.
Phase protection system unit shall be Time Mark #259 for system
voltage, or equal.
Submit phase protection system layout with shop drawing.
DISTRIBUTION SECTIONS
A.
General: Circuit breakers below 400 amps shall be bolt-on thermal
magnetic molded case circuit breakers, and shall be totally front
accessible. The branch protective devices are to be mounted to permit
easy installation, maintenance and testing without reaching over any line
side bussing. The circuit breakers shall be removable by the
disconnection of only the load side cable terminations and all line and load
side connections shall be individual to each circuit breaker. No common
mounting brackets or electrical bus connectors shall be acceptable. Each
circuit breaker is to be provided with an externally operable mechanical
means to trip the circuit breaker, enabling maintenance personnel to verify
the ability of the circuit breaker trip mechanism to operate, as well as
exercise the circuit breaker operating mechanisms. Handles shall have
“ON”, “OFF”, and “TRIPPED” positions.
B.
Solid State Circuit Breakers: All breakers 400 amperes and above shall
be solid-state with adjustable settings for long-time, short-time,
instantaneous, long-time delay and short-time delay.
C.
All circuit breakers shall be fully rated. No series rating is allowed.
PART 3 - EXECUTION
3.01
INSPECTION
A.
Preparation: Examine area to receive panelboard to assure that there is
adequate clearance to meet NEC requirements and normal maintenance
issues for panelboard installation. Check that housekeeping pads
(concrete base) are level and free of irregularities. Start work only after
any unsatisfactory conditions have been corrected.
DISTRIBUTION SWITCHBOARDS 16425-5
3.02
INSTALLATION
A.
Compliance: Provide panelboard complete in accordance with
manufacturer's written instructions, NEC, and all applicable codes.
B.
Mounting: Where full height, mount panelboard on 4 inch housekeeping
pad (concrete base). Pad shall extend 6 inches beyond edge on all sides
with all equipment installed.
C.
Mats: Provide continuous rubber insulating mat on floor in front of
panelboard. Mat shall extend for the entire length of panelboard plus two
feet beyond each side. Mat to be minimum 3 feet wide and 1/4 inch thick.
Mat shall lie flat on floor without the use of any adhesive or fastener.
Entire edge of mat shall be chamfered. Submit manufacturers data sheet
of mat with shop drawings.
D.
Storage and Delivery: Panelboards shall be delivered to the site during
that phase of panelboard installation in order to avoid storing panels on
site where damage may occur. Replace any damaged parts prior to
energizing panel. Cover panelboard to avoid damage to finish.
E.
Mounting: Do not mount equipment directly to masonry or concrete walls.
Provide two uni-strut spacers between wall and panelboard.
F.
3.03
Operations and Maintenance Data: Manufacturer’s instructions for
tightening bus connections, cleaning, operation and maintenance.
FIELD QUALITY CONTROL
A.
General: Provide field tests prior to energization as follows;
1. Megger check and record all data, of phase to phase and phase to
ground insulation levels.
2. Continuity.
3. Short Circuit.
4. Proper phase relationship.
B.
3.04
Provisions: Perform tests according to panelboard manufacturer's
instructions.
ADJUSTMENT AND CLEANING
A.
Adjustments: Adjust operating mechanisms for free mechanical
movement.
B.
Connections: Tighten bus connections and mechanical fasteners.
DISTRIBUTION SWITCHBOARDS 16425-6
C.
3.05
Finish: Touch-up scratched or marred surfaces to match original finish.
CHECK-OUT MEMO
A.
General: Submit check-out memo from panelboard representative.
END OF SECTION 16425
DISTRIBUTION SWITCHBOARDS 16425-7
CHECK-OUT MEMO
NOTE TO CONTRACTOR:
Do not submit this form at the time Technical Information
Brochure is submitted. This form shall be completed and
submitted before Instruction in Operation to Owner or a
request for final inspection.
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:
____________________________________________________________________
(Name of Project)
1.
The equipment furnished by us has been checked on the Job by us. We have
reviewed (where applicable) the performance verification information submitted
to us by the Contractor.
2.
The equipment is properly installed, except for items noted below.*
3.
4.
The equipment is operating satisfactorily, except for items noted below.*
The written operating and maintenance information (where applicable) has been
presented to the Contractor, and gone over with him in detail. Five (5) copies of
all applicable operating and maintenance information and parts lists have been
furnished to him for insertion in each of the Equipment Brochures.
Checked by:
_______________________________________________________________
(Printed Name of Manufacturer's Representative)
_____________________________________________________________
(Address and Phone No. of Representative)
____________________________________________________________
(Signature and Title of Person Making Check)
____________________________________________________________
(Date Checked)
cc:
Owner, Architect, Engineer, Contractor and Subcontractor
*Exceptions noted at time of check were as follows: