EDE SIR Attachment J.3 Interior Distribution System Specification.pdf

693KA8-18-R-00005

PART III - SECTION J

ATTACHMENT J.3 - INTERIOR DISTRIBUTION SYSTEM SPECIFICATION

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 2 (2005) Industrial Control and System Controllers, Contactors and Overload Relays - Rated 600 Volts NEMA ICS 3 (2005-01-01) Industrial Control and System Factory-Built Assemblies NEMA KS 1 (2006) Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts Maximum) NEMA TP 1 (2002) Guide for Determining Energy Efficiency for Distribution Transformers

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2014) National Electrical Code

UNDERWRITERS LABORATORIES (UL)

UL 50 12th Edition (September 4, 2007) Enclosures for Electrical Equipment UL 67 12th Edition (April 24, 2015) Panelboards UL 489 12th Edition (January 15, 2013) Safety Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures UL 508 17th Edition (January 28, 1999) Safety Industrial Control Equipment UL 845 (August 31, 2005) Safety Industrial Control Equipment (Motor Control Centers) UL 869A (November 10, 2006) Service Equipment UL 943 (February 2006) Ground Fault Circuit Interrupters UL 1561(March 2011) Dry-Type General Purpose and Power Transformers UL 1699 (April 2006) Arc-Fault Circuit-Interrupters

1.2 RELATED REQUIREMENTS

Specification for Electrical Power Monitoring System - EPMS (Section J.4).

PART 2 PRODUCTS

2.1 MATERIALS AND EQUIPMENT

Materials, equipment, and devices shall, as a minimum, meet requirements of the Underwriters Laboratories codes (UL), where UL standards are established for those items, and requirements of the National Fire Protection Association’s National Electrical Code (NFPA 70).

2.1.1 Identification:

Electrical identification devices placed on equipment shall match electrical distribution switchboards and as specified below:

a. Identify units, devices, controls, and wiring.

b. Mimic Bus: Continuous mimic bus, applied to front of switchboard, arranged in one-line diagram format, using symbols and lettered designations consistent with approved mimic-bus diagram.

1. Mimic-bus segments coordinated with devices in switchboard sections to which applied, to produce a concise visual presentation of principal switchboard components and connections.

2. Medium: Painted graphics.

3. Color: Contrasting with factory-finish background.

c. Nameplates:

Equipment must be labeled in accordance with the instructions in Section C – the Statement of Work, Section C.6.3 – Equipment Identification and Marking. Provide samples for review.

2.1.2 Drawing References

These specifications provide directions that equipment and wiring shall be manufactured and installed “as indicated,” “where indicated,” and “as indicated on drawings.” These references must be understood to refer to the Contractor’s FAA-approved design drawings unless otherwise indicate in the text of the Specification.

2.2 PANELBOARDS

Panelboards shall have UL67 and UL50 short-circuit rating. Panelboards employed in disconnecting electrical service shall additionally conform to UL 869A. Panelboards shall be circuit breaker- equipped.

Design shall be such that individual breakers can be removed without disturbing adjacent units or without loosening or removing insulation. This refers specifically to supplemental insulation installed as a means of obtaining the clearances as required by UL. "Specific breaker placement" is required in panelboards to match the breaker placement indicated in the panelboard schedule on the drawings.

Use of "Subfeed Breakers" is not acceptable unless specifically indicated otherwise. Main breaker shall be "separately" mounted "above" or "below" branch breakers. Where "space only" is indicated, make provisions for future installation of breakers. Panelboard locks shall be keyed same. Directories shall indicate load served by each circuit in panelboard. Directories shall also indicate source of service to panelboard (e.g., Panel PA served from Panel MDP). Type directories and mount in holder behind transparent protective covering. Panelboards shall be listed and labeled for their intended use.

2.2.1 Panelboard Buses

Support bus bars on bases independent of circuit breakers. Main buses and back pans shall be designed so that breakers may be changed without machining, drilling, or tapping. Provide isolated neutral bus in each panel for connection of circuit neutral conductors. Provide separate ground bus identified as equipment grounding bus per UL 67 for connecting grounding conductors; bond to steel cabinet.

2.2.1.1 Panelboard Neutrals for Non-Linear Loads

UL listed, and panelboard type shall have been specifically UL heat rise tested for use on non-linear loads. Panelboard shall be heat rise tested in accordance with UL 67, except with the neutral assembly installed and carrying 200 percent of the phase bus current during testing. Verification of the testing procedure shall be provided upon request. Two neutral assemblies paralleled together with cable is not acceptable. Nameplates for panelboards rated for use on non-linear loads shall be marked "SUITABLE FOR NON-LINEAR LOADS." Provide a neutral label with instructions for wiring the neutral of panelboards rated for use on non-linear loads.

2.2.2 Circuit Breakers

UL 489, thermal magnetic-type having a minimum short-circuit current rating equal to the short-circuit current rating of the panelboard in which the circuit breaker shall be mounted. Breaker terminals shall be UL listed as suitable for type of conductor provided. Series rated circuit breakers and plug-in circuit breakers are unacceptable.

2.2.2.1 Multi-pole Breakers

Provide common trip-type with single operating handle. Breaker design shall be such that overload in one pole automatically causes all poles to open. Maintain phase sequence throughout each panel so that any three adjacent breaker poles are connected to Phases A, B, and C, respectively.

2.2.2.2 Circuit Breaker With GFCI

UL 943 and NFPA 70. Provide with "push-to-test" button, visible indication of tripped condition, and ability to detect and trip on current imbalance of 6 milliamperes or greater per requirements of UL 943 for Class A GFCI devices, for personnel protection, and 20 milliamperes or greater per requirements of UL 943 for Class B GFCI per equipment protection.

2.2.2.3 Circuit Breakers for HVAC Equipment

Circuit breakers for HVAC equipment having motors (group or individual) shall be marked for use with HACR type and UL listed as HACR type.

2.2.2.4 Arc-Fault Circuit-Interrupters

UL 489, UL 1699 and NFPA 70. Molded case circuit breaker shall be rated as indicated. Two pole arc-fault circuit-interrupters shall be rated 120/240 volts. The provision of (two) one-pole circuit breakers for shared neutral circuits in lieu of (one) two-pole circuit breaker is unacceptable. Provide with "push-to-test" button.

2.2.3 Fusible Switches for Panelboards

NEMA KS 1, hinged door-type. Switches serving as motor disconnect means shall be kilowatt horsepower rated.

2.2.4 400 Hz Panelboard and Breakers Panelboards and breakers for use on 400 Hz systems shall be "400 Hz" rated and labeled.

2.3 TRANSFORMERS

NEMA ST 20, general purpose, dry-type, self-cooled, ventilated. Provide transformers in NEMA 1 enclosure. Transformer shall have 220 degrees C insulation system for transformers 15 kVA and greater, and shall have 180 degrees C insulation for transformers rated 10 kVA and less, with temperature rise not exceeding 150 degrees C under full-rated load in maximum ambient of 40 degrees C. Transformer of 150 degrees C temperature rise shall be capable of carrying continuously 100 percent of nameplate kVA without exceeding insulation rating. Transformers shall be quiet type with maximum sound level at least 3 decibels less than NEMA standard level for transformer ratings indicated.

2.3.1 Specified Transformer Efficiency

Transformers, indicated and specified with: 480V primary, 80 degrees C or 115 degrees C temperature rise, kVA ratings of 37.5 to 100 for single phase or 30 to 500 for three phase, shall be energy efficient type. Minimum efficiency, based on factory test results, shall not be less than NEMA Class 1 efficiency as defined by NEMA TP 1. Transformers must meet the requirements of the most current version of federal law 10 CFR Part 431 "Energy Efficiency Program for Certain Commercial and Industrial Equipment".

2.3.2 Transformers with Non-Linear Loads

Transformer insulation shall be a UL recognized 220 degrees C system. Neither the primary nor the secondary temperature shall exceed 220 degrees C at any point in the coils while carrying their full rating of non-sinusoidal load. Transformers are to be UL listed and labeled for K-13 as indicated, defined as the sum of fundamental and harmonic lh (pu) 2h2 per UL 1561. Transformers evaluated by the UL K-Factor evaluation shall be listed for 115 degrees C average temperature rise only.

Transformers with K-Factor ratings with temperature rise of 150 degrees C rise shall not be acceptable.

K-Factor rated transformers shall have an impedance range of 3 percent to 5 percent, and shall have a minimum reactance of 2 percent to prevent excessive neutral current when supplying loads with large amounts of third harmonic.

2.4 MOTOR CONTROL CENTERS

UL 845, NEMA ICS 18. Wiring shall be Class I, Type B, in NEMA Type 1 enclosure. Provide control centers suitable for operation on 480-volt, 3-phase, 3-wire, 60 Hz system and shall have minimum short-circuit withstand and interrupting rating of 65,000 amperes rms symmetrical. Incoming power feeder shall be cable entering at the top or bottom of enclosure and terminating on terminal lugs.

Main protective device shall be molded case circuit breaker rated at amperes rms symmetrical interrupting capacity. Arrange busing so that control center can be expanded from both ends.

Interconnecting wires shall be copper. Terminal blocks shall be plug-in-type so that controllers may be removed without disconnecting individual control wiring.

2.4.1 Bus Systems

Provide the following bus systems. Power bus shall be braced to withstand fault current of 65,000 amperes rms symmetrical. Wiring troughs shall be isolated from horizontal and vertical bus bars.

2.4.1.1 Horizontal and Main Buses

Horizontal bus shall have continuous current rating of 800 and 600 amperes. Main bus shall be copper, silver-plated enclosed in isolated compartment at top of each vertical section. Main bus shall be isolated from wire troughs, starters, and other areas.

2.4.1.2 Vertical Bus

Vertical bus shall have continuous current rating of 600 amperes, and shall be copper, tin-plated.

Vertical bus shall be enclosed in flame-retardant, polyester glass "sandwich."

2.4.1.3 Ground Bus

Copper ground bus shall be provided full width of motor control center and shall be equipped with necessary lugs.

2.4.2 Motor Disconnecting Devices and Controllers

Shall comply with paragraph entitled "Combination Motor Controllers."

2.4.3 Combination Motor Controllers

UL 508 and other requirements in paragraph entitled, "Motor Controllers." Controller shall employ molded case circuit breaker. Circuit breakers for combination controllers shall be thermal magnetic.

2.5 SOURCE QUALITY CONTROL

2.5.1 Transformer Factory Tests

Submittal shall include routine NEMA ST 20 transformer test results on each transformer and also contain the results of NEMA "design" and "prototype" tests that were made on transformers electrically and mechanically equal to those specified.