EDE III Section J-Draft Attachment J.03 Distribution System Specifications.docx

PART III SECTION J

ATTACHMENT J.3 - DISTRIBUTION SYSTEM SPECIFICATION

TABLE OF CONTENTS

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 Industrial Control and System Controllers, Contactors and Overload Relays - Rated 600 Volts NEMA IA 10029 Industrial Control and System Factory-Built Assemblies NEMA BS 31047 Enclosed and Miscellaneous Distribution Equipment Switches (600 Volts Maximum) NEMA US 80035 Guide for Determining Energy Efficiency for Distribution Transformers

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 National Electrical Code

UNDERWRITERS LABORATORIES (UL)

UL 50 Enclosures for Electrical Equipment UL 67 Panelboards UL 489 Safety Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures UL 508 Safety Industrial Control Equipment UL 845 Safety Industrial Control Equipment (Motor Control Centers) UL 869A Service Equipment UL 943 Ground Fault Circuit Interrupters UL 1561 Dry-Type General Purpose and Power Transformers UL 1699 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 must, 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 must 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 and/or affixed graphics.

3. Color: Contrasting with factory-finish background.

Nameplates: Equipment must be labeled in accordance with the instructions in Equipment Identification and Marking. Provide samples for review.

2.1.2 Drawing References

These specifications provide directions that equipment and wiring must 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 must have UL67 and UL50 short-circuit rating. Panelboards employed in disconnecting electrical service must additionally conform to UL 869A. Panelboards must be circuit breaker- equipped. Design must 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. Where "space only" is indicated, make provisions for future installation of breakers. Panelboard locks must be keyed same. Directories must indicate load served by each circuit in panelboard. Directories must 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 must 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 must 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 must have been specifically UL heat rise tested for use on non-linear loads. Panelboard must 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 must be provided upon request. Two neutral assemblies paralleled together with cable is not acceptable. Nameplates for panelboards rated for use on non-linear loads must 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 must be mounted. Breaker terminals must be UL listed as suitable for type of conductor provided. Series rated circuit breakers and plug-in circuit breakers are unacceptable.

Multi-pole Breakers provide common trip-type with single operating handle. Breaker design must 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.

2.2.2.1 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.

2.2.2.2 Circuit Breakers for HVAC Equipment

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

2.2.2.3 Arc-Fault Circuit-Interrupters

UL 489, UL 1699 and NFPA 70. Molded case circuit breaker must be rated as indicated. Two pole arc- fault circuit-interrupters must 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 BS 31047, hinged door-type. Switches serving as motor disconnect means must be kilowatt horsepower rated.

2.2.4 400 Hz Panelboard and Breakers Panelboards and breakers for use on 400 Hz systems must 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 must have 220 degrees C insulation system for transformers 15 kVA and greater and must 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 must be capable of carrying continuously 100 percent of nameplate kVA without exceeding insulation rating. Transformers must 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, must be energy efficient type. Minimum efficiency, based on factory test results, must not be less than NEMA Class 1 efficiency as defined by NEMA US 80035. 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 must be a UL recognized 220 degrees C system. Neither the primary nor the secondary temperature must 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 must be listed for 115 degrees C average temperature rise only. Transformers with K-Factor ratings with temperature rise of 150 degrees C rise must not be acceptable. K-Factor rated transformers must have an impedance range of 3 percent to 5 percent, and must 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 must 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 must have minimum short-circuit to withstand and interrupting rating of amperes rms symmetrical as determined by a project specific short circuit analysis. Incoming power feeder must be cable entering at the top or bottom of enclosure and terminating on terminal lugs. Main protective device must 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 must be copper. Terminal blocks must 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 must be braced to withstand fault current of amperes rms symmetrical as determined by a project specific short circuit analysis. Wiring troughs must be isolated from horizontal and vertical bus bars.

2.4.1.1 Horizontal and Main Buses

Main bus must be copper, silver-plated enclosed in isolated compartment at top of each vertical section. Main bus must be isolated from wire troughs, starters, and other areas.

2.4.1.2 Vertical Bus

Vertical bus must be copper, tin-plated. Vertical bus must be enclosed in flame-retardant, polyester glass "sandwich."

2.4.1.3 Ground Bus

Copper ground bus must be provided full width of the line up and must be equipped with necessary lugs.

2.4.2 Motor Disconnecting Devices and Controllers

Must comply with paragraph entitled "Combination Motor Controllers."

2.4.3 Combination Motor Controllers

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

2.5 SOURCE QUALITY CONTROL

2.5.1 Transformer Factory Tests

Submittal must 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.