Attachment_C_-_Panelboard_Specification_(19_Feb_2015).docx
DOCX document 18 KB Posted
- Attached to
- DECC Furniture Purchase and Installation
- Solicitation number
- HC102815T0062
- Issued by
-
Defense Information Systems Agency
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Attachment 4- Panelboard Specifications (Attachment C)
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UNCLASSIFIED - FOR OFFICIAL USE ONLY
Attachment C 19 February 2015 Panelboard Specification Panelboards shall be constructed to comply with the requirements of UL 67 and UL 50.
All panelboard interiors shall be constructed using hard drawn copper of 98% conductivity, with AIC bracing greater than the calculated available fault current. Bus shall be of sufficient size to accommodate all spaces in panelboard. Minimum short circuit rating for 208/120v panelboards shall be 10,000 amperes symmetrical. Minimum short circuit rating for 480/277v panelboards shall be 14,000 amperes symmetrical. A 200% neutral shall be provided for panelboards serving loads served from the secondary side of K-rated transformers or harmonic canceling transformers. A full-size copper ground bus for connecting ground conductors shall be bonded to the steel cabinet. Provide isolated ground bus where required.
Branch circuit breakers shall be bolt-on designed for replacement without disturbing adjacent units. Breakers shall comply with the requirements of UL 489, thermal magnetic type with short-circuit rating greater than the calculated available fault current. Panels shall be specified with “door-in-door” trim.
Panels shall be specified, purchased and installed with “door-in-door” trim. Interior door shall be hinged with hand-operated latch or latches, as required to provide access only to circuit breaker operating handles, not to energized parts. Outer hinged door shall be securely mounted to the panelboard box with factory bolts, screws, clips, or other fasteners, requiring a tool for entry. Hand-operated latches are not acceptable. Inner and outer doors shall open left to right.
Mechanical lugs furnished with panelboards shall be machined metal alloys of sizes suitable for the conductors to which they will be connected.
Where designated on panel schedule "spaces," include all necessary bussing, device support, and connections. Provide blank cover for each space.
In two-section panelboards, the main bus in each section shall be full-size. The first section shall be furnished with subfeed lugs on the line side of main lugs only, or through-feed lugs for main breaker type panelboards, and have cable connections to the second section. Panelboard sections with tapped bus or crossover bus are not acceptable.
Series-rated panelboards are not permitted.
Provide galvanized steel cabinets to house panelboards. Cabinets for outdoor panelboards shall be factory primed and suitably treated with a corrosion-resisting paint finish meeting UL 50 and UL 67.
Cabinet enclosure shall not have ventilating openings.
UNCLASSIFIED - FOR OFFICIAL USE ONLY
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