SECTION 16470 ELECTRICAL PANELBOARDS
PART 1 GENERAL
1.1 RELATED REQUIREMENTS
A. Applicable requirements of Division 0 and Division 1 shall govern work in this Section.
1.2 SCOPE
A. Provide panelboards as indicated in the panel schedule, as noted on the drawings and as specified herein.
1.3 SUBMITTALS
A. Shop Drawings
1. Cabinet dimensions, nameplate nomenclature, electrical ratings, and breaker type listing.
2. Product data sheets with installation instructions.
3. Field quality control test results.
4. Operating and maintenance data.
1.4 PRODUCT DELIVERY, STORAGE, AND HANDLING
A. Do not store panelboards exposed to weather.
B. Protect panelboards against damage from work of other trades.
PART 2 PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. Use of a manufacturer's name and model or catalog number is for the purpose of establishing standard of quality and general configuration desired.
B. Square D
C. Siemens
D. Eaton/Cutler-Hammer
2.2 PANELBOARD RATINGS
A. UL listed short circuit rating (integral equipment rating):
1. 208Y/120V and 120/240V Lighting Panels: 10,000 RMS symmetrical amperes minimum equivalent to Square D type NQOD.
2. 480Y/277V Lighting Panels: 14,000 RMS symmetrical amperes minimum equivalent to Square D type NEHB.
3. Power Panels: 22,000 RMS symmetrical amperes minimum or as specified on the drawings. Equivalent to Square D I-Line.
2.3 PANELBOARD CONSTRUCTION
A. Main breaker or main lugs only, per panelboard schedule.
2.4 BUSSING
A. Plated copper phase bussing.
B. Plated copper neutral bus with terminals.
C. Copper equipment grounding bus with terminals.
D. Distributed phase sequence type.
E. Ratings per panelboard schedule, 100 amp minimum.
2.5 PANEL CABINETS
A. Code gauge galvanized steel.
B. Minimum 20" wide.
C. Minimum 5¾" deep.
D. Height as required to accommodate breakers and spaces indicated on plans and code required gutter space
E. Gutters adequate for wire size used, 4 inches minimum.
2.6 PANEL FRONTS
A. Dead front safety type.
B. Concealed adjustable trim clamps.
C. Code gauge steel with rust inhibiting primer and baked enamel finish.
D. Panel front cover shall have piano hinge to allow access to wiring gutters with out removal of panel trim. Hinged trim held in place with screw fasteners. Door shall be built into trim which allows access to breakers as well as to hinged trim screw fasteners. Breaker access door shall have the following features.
1. Concealed piano hinge.
2. Flush stainless steel cylinder tumbler type locks with spring loaded door pulls.
3. Locks for all job panels keyed alike.
4. Steel frame circuit directory holder with directory cards on inside face.
5. Suitable for complete descriptions.
6. Clear plastic cover.
2.7 BRANCH BREAKER DETAILS
A. Conform to Section 16475.
B. UL Class A ground fault circuit protection (GFI) as indicated on drawings.
C. UL listed terminals for type and temperature rating of wire utilized. Anti-turn solderless type.
D. Circuit breaker construction for NQOD and NEHB panels shall bolt on to panel bussing.
E. Circuit breaker construction for I-Line panels shall plug on to panel bussing but breaker cases shall bolt to panel cabinet.
2.8 NAMEPLATES
A. Engraved laminated plastic type.
B. Letters 1/2 inch high.
C. Black letters on white background.
D. Verify final panelboard designation with the owner's representative.
2.9 ARC FLASH WARNING LABELS
A. All panelboards shall include a warning label indicating the risk of arc flash. The warning label shall comply with N.E.C. article 110.16 and O.S.H.A. 29.
PART 3 EXECUTION
3.1 INSPECTION
A. Examine area to receive panelboard to assure adequate clearance for panelboard installation.
B. Start work only after unsatisfactory conditions are corrected.
3.2 INSTALLATION
A. Install in accordance with manufacturer's written instructions, applicable requirements of NEC and NECA's "Standard of Installation," and in accordance with recognized industry practices.
B. Flush mount, surface mount, and install on equipment rack or in MCC as specified on drawings and schedules.
C. Support panel cabinets independently to structure with no weight bearing on conduits.
D. Install recessed panelboards to allow cover to be drawn tight against wall to provide neat appearance.
E. Install panelboards so top breaker is not higher than 6 ft-0 in. above floor.
F. Adjacent panel cabinets shall be of same size and mounted in horizontal alignment.
G. Install in each panelboard a typewritten directory accurately indicating rooms and/or equipment being served.
H. Attach nameplates. Nameplates for panels in public areas shall be attached to the inside face of the cover. Nameplates for panels in equipment rooms and other non-public areas shall be attached to the outside face of the cover.
3.3 FIELD QUALITY CONTROL
A. Balance load among feeder conductors.
B. Unbalance shall not exceed ??7½% of computed average load per phase.
C. Energize each circuit and check for complete and correct function.
3.4 ADJUSTMENT AND CLEANING
A. Adjust doors and operating mechanisms for free mechanical movement.
B. Tighten lugs and bus connections.
C. Clean interior of panelboard.
D. Sand, prime and paint scratched or marred surfaces to match original finish.
END OF SECTION
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