Final 26 24 16 Panelboards.pdf

OFFUTT AIR FORCE BASE

(092036) 26 24 16-1 (Repair AHU O-Club, B462)

2010 by FEI

SECTION 26 24 16

PANELBOARDS

PART 1 - GENERAL

1.1 SUMMARY

A. Extent of panelboard and enclosure work, including cabinets and cutout boxes is indicated by drawings.

B. Types of panelboards and enclosures in this section include the following:

1. Lighting and appliance panelboards.

C. Refer to other Division 26 Sections for cable/wire, connectors, and electrical raceway work required in conjunction with panelboards and enclosures.

PART 2 - PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, provide panelboard products of one (1) of the following:

1. General Electric Company.

2. Siemens.

3. Square D Company.

4. Cutler-Hammer.

2.2 PANELBOARDS

A. General: Except as otherwise indicated, provide panelboards, enclosures and auxiliary components, of types, sizes and ratings indicated, which comply with manufacturer's standard materials; design and construction in accordance with published product information; equip with proper number of unit panelboard devices as required for complete installation. Where types, sizes or ratings are not indicated, comply with NEC, UL and established industry standards for those applications indicated.

B. Lighting and Appliance Panelboards: Provide dead-front safety type lighting and appliance panelboards as indicated, with switching and protective devices in quantities, ratings, types and arrangements indicated; with anti-turn solderless pressure type lug connectors approved for copper or aluminum conductors; equip with copper bus bars, full-sized neutral bar where indicated, with bolt-on type heavy-duty, quick-make, quick-break, single-pole or multi-pole circuit- breakers, as indicated, with toggle handles that indicate when tripped. Multipole breakers shall be provided with a common trip.

Provide suitable lugs on neutral bus for each outgoing feeder required; provide bare uninsulated copper grounding bars suitable for bolting to enclosures.

1. Lighting and Appliance Panelboards shall be equivalent to:

480V

Bolt-on

General Electric AD, AE

Siemens S2

(092036) 26 24 16-2 (Repair AHU O-Club, B462)

Square D NF

Cutler-Hammer PRL2, PRL3

2. Breakers in 480-volt panelboards shall be fully rated and shall have an interrupting capacity of not less than 65,000 amperes symmetrical.

C. Load center construction shall not be acceptable.

D. Lighting and Appliance Panelboard Enclosures: Provide galvanized sheet steel cabinet type enclosures, minimum 20-inches wide and 5-3/4-inches deep, code-gage, minimum 16-gage thickness.

Construct with multiple knockouts and wiring gutters. Provide fronts with adjustable trim clamps, and doors with flush metal locks and keys, all panelboard enclosures keyed alike. Equip with interior circuit-directory frame, and card with clear plastic covering. Provide baked gray enamel finish over a rust inhibitor coating. Design enclosures for recessed or surface-mounting as indicated. Provide enclosures which are fabricated by same manufacturer as panelboards, which mate properly with panelboards to be enclosed and are NEMA rated to suit the atmospheric conditions of the equipment surroundings.

1. Furnish six (6) spare keys for each type of panelboard cabinet lock.

E. Panelboard Accessories: Provide panelboard accessories and devices including, but not necessarily limited to circuit-breakers, trip units, etc., as recommended by manufacturer for ratings and applications indicated.

PART 3 - EXECUTION

3.1 INSPECTION

A. Installer must examine areas and conditions under which panelboards and enclosures are to be installed and notify Contractor in writing of conditions detrimental to proper completion of work. Do not proceed with work until unsatisfactory conditions have been corrected in a manner acceptable to

Installer.

3.2 INSTALLATION OF PANELBOARDS

A. General: Install panelboards and enclosures as indicated, in accordance with manufacturer's written instructions, applicable requirements of NEC Standards and NECA's "Standard of Installation", and in compliance with recognized industry practices to ensure that products fulfill requirements.

B. Coordinate installation of panelboards and enclosures with cable and raceway installation work.

C. Tighten connectors and terminals, including screws and bolts, in accordance with equipment manufacturer's published torque tightening values for equipment connectors. Where manufacturer's torquing requirements are not indicated, tighten connectors and terminals to comply with tightening torques specified in UL Standards 486A and B or manufacturer's torque requirements when more stringent.

D. Anchor enclosures firmly to walls and structural surfaces, ensuring that they are permanently and mechanically secure.

E. Provide properly wired electrical connections within enclosures.

(092036) 26 24 16-3 (Repair AHU O-Club, B462)

F. Provide factory panelboard circuit directory cards upon completion of installation work. Circuit directory cards shall be arranged with even numbered circuits separated by group or card from odd numbered circuits. All circuits, including spares and spaces, shall be labeled. All identification shall be at a minimum typewritten. Hand lettering is not acceptable.

G. All wiring within panelboards shall be arranged in a neat and organized manner.

H. Provide engraved plaque, fasten with mechanical fasteners on each panelboard.

3.3 GROUNDING

A. Provide equipment grounding connections for panelboards as required by NEC and other Division 26

Sections. Tighten connections to comply with tightening torques specified in UL Standards 486A and B to assure permanent and effective grounds.

3.4 FIELD QUALITY CONTROL

A. Prior to energization of circuitry, check all accessible connections to manufacturer's tightening torque specifications.

B. Prior to energization of panelboards, check with ground resistance tester phase-to-phase and phase-to-ground insulation resistance levels to ensure requirements are fulfilled.

C. Prior to energization, check panelboards for electrical continuity of circuits and for short-circuits.

D. Subsequent to wire and cable hook-ups, energize panelboards and demonstrate functioning in accordance with requirements. Where necessary, correct malfunctioning units and then retest to demonstrate compliance.

E. After occupancy, measure panelboard loads. Re-connect circuits and balance loads equally across all phases.

END OF SECTION