SECTION 16470

PANELBOARDS

PART 1 GENERAL

SECTION INCLUDES

Distribution panelboards.

Branch circuit panelboards.

Load centers.

RELATED WORK

Section 16190 - Supporting Devices.

Section 16195 - Electrical Identification: Engraved nameplates.

REFERENCES

NECA (National Electrical Contractors Association) "Standard of Installation."

NEMA AB 1 - Molded Case Circuit Breakers.

NEMA ICS 2 - Industrical Control Devices, Controllers, and Assemblies.

NEMA KS 1 - Enclosed Switches.

NEMA PB 1 - Panelboards.

NEMA PB 1.1 - Instructions for Safe Installation, Operation and Maintenance of Panelboards Rated 600 Volts or Less.

NFPA 70 - National Electrical Code.

SUBMITTALS

Submit under provisions of Section [01300.] [_______.]

Shop Drawings: Indicate outline and support point dimensions, voltage, main bus ampacity, integrated short circuit ampere rating, circuit breaker and fusible switch arrangement and sizes.

Manufacturer's Installation Instructions: Indicate application conditions and limitations of use stipulated by Product testing agency. Include instructions for storage, handling, protection, examination, preparation, installation, and starting of Product.

PROJECT RECORD DOCUMENTS

Submit under provisions of Section [01700.] [_______.]

Record actual locations of Products; indicate actual branch circuit arrangement.

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [_______.]

Maintenance Data: Include spare parts data listing; source and current prices of replacement parts and supplies; and recommended maintenance procedures and intervals.

QUALITY ASSURANCE

Perform Work in accordance with NECA Standard of Installation.

Maintain [one copy] [[____] copies] of [each] document on site.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum [three] [_________] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to requirements of NFPA 70.

Furnish products listed and classified by [UL] [testing firm acceptable to authority having jurisdiction] as suitable for purpose specified and indicated.

FIELD MEASUREMENTS

Verify that field measurements are as [indicated [on shop drawings].] [instructed by manufacturer.]

MAINTENANCE MATERIALS

Provide maintenance materials under provisions of Section [01700.] [_______.]

Provide [two] [________] of each panelboard key.

Provide [two] [________] fuse pullers.

EXTRA MATERIALS

Furnish under provisions of Section [01700.] [_______.]

Provide [three] [______] of each size and type of fuse.

PART 2 PRODUCTS

MANUFACTURERS

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

[_____________________________________] Model [_________].

Substitutions: Under provisions of Section [01600.] [________.]

DISTRIBUTION PANELBOARDS

Panelboards:	NEMA PB 1, [circuit breaker type.] [fusible switch type.] [Provide combination controllers as indicated.]

Service Conditions:

Temperature: [___] degrees F ([___] degrees C).

Altitude: [___] feet ([___] M).

Panelboard Bus: [Copper,] [Aluminum,] ratings as indicated. Provide copper ground bus in each panelboard.

Minimum integrated short circuit rating: [_______] amperes rms symmetrical for 240 volt panelboards; [_______] amperes rms symmetrical for 480 volt panelboards[, or as indicated].

Fusible Switch Assemblies: NEMA KS 1, quick-make, quick-break, load interrupter enclosed knife switch with externally operable handle. Provide interlock to prevent opening front cover with switch in ON position. Handle lockable in OFF position. Fuse clips: Designed to accommodate Class [R] [J] fuses.

Molded Case Circuit Breakers: NEMA AB 1. Provide circuit breakers with integral thermal and instantaneous magnetic trip in each pole. Provide circuit breakers UL listed as Type HACR for air conditioning equipment branch circuits.

Molded Case Circuit Breakers with Current Limiters: NEMA AB 1. Provide circuit breakers with replaceable current limiting elements, in addition to integral thermal and instantaneous magnetic trip in each pole.

Current Limiting Molded Case Circuit Breakers: NEMA AB 1. Provide circuit breakers with integral thermal and instantaneous magnetic trip in each pole, coordinated with automatically reseting current limiting elements in each pole. Interrupting rating 100,000 symmetrical amperes, let-through current and energy level less than permitted for same size Class RK-5 fuse.

Controllers:	NEMA ICS 2, AC general-purpose Class A magnetic controller for induction motors rated in horsepower, with [bimetal] [melting alloy] overload relay. Coil operating voltage: [120] [480] [___] volts, [60 Hertz.] [[____] Hertz.] [DC.] Size as shown on Drawings. Provide [unit mounted control power transformer] [and] [HAND-OFF-AUTO selector switch] [ON-OFF selector switch] [STOP-START pushbutton station] [and] [[RED] [GREEN] indicating light] in front cover.

Provide circuit breaker accessory trip units and auxiliary switches as indicated.

Enclosure: NEMA PB 1, [Type 1.] [Type 3R.] [______.] Cabinet box: [_____]inches ([_____] mm) deep; width: [_____] inches ([_____] mm).

Cabinet Front: Surface type, fastened with [concealed trim clamps.] [screw cover.] [hinge and latch.] [Provide hinged door with flush lock.] Finish in manufacturer's standard gray enamel.

BRANCH CIRCUIT PANELBOARDS

Lighting and Appliance Branch Circuit Panelboards: NEMA PB1, circuit breaker type.

Panelboard Bus: [Copper,] [Aluminum,] ratings as indicated. Provide copper ground bus in each panelboard[; provide insulated ground bus where scheduled].

Minimum integrated short circuit rating: [10,000] [_______] amperes rms symmetrical for 240 volt panelboards; [14,000] [_______] amperes rms symmetrical for 480 volt panelboards[, or as indicated].

Molded Case Circuit Breakers: NEMA AB 1, bolt-on type thermal magnetic trip circuit breakers, with common trip handle for all poles. Provide circuit breakers UL listed as Type SWD for lighting circuits. Provide UL Class A ground fault interrupter circuit breakers where scheduled. Do not use tandem circuit breakers.

Current Limiting Molded Case Circuit Breakers: NEMA AB 1. Provide circuit breakers with integral thermal and instantaneous magnetic trip in each pole, coordinated with automatically reseting current limiting elements in each pole. Interrupting rating 100,000 symmetrical amperes, let-through current and energy level less than permitted for same size Class RK-5 fuse.

Enclosure:	NEMA PB 1, [Type 1.] [Type 3R.] [______.]

Cabinet box: 6 inches (153 mm) deep; width: [20] [_____] inches ([508] [_____] mm) [for 240 volt and less panelboards, [20] [_____] inches ([508] [_____] mm) for 480 volt panelboards].

Cabinet Front: [Flush] [Surface] cabinet front with concealed trim clamps, concealed hinge, and flush lock all keyed alike. Finish in [manufacturer's standard gray] [______________] enamel.

LOAD CENTERS

Load Centers: Circuit breaker load center, with bus ratings as indicated.

Minimum integrated short circuit rating: 10,000 amperes rms symmetrical.

Molded Case Circuit Breakers: NEMA AB 1, plug-on type thermal magnetic trip circuit breakers, with common trip handle for all poles. Provide circuit breakers UL listed as Type SWD for lighting circuits. Provide UL Class A ground fault interrupter circuit breakers where indicated. Do not use tandem circuit breakers.

Enclosure:	[General Purpose.] [Rainproof.]

Box:	[Flush] [Surface] type [with door, and [pull ring and latch] [lock] on door.] [without door.] Finish in manufacturer's standard gray enamel.

FUSES

Manufacturers:

[________________________________] Model [_________].

[________________________________] Model [_________].

[________________________________] Model [_________].

Substitutions: Under provisions of Section [01600] [_____].

Fuses 600 Amperes and Less: [Dual element,] current limiting, [time delay,] one-time fuse, [250] [600] volt, UL Class [RK 1.] [RK 5.] [J.] [as indicated].

Fuses 601 Amperes and Larger: Current limiting, [time delay] [fast-acting] one time fuse, 600 volt, UL Class L.

Interrupting Rating: 200,000 rms amperes.

PART 3 EXECUTION

INSTALLATION

Install panelboards in accordance with NEMA PB 1.1.

Install panelboards plumb. [Install recessed panelboards flush with wall finishes.] Provide supports in accordance with Section 16190.

Height: 6 ft (2 M) to top of panelboard; install panelboards taller than 6 ft (2 M) with bottom no more than 4 inches (10 cm) above floor.

Provide filler plates for unused spaces in panelboards.

Provide typed [or neatly handwritten] circuit directory for each branch circuit panelboard. Revise directory to reflect circuiting changes required to balance phase loads.

Provide engraved plastic nameplates under the provisions of Section 16195.

Provide spare conduits out of each recessed panelboard to an accessible location [above ceiling.] [below floor.] Minimum spare conduits: [5] [__] empty [1] [__] inch ([25] [___] mm). Identify each as SPARE.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [________.]

Measure steady state load currents at each panelboard feeder; rearrange circuits in the panelboard to balance the phase loads to within 20 percent of each other. Maintain proper phasing for multi-wire branch circuits.

Visual and Mechanical Inspection: Inspect for physical damage, proper alignment, anchorage, and grounding. Check proper installation and tightness of connections for circuit breakers, fusible switches, and fuses.

SCHEDULES

END OF SECTION