SECTION 262500 - ENCLOSED BUS ASSEMBLIES



This master should be used by designers working on Port of Portland construction projects and by designers working for PDX tenants (“Tenants”). Usage notes highlight a few specific editing choices, however the entire section should be evaluated and edited to fit specific project needs.

SECTION 262500 – ENCLOSED BUS ASSEMBLIES

GENERAL

1. DESCRIPTION

A. This section describes bus ducts and related components.

PRODUCTS

1. GENERAL

A. Acceptable manufacturers for the bus duct system are G.E., Square D, Westinghouse, or equal as required to match existing.

2. DISTRIBUTION BUS

A. Distribution bus shall be low impedance, non-ventilated plug-in type, copper, 480Y/277 volt, 3-phase, 5-wire, full rated neutral and 50 percent ground, ampacity rating as shown on the drawings at 30°C ambient temperature, braced for 30,000 AIC minimum. The temperature rise at any point in the bus shall not exceed 55°C above ambient when operating at rated load current.

3. ACCESSORIES

A. Hangers, end caps, cable tap boxes, etc., as required, shall be from the same manufacturer as the bus duct, and shall be included as an integral part of the bus systems.

B. Bus Plugs: Fusible switch, 600V, 3-pole, 5-wire, with handle for on/off operation.

4. SPARE COMPONENTS

Indicate number of spare components desired.

A. Furnish the following components, to be turned over at contract closure.

1. _____ 400 amp busplugs.

2. _____ 200 amp busplugs.

3. _____ 100 amp busplugs.

4. _____ 60 amp busplugs.

EXECUTION

1. INSTALLATION

A. The ampere rating, approximate footage, fittings, etc., are as shown on the drawings. Final field measurements shall be made by the Contractor prior to release of the bus systems for fabrication.

B. Install parallel bus duct on a staggered plug-in pattern.

C. Torque bus duct connections according to the manufacturer’s recommendations.

D. Install bus plugs and coordinate fuse sizing with equipment or load served.

E. Hangers:

1. Support bus with hangers, 10'-0" maximum spacing, anchored to structure as detailed on the drawings.

END OF SECTION 262500

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