requirements of ASTM B 187/B 187M, ASTM B 188,
ASTM B 236M ASTM B 236, and
ASTM B 317/B 317M.
2.2
CONDUIT AND ELECTRICAL METALLIC TUBING
Rigid conduit shall conform to ANSI C80.1 and shall, be zinc-coated
(galvanized) both inside and outside by the hot-dip method. Electrical
metallic tubing shall conform to ANSI C80.3. Fittings for rigid metal
conduit and electrical metallic tubing shall conform to NEMA FB 1.
2.3
CONNECTIONS
All bolts, studs, machine screws, nuts, and tapped holes shall be in
accordance with ASME B1.1. Threads for sizes 6 to 25 mm 1/4 to 1 inch,
inclusive, shall be NC or UNC series. The sizes and threads of all valves,
pipe and fittings, conduit and fittings, tubing and fittings, and
connecting equipment shall be in accordance with ASME B1.20.1.
Manufacturer's standard thread and construction may be used on small items
which, in the opinion of the Contracting Officer, are integrally
replaceable, except that threads for external connections to these items
shall meet the above requirements.
2.4
PAINTING
Metal surfaces of the low-voltage metal-enclosed switchgear assembly and
the enclosures for the metal-enclosed bus and station service transformers
shall be finished and painted in accordance with [IEEE C37.20.1][IEEE
C37.20.2][IEEE C37.20.3], except that all outside surfaces shall be given
not less than 2 coats of quick air drying lacquer or synthetic enamel,
[ANSI] Indoor Light Gray No. 61 in color, with semi-gloss finish.
Accessories and interior surfaces shall be finished in accordance with
manufacturer's standard practices.
2.5
480-VOLT STATION SERVICE SWITCHGEAR
2.5.1
General
Except as otherwise specified or indicated , the design, construction and
tests of the switchgear shall conform to the applicable requirements of
NEMA SG 6, IEEE C37.13, and [IEEE C37.20.1][IEEE C37.20.2][IEEE C37.20.3].
The switchgear will be used to distribute power from two [[_____]-kVA,
[_____]-480 volt] [13,800-480 volt], 3-phase, 60-Hz, station service
transformers to 480-volt power distribution centers and to other station
service loads. The switchgear assembly shall contain two main bus sections
connected by a bus tie circuit breaker. Each main bus section will be
connected to a supply transformer through a main supply circuit breaker.
The two main supply circuit breakers and the bus tie circuit breaker shall
be electrically operated and will normally be remotely controlled.
Automatic bus transfer shall be provided as specified in paragraph
Automatic Bus Transfer. The switchgear shall have instruments, control
accessories, and other equipment mounted on the front panels and inside the
switchgear as shown and as specified. The annunciator window group will be
furnished by the Government for mounting and wiring by the Contractor.
2.5.2
Enclosure and Framework
2.5.2.1
Switchgear
The switchgear shall be of the totally-enclosed, free-standing, dead-front
SECTION 16404A
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