c. Recovery of voltage from 1 of the 2 normal sources shall (after a
time delay) open the bus tie breaker and close the associated supply
breaker.
d. Recovery of voltage from both normal sources shall (after a time
delay) open the bus tie breaker and close the supply breakers.
e. After pickup by the voltage relays, the bus transfer operation
shall be accomplished within approximately 1 second.
2.5.5
Wiring
2.5.5.1
Control Panel and Power Wiring
Control panel wiring shall be stranded copper switchboard wire with
600-volt insulation. The wire shall be Type SIS as listed in NFPA 70 and
shall meet the requirements of NEMA WC 70. Hinge wire shall have class K
stranding. Current transformer secondary leads shall be not smaller than
No. 10 AWG. The minimum size of wire for all other control wiring shall be
No. 14 AWG. Power wiring for 480-volt circuits and below shall be of the
same type as control panel wiring and the minimum size shall be No. 12 AWG.
2.5.5.2
Terminals and Installation
a. Control wiring within the assembly housings shall be furnished and
installed by the Contractor as specified. All control wiring leaving
equipment shall be run to and terminated on terminal blocks. Terminal
blocks and internal wiring shall be provided for connection of remote
circuits to all spare auxiliary and alarm contacts, remote
annunciators, remote control switches, and pilot devices and remote
indicating lights where such devices are specified and applicable to
the equipment involved. Each individual potential transformer lead
shall be brought out to a terminal block. Potential transformers for
ground detecting circuits shall be grounded at the equipment.
Potential transformers for metering circuits will be remotely grounded
by the Government. There shall be no splices in the wiring and all
connections shall be made at terminal studs or blocks. Terminal blocks
shall be added for wiring to devices having leads instead of terminals.
Indented terminals, Burndy Type YAV10 or an approved equal, shall be
used on all wires terminated on screw or stud terminals. All screw
terminals shall have toothed lock washers and all stud terminals shall
have contact nuts and either locking nuts or lock washers.
b. All external control cables and power cables will enter the
switchgear in [conduit] [cable trays] [from above] [from below]. Space
for cables as shown shall be provided. The 600-volt metal-enclosed
buses shall enter the switchgear from [above] [below through floor
slots]. Matching openings shall be provided in the switchgear to
permit the entrance of the bus into the switchgear through the concrete
openings. Clam-style terminals of sizes indicated shall be provided
for all main power cable leaving the switchgear. The terminals shall
be of the heavy-duty, full clamp type, Burndy "Qiklug", or approved
equal. Adequate provisions shall be included for supporting the
Government's cables between the conductor terminating points and where
they enter or leave the switchgear.
SECTION 16404A
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