have trip current ratings and frame sizes as shown. Nominal voltage
ratings, maximum short-circuit interrupting ratings shall be in accordance
with ANSI C37.16. Tripping features shall be as follows:
1. Long-time current pick-up, adjustable from 50 percent to 100
percent of sensor current rating.
2.
Adjustable long-time delay.
3. Short-time current pick-up, adjustable from 1.5 to 9 times
long-time current setting.
4.
Adjustable short-time delay.
5.
[Short-time I square times t switch.]
6. Instantaneous current pick-up, adjustable from 1.5 to 9 times
long-time current setting.
7. Ground-fault pick-up, adjustable from 20 percent to 60 percent
of sensor rating, but in no case greater than 1200 amperes.
Sensing of ground-fault current at the main bonding jumper or
ground strap shall not be permitted. [Zone-selective interlocking
shall be provided as shown.]
8.
[Fixed] [Adjustable] ground-fault delay.
9.
[Ground-fault I square time t switch.]
10. [Overload] [and] [Short-circuit] [and] [Ground-fault] trip
indicators shall be provided.
2.11.2.2
Molded-Case Circuit Breakers
NEMA AB 1 and UL 489.
2.11.3
Wiring
Wiring between separate items of station equipment shall conform to the
requirements of Section [16370A ELECTRICAL DISTRIBUTION SYSTEM, AERIAL] [
16375A ELECTRICAL DISTRIBUTION SYSTEM, UNDERGROUND]. Solid wiring may be
used for convenience outlets, heating elements, and lighting circuits.
Otherwise, the minimum class of stranding shall be Class C. Class K
stranding shall be used for wiring between items of equipment mounted on
swinging panels or doors and items mounted on fixed panels or parts of
fixed assemblies. The insulation type shall be the type SIS unless
otherwise specified, indicated, or proposed and approved for use. The
minimum wire gauge shall be No. 14 AWG, except No. 18 AWG may be used for
circuits that use one ampere or less. Circuits rated less than 115 volts
ac or 125 volts dc may be wired with wiring rated 300 volts-to-ground.
Otherwise, all wiring shall be rated for 600 volts ac and 250 volts dc
Current transformer circuit wiring shall be not less than No. 10 AWG.
Wiring for Close and Trip circuits shall be not less than No. 8 AWG. Wire
markers shall be affixed to each end of wires and shall contain wire number
or designations shown on contract or detail drawings, or as otherwise
approved. Wire numbers shall also be permanently marked on terminal block
marking strips where wires are connected. Only insulated-barrel,
crimp-type, ring lugs shall be used.
SECTION 16311A
Page 62
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