[manually] [electrically] operated, with drawout mounting. Solid-state
trip elements which require no external power connections shall be
provided. Circuit breakers shall have an open/close contact position
indicator, charged/discharged stored energy indicator, primary disconnect
devices, and a mechanical interlock to prevent making or breaking contact
of the primary disconnects when the circuit breaker is closed. Control
voltage shall be [24 V dc] [48 V dc] [120 V ac] [as indicated.] The
circuit breaker enclosure shall be suitable for its intended location.
2.9.2
Ratings
Voltage ratings shall be not less than the applicable circuit voltage.
Circuit breakers shall be rated for 100 percent continuous duty and shall
have trip current ratings and frame sizes as shown. Nominal voltage
ratings, maximum continuous-current ratings, and maximum short-circuit
interrupting ratings shall be in accordance with ANSI C37.16. Tripping
features shall be as follows:
a.
Long-time current pick-up, adjustable from 50 percent to 100
percent of sensor current rating.
b.
Adjustable long-time delay.
c.
Short-time current pick-up, adjustable from 1.5 to 9 times
long-time current setting.
d.
Adjustable short-time delay.
e.
[Short-time I square times t switch.]
f.
Instantaneous current pick-up, adjustable from 1.5 to 9 times
long-time current setting.
g.
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.]
h.
[Fixed] [Adjustable] ground-fault delay.
i.
[Ground-fault I square times t switch.]
j.
[Overload] [and] [Short-circuit] [and] [Ground-fault] trip
indicators shall be provided.
2.10
MEDIUM-VOLTAGE CIRCUIT BREAKERS/INTERRUPTERS
2.10.1
Metal-Enclosed Type
C37.20.1 and NEMA SG 6.
2.10.2
Metal-Clad Type
listed for such units in NEMA SG 6.
SECTION 16475A
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