18
3 . s w I TC h G e a r D e s C r I p T I o N
3.7 Breaker compartment
Closed-door draw-out circuit breaker
compartments, Fig. 3.8, are standard construction
with all switchgear equipment. The circuit breaker
compartment doors remain closed and latched
while the breaker is racked out from the
CONNECTED position, through TEST, to
the DISCONNECTED position.
Breaker compartment doors do not have any
ventilation slots, thus protecting operators from
hot ionized gases which may be vented by the
breaker during circuit interruption. Additionally,
the breaker compartment, Fig. 3.9, is enclosed by
grounded steel barriers on the top, sides, bottom,
and front. In the back, a flame-retardant, track
resistant, glass-filled polyester base minimizes
the possibility of fault communication between
compartments or to the bus.
1. Access port to racking mechanism
2. Racking handle
3. Breaker position indicator
4. Circuit breaker door frame and gasket
1. Primary disconnect stab tip (typical)
2. Secondary disconnects
3. Position switch location (not shown)
—
Fig. 3.8
—
Fig. 3.8
EntelliGuard circuit
breaker compartment
—
Fig. 3.9B
—
Fig. 3.9B
Circuit breaker
compartment
for EntelliGuard
circuit breakers
—
Fig. 3.9A
Circuit breaker
compartment
for EntelliGuard
circuit breakers
1
2
3
4
2
3
1
1. Cassette side barrier
2. Cassette bottom and racking box
3. Racking arm
4. Draw-out rails
—
Fig. 3.9A
1
3
4
2
