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A K D - 20 A N D E NTE LLYS I S
LO W VO LTAG E S W I TC H G E A R
7.4 Switchgear accessories
Future circuit breaker compartments
Breaker compartments designed for future use
are complete and ready to use. These breaker
compartments have a steel panel to cover the
door cutout, Fig. 7.6. To prepare the circuit breaker
compartment for use, remove the steel outer cover.
Warning: Terminals behind the steel barrier
may be electrically hot.
Avertissement: Les bornes situées
derrière la barre d'acier peuvent être
sous haute tension.
—
Fig. 7.6.
Future circuit breaker
compartment
—
Fig. 7.6.
—
Fig. 7.7.
—
Fig. 7.8.
—
Fig. 7.7.
Key interlocks shown
in cassette
—
Fig. 7.8.
Cassette racking door
padlock device
Circuit breaker key interlock
General
A circuit breaker key interlock is available to provide
protection against unauthorized operation. See
Fig. 7.7. The key interlock is mounted on the right
of escutcheon of the cassette below the breaker.
The typical interlock system is designed so that the
key may be removed from the lock only when the
breaker is tripped. The key actuates a cam that
elevates the trip bar on the cassette and the
breaker is rendered trip free.
Key interlock operation check
The operation of the key interlock should be
checked as follows:
1. With the breaker in the CONNECT position,
manually trip the breaker. This then allows the key
interlock to elevate the trip bar. When the trip bar
is elevated, the breaker cannot be closed but the
key can be removed. The breaker will remain trip
free until the key is returned and the trip bar
is lowered.
2. If desired, the breaker may be moved to either
the TEST or DISCONNECT position while the key
is removed from the lock. In these positions,
the breaker cannot be operated for checking
or maintenance.
Padlocking the cassette racking door
The cassette racking door can be padlocked to
prevent access to the racking door. The cassette
can be padlocked with the breaker in any position
or without the breaker installed. Up to three
padlocks can be placed on a cassette. A padlock
with a hasp thickness of at least 0.120” should be
used to padlock the racking shaft door. To padlock
cassette racking door, pull out the racking door
locking tab and insert padlock, see Fig 7.8.