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Equipment Description
01.4IB.50026A
2) Key Lock “K2” (Keys KB and KC)
The key lock “K2” interlock is a two cylinder
lock used to mechanically lock the ground
and test device ground-making switch in
the “OPEN” position.
The K2 interlock cannot be operated until
the manual trip operator is fully depressed.
When the manual trip operator is fully
depressed, the ground-making switch
operating mechanism is held in the open
and trip-free condition.
The key lock “K2” interlock is operable only
when key “KB” is inserted and the manual
trip operator is depressed. When the K2
interlock is operated with the locking bolt
extended, the ground-making switch is
open, the KB key is retained and the KC key
is released.
3) Key Lock “K3” (Key KC)
The key lock “K3” interlock is a single
cylinder lock. When the K3 interlock is
locked, the ground and test device is
prevented from being inserted into or
removed from the connected position of
the circuit breaker compartment.
When the ground and test device is
in the disconnected position, the K3
interlock prevents access to the ground
and test-mounted racking device input
shaft, thereby preventing the insertion
of the ground and test device into the
connected position in the circuit breaker
compartment.
When the ground and test device is in
the connected position, the K3 interlock
prevents access to the ground and
test-mounted racking device input shaft.
This action prevents the removal of the
ground and test device from the connected
position.
With the KC key inserted and the locking
bolt retracted to enable racking of the
ground and test device in or out of the
connected position, the KC key is retained.
4) Key Lock “K4” (Keys KB and KD)
The K4 interlock consists of a two cylinder
lock used to mechanically lock the ground
and test device ground-making switch in
the “CLOSED” position.
In the PowlVac ground and test design, the
locking bolt of the K4 interlock cannot be
extended unless the ground-making switch
is in the closed position, the manual trip
operator is in the fully outward position and
the manual trip operator is blocked from
operation.
The K4 interlock is operable only when
the KB key is inserted, the ground
making switch is closed, the manual
trip operator is in the fully outward
position and the manual trip blocking
lever is fully depressed. When the K4
interlock is operated with the locking bolt
extended, the manual tripping function
is mechanically disabled, the KB key is
retained and the KD key is released.
