GEK-7 21
01, Low
V
olta
ge
Swifchgeor
R HOUSE
SIDE SHEET
LOCK MOUNTING
HOLES
ERLOCK SLIDE
r09c2075-31
RIVETS
1o9c2075-26
FlG.
24
(75C15002D
Key
Interlock
for
Fuse
Rollout
comportment
There is a key
interlock system required in
the equip-
ment to
keep the
fuse rollout in the CONNECTED or DIS-
CONNECTED
position
unless the
breaker associated with
it is locked
open. A key interlock
is installed in the breaker
compartment in the normal
position. (See
Page
26) A
companion key interlock is
installed in the fuse rollout
compartment. Figure
24 shows the
position
of
the
interlock-
ing devices
in
this compartment
when the key lock bolt is
extended.
Note that the interlock slide
is held forward so
that the racking wrench
cannot be
placed
over
the
jackscrew
shaft, This
prevents
the fuse rollout from being racked out
of its compartment. Note also
the interlock bracket
shown
in Figure 24. This holds the
track
lock link in
the closed
position
when the lock bolt is
extended and
prevents
the
fuse rollout
from being
pulled
out of
the
CONNECTED
position
by
rotating
the track lock links.
In
Figure
24
the
part
numbers refer to sheet and
part
numbers in the
0673D0500
series of drawings
except
when
a
fqll drawing number is shown.
When the equipment is
operating
normally
with the
breaker
closed, the intedock
key is retained in the lock in
the
breaker compartment. In order
to withdraw the fuse
rollout,
the associated breaker must
be
tripped, the
inter-
lock slide
pushed
in,
the
lock
bolt
extended,
and the
key
removed.
The key
is then
placed
in
the lock in the fuse
rollout
compartment and
the lock
bolt is retracted. Now
the
fuse rollout can be racked
out
to the
DISCONNECTED
position.
The operation
of the key
interlock system should be
checked
by following
the
procedure
outlined in the
pre-
ceding
paragraph.
DOOR INTERTOCKS
These interlocks
prevent
opening of the
compartment
door
when the breaker
is
closed.
DOOR
INTERLOCK FOR AK BREAKERS
(OPTIONAL)
Part numbers
in Figure 25 refer to
sheet and
part
num-
bers in the
0673D0500
series of drawings.
This door interlock
consists of a link
(074-03)
mounted
on the inner
house side sheet of
the
breaker
compartment.
A combination torsion, compression spring is mounted on
the
link
pivot pin
and biases the link in a forward
direc-
tion.
One end of the link engages a clip on the
door latch
(640-02),
and
the other end engages
with
the
rackout
mech-
anism interlock slide
627-46. When the breaker
is closed,
a link operated
by
the breaker cross
bar engages
in a
slot
in
the interlock slide. This
prevents
the slide from
moving
back. and then
the door handle cannot
be
lifted.
When
the
breaker is
open, the interlock slide is released
from
the
link
actuated by the breaker.
It
can
now
be
moved
back by
pushing
it
in. The
preferred
way
to
do this is
to
use
the rackout
handle. The door can then be unlatched
by
raising
the handle while the interlock slide is held
in
the
retracted
position.
If required, the
door interlock can be
defeated.
A small
hole is
provided
in the door in front of
the
interlock
link.
By inserting
a tool such
as
a screwdriver
through this
hole,
the link
can be
pushed
back until it is free of the door
latch.
With the link
held in
this manner,
the door latch can
be raised
and the door ooened.
DOOR
TNTERLOCK FOR AKR
BREAKERS
(OPT|ONAL)
Part
numbers in Figure
26 refer to sheet
and
part
num-
bers in the
0673D0500 series of drawings.
This door
interlock does not
operate in conjunction
with
the
compartment
door latch.
It consists
of a hook
(844-04),
link
(8a4-03),
spring
(844-35),
and
bracket
(844-05)
all
mounted
on the rear
of the compartment
door. See Figure 26.
When
the
door is open, the
spring
pulls
down on
the hook,
and the assembly
is held against
the back of the
door.
When the door is closed-with
an open
breaker in the
com-
partment,
the bracket on the
breaker
pushes
against
the
bottom of
the link
(844-03)
and
rotates
the top of the
link
away from the
door. When the door is
closed and latched,
the link
and hook assume
the
positions
shown
in the
"Door
Closed"
portion
of Figure
26. When the
breaker is closed,
the
keeper swings
up
and under
the
hook, and the
door
cannot
be opened.
TRACK
LOCX
LINK
28
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