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)_
3-
4-
5-
6-
7-
8
7
6
2
3
4
Position-Indicator
Racking
Shaft
Rail
Bearing
Racking
Nut
Forward
Slot
Cam
Rear
Slot
8-
Fig.7
Negative
Interlock
I
-
Notched
2
-
Detent
3
-
Keylock
4
-
Bolt
5
-
Slot
Sliding Link
Fig.8
Key
The negative
interlock
consists of
two
notched members
in
the left-side-track
assembly
which
operate the negative
(trip
latch)
interlock roller
on
the
left
side
of the breaker. Refer
to
Fig.
7.
On
the breaker
cubicle
one member is
stationary
and
the other is a
spring-loaded slide attached
to the
racking
mechanism.
A third
rnember,
a
notched sliding
link, provides
the key
lock functions and
is described
under
KEy LOCKS.
See
Fig.
8.
To
test
the
function
of
the
negative
interlock install
a
circuit
_
aker following the instructions
given under
BREAKER
rfrSfelfeTloN
AND REMOVAL.
For
this
rest
the con-
trol
power circuits
in
the switchgear must
be
energized.
Lock
and Padlocks
Place
the
breaker
in
the ..DisconnectlTest" position
and
connect the secondary disconnect device by
pulling down on
the breaker handle and
inserting
the
level arm
into
the
break-
er.
This
will
actuate
the
spring-charging
motor
and charge
the
breaker-closing
springs.
push
the
sliding
link
located ott
tt
"
front of
the
left track to
the rear. Refer
to Fig.
g. This
will
cause
the
negative
interlock roller
on the breaker
to
depress
and
keep the breaker
in
the
trip
free mode. Leave the stiOing
link
in
the
rear
position
and attempt to
close the
breaker
usinl
the
control
switch.
Nothing
should
happen.
Now attempt
to
close the breaker by depressing the manual
close
button-The
closing
springs
will
discharge
but
the
breaker should remain
open.
Return
the sliding
link to
the
forward
position.
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