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Fig.4
Racking Mechanism
Fig.
5
Lift
Truck
Interlocks
After
the breaker
has been
racked
fully into
the connected
position
and
then is removed
from
the
unit,
the engagement
and alignment
of
the primary
disconnect
fingers
on
the
breaker
studs
may
be
checked
with
respect
to
the
stationary
conductor
in
the unit.
THE
SWITCHGEAR MUST
BE
DE.ENERGIZED FOR THIS CHECK.)
Use
the
racking handle
to turn
the
jackscrew
several
turns
toward
the connected
position, until
the shutters are
opened
to
uncover the
opening
to
the
insulation
tube and
stationary
conductor
in
the unit.
Inspect
the
impression made
in
the
coating of contact
lubricant
A282A2048 P009
on
the
station-
-.y
conductor
surface
by
the breaker primary
disconnect
gers:
''
On
1200
and
2000
ampere
ratings,
there must
be heavy
im-
pressions
of all
fingers on both the top and bottom of
the
stationary conductor bar. The
impressions
should
extend
I
-
Racking
Position Indicator
2
-
Rdcking Shaft
3
-
Rail
4
-
Silft
Bearing
5
-
Racking
Nut
6
-
Jack
Screw
7
-
Interlock
I
-
Lift Truck
Brace
2
-
Wheel
Locking
Plate
3
-
Truck Locking
Bar
Handle
4
-
Safety Latch
Handle
back
from the front
end
of
the
bar
a
minimum of
.50
inch
(l2.7MM)
and should
be
no
closerthan.187
inch(4.748MM)
to
either
side
of
the
bar.
On
3000
ampere
ratings,
there
must
be
heavy impressions
of all the
fingers
on
the
cylindrical
conductor. The impres-
sions
should
extend back
from
the
front
end
of
a
minimum
of
.50
inch
(l2.7MM).
IF THE CONTACT WIPE IS NOT PROPER.
DO
NOT
MAKE ANY ADJUSTMENT. COMMUNICATE WITH
THE NEAREST GENERAL ELECTRIC COMPANY AP-
PARATUS
AND
SERVICE ENGINEERING OFFICE
FOR INSTRUCTIONS.
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