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51
IB-65020A
Recommended Renewal Parts and Replacement Procedures
document the distance that the
front terminal clamp (10) is screwed
onto the threads of the vacuum
interrupter (3). It is important to
document the location of these
devices to enable proper future
reassembly.
Note:
It is important to observe and
document the location and
orientation of the shunt (6) to enable
future proper reassembly. Notice that
the shunt points in the same direction
as the label on the vacuum interrupter
(3), as well as the two bolt holes on
top of the vacuum interrupter (3).
xiii. Unscrew the front terminal clamp
(10) and the shunt (6). It may be
necessary to wedge a screw driver
blade into the slot of the front
terminal clamp (10) only enough to
easily remove the clamp.
b. Assembly
Note:
Refer to documentation required
in
Ch 6 Recommended Renewal
Parts and Replacement
Procedures,
c. r
eplAceMent
p
rocedureS
, 1) Vacuum Interrupter
Assembly,
a. Disassembly
, steps
vii through ix.
i. Prior to assembly, clean all parts,
including the high voltage housing
(11) with denatured alcohol.
ii. Screw the front terminal clamp (10)
and the shunt (6) back on the new
vacuum interrupter (3).
Approximately 1 to 3 threads of the
vacuum interrupter (3) should be
visible beneath the lowest surface
of the front terminal clamp (10).
The label of the vacuum interrupter
(3) should be pointed in the same
direction as the shunt (6), as well
as in the same direction as the two
holes in the top of the vacuum
interrupter (3).
Note:
The vacuum interrupter label should
be visible from the back side of the
circuit breaker.
iii. Hold the front terminal clamp (10) in
place to prevent it from tilting and
torque the socket head bolt (10) to
30 ft.-lbs.
iv. Screw the vacuum interrupter
(3) and the assembly onto the
operating pushrod (4) until it stops.
v. Tilt the vacuum interrupter (3) and
the assembly back up to its original
position and look down through
the two holes of the upper primary
assembly (18) to assure that they
align with the bolt holes in the
vacuum interrupter (3). If the device
bolt holes do not align, follow these
steps:
aa. Hold the high voltage regulator
disc (13) with channel lock pliers
and loosen the two hex head
nuts (46) only enough (no more
than 3 turns) to enable rotation
of the whole assembly by hand
with no resistance.
ab. Align the hex head cap screws
(32) to the threads of the
vacuum interrupter (3).
ac. Insert a 1½” temporary bolt of
the same thread size as that was
removed through the upper
primary assembly (18) and into
the vacuum interrupter (3).
ad. Tighten the temporary bolt
enough to pull the vacuum
interrupter (3) back up, which
will start opening the contacts
inside.
