20 S&C Instruction Sheet 761-545
Installation
If none of the switch poles are fully closed,
the effective length of the vertical operating
pipe may need to be increased. Loosen the
vertical operating-pipe clamp bolt on the lowest
rod-guide (or bell-crank) coupling. See Figure
29. Move the operating handle approximately
20 degrees from the Closed position and then
torque the rod-guide (or bell-crank) coupling
clamp bolt. Then, move the operating handle
to the fully Closed position and recheck for
adherence to the conditions described above.
In the unlikely event that only one or two
switch poles are fully closed, loosen the clamp
bolt(s) on the interphase pipe coupling(s) at
the affected switch-pole operating lever and
reposition the pipe coupling to increase or
decrease the effective length of the interphase
operating pipe. Torque the clamp bolt of each
pipe-coupling clamp to final tightness. Tighten
the associated piercing set screws, piercing the
pipe, and continue turning until a firm resis-
tance is felt. See Figure 30.
(c) With the operating handle as far as it will go in
the opening direction, the switch blades are
90 degrees from the Closed position. See
Figure 31.
In the unlikely event the above-described
condition is not met, more switch blade travel
is required. Move the operating handle to its
mid position to take the strain off the operating-
pipe linkage. Secure the handle in that position
by inserting a ⅜-inch bolt or metal pin into the
hole provided.
Figure 29. Increasing the effective length of vertical
operating pipe.
Clamp bolt
Lowest section
of vertical
operating pipe
Pipe couplings
Figure 30. Readjusting the interphase pipe.
Clamp bolt
Figure 31. Checking the switch blades are 90 degrees from
the Closed position.
90°
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