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Step 9—Installing Operating Mechanism
Either a swing handle or a worm gear
mechanism is (normally) supplied for manual
switch operation.
Swing Handle Operator
To install the swing handle operator:
With ground strap in place on vertical operating
pipe, slide handle and handle lock plate over the
end of the vertical operating pipe. Fasten the lock
plate at the proper location. Recommended height
for the lock plate is 3 ft. 6 in. above ground.
Note: The lower end of the vertical operating pipe
should extend through the lock plate at least 3
inches. It may extend as much as 3 feet or more,
just so it doesn't touch the ground or column
footing.
The lock plate assembly (Fig. 8) consists of two
castings, mounted on the pipe guide plate, which
can be easily adjusted in an arc to provide the
required rotation.
These act as locks for the
manual operating handle when it is dropped from
the operating position. The handle must be raised
to a horizontal position for operation. With the
switch in the fully closed position, set the handle
clamp so its set screws are 4 inches above the lock
plate and its vertical centerline is at or near as
possible to the closed position, see Fig. 8.
Temporarily fasten the handle to the pipe with the
set screws. Operate the switch and move the
adjustable lock castings until they exert pressure
against the handle in both the open and closed
Fig. 5 Worm Gear Operator
Fig. 6 MO-10 Motor Operator
positions of the switch. This provides a slight
torsional wind-up in the operating pipe. Tighten the
two piercing set screws on the handle clamp until
holes are punched into the pipe and continue until
the screws are firmly seated.
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P a g e
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