S&C Omni-Rupter Series, Installation And Operation Manual

S&C Instruction Sheet 765-510    27

Figure 30. Key-interlock group detail.

Locking 
disc

Interlock 
bracket

Figure 29. The foot-bearing assembly and operating-handle 

assembly.

Handle

Piercing set screws

(b)  Install the operating-handle assembly on the 

lowest section of vertical operating pipe at 
the location indicated in the erection 
drawing. Make sure the cutting tip of the 
piercing set screw in the operating-handle 
assembly does not protrude when installing 
the assembly on the vertical operating pipe. 
After the operating handle is in place, tighten 
the piercing set screw on the operating-
handle assembly, piercing the pipe. Continue 
turning until a fi rm resistance is felt. See 
Figure 29. 

(c)  Attach the interlock bracket to the foot-

bearing assembly, using the 

½

–13 

×

 1 screws 

and lockwashers furnished.

(d)  Attach the key interlock to the interlock 

bracket and extend the bolt.

(e)  With the interrupter switch in the

 Closed 

position, use the interlock bolt to position 
the locking disc so the bolt enters the closed-
position slot in the disc (and will enter the 
open-position slot when the switch is in the 

Open

 position). Hold the locking disc 

⅜

-inch 

below the interlock bracket (see Figure 30) 
and drill 

7/16

-inch holes through the vertical 

operating pipe section, using the holes in the 
locking-disc collar as pilots. Attach the 
locking disc to the pipe using the 

⅜

–16 

×

 3 

bolt, nut, and lockwasher furnished.

(f)  Block one of the two slots in the locking disc 

with the blocking screw provided. The slot 
to be blocked will be determined by whether 
a locked-open or locked-closed arrangement 
is required.

NOTICE

Key interlocks are intended for proper 
sequencing of switching operations; they 
are not intended to provide security. The 
operating-handle assembly includes swing-
away hasps for padlocking the interrupter 
switch in either the 

Open or Closed position.

Complete the operating-handle installation as directed 

in Steps 10 through l4 on pages 16 and 17. Proceed to 
page 28 for instructions on checking switch operation and 
adjustment.

⅜

-inch

(9.5 mm) 

Installation