12 S&C Instruction Sheet 761-525
Installation
Installing Pipe Couplings with Piercing
Set Screws
WARNING
Failure to properly install pipe couplings with piercing
set screws can cause slippage of operating pipe,
resulting in improper operation of the switch, arcing,
equipment damage, or electrical shock .
STEP 7.
To properly install piercing set screws:
(a) Make sure the cutting tip of the piercing set
screw does not protrude through the body of
the clamp.
(b) Insert the operating pipe section into the
coupling and fi nger-tighten the clamp bolt(s).
(c) Adjust the operating pipe to the correct
length. Then, tighten the clamp bolt(s) to
fi nal tightness.
(d) Tighten the piercing set screw, piercing the
pipe, and continue turning until a fi rm
resistance is felt.
(e) Make sure the clamp bolt(s) are tight. See
Figure 8.
Piercing set screw in shipping position (cutting tip
does not pro trude through body of the clamp)
Operating pipe installed, clamp bolt fully tightened,
and piercing set screw in final position
Clamp bolt
Clamp
Coupling body
Piercing
set screw
Slug pierced
from pipe
Figure 8. Installing the pipe couplings with piercing set screws.
