RGS Clamp

[Alwayslearningelec]

Whe running 3/4 or 1" RGS on concrete etc. surface would you always use a clamp back with the strap or sometimes just have the conduit directly on the surface as EMT sometimes is with a 1 hole strap? What would determine the use of a clamp back?

 

[Dsg319]

What is a clamp back?

 

[infinity]

Since RMC couplings are about 1/4" thick you would use a "back strap" behind the raceway to keep the distance off of the wall consistent. A rigid one hole strap would hold the conduit to the back strap and to the wall.

 

[LarryFine]

What is a clamp back?

My guess:

 

[hbiss]

Larry has it. Back strap. Use them to make up for couplings. Notice also that there is another countersunk hole behind where the conduit sits. For larger sizes in a horizontal run, you can put a large screw through that hole then your conduit strap screw. Two screws are better than one.

-Hal