Buried Rigid conduit

[Ainsley Whyte]

Can any one tell if there is any sealant used when buried rigid conduit ,what the code said about burying rigid conduit is it number of threads requirements

 

[oldsparky52]

344.10 for uses permitted, 300.6 should make you use something on the field cut threads. This product meets that requirement. The only place I remember the number of threads being mentioned is in the explosion proof work. No matter what the connections need to be wrench tight.

 

[infinity]

Where does it say that RMC has to be wrench tight? If you spin on an elbow and it only turns 3/4 of the way you'll back it off that 3/4 of a turn.

 

[oldsparky52]

Where does it say that RMC has to be wrench tight? If you spin on an elbow and it only turns 3/4 of the way you'll back it off that 3/4 of a turn.

250.92(B)(2)
314.23(E) & (F) & Exception (2)(f) & (H)(2) (Googled this), but this is not your point.

I guess I stand corrected (thanks), it's an old habit from doing x-proof work, everything had to be wrench tight to insure a good ground connection on conduits.

 

[LarryFine]

If you spin on an elbow and it only turns 3/4 of the way you'll back it off that 3/4 of a turn.

That's why I usually wait until my run is assembled and I'm screwing the elbow on before tightening everything. As I rotate the elbow, the loosest joint in the run will rotate, and all of the joints will eventually be tightened to the same degree.

Once I get to the point I believe I can not get another whole rotation, I stop at the correct position of the elbow. The result is that all joint are equally tight and, more importantly, I will not have to loosen any joint after I have tightened them.