RMC vrs GRSC

[billyzee]

I have a PE telling me that all references to RMC in a drawing package should be changed to GRSC.

Rigid metallic conduit is a category recognized by the NEC. I do not see any reference to GRSC in the NEC. RMC includes both aluminum and steel.

I have concluded that GRSC is a subset of RMC. Is there a type of RMC that is not GRSC but can be buried. Some sort of coated or treated aluminum perhaps.

 

[tom baker]

There is PVC coated rigid metallic conduit.

 

[cschmid]

not to be dum but what is GRSC?

 

[billyzee]

GRSC means galvanized rigid steel conduit.

 

[cschmid]

ahh said the blind man as he picked up his saw and hammer..

 

[benaround]

billyzee,

344.2 (NEC 2005) " RMC is generally made of steel with protective coatings

or aluminum. Special use types are silicon bronze and stainless steel."

 

[paul]

If I see the letters 'RMC' on any print or spec, I'm going to ASSUME it's GRS unless specified otherwise. The other types are not very common.

 

[76nemo]

There is PVC coated rigid metallic conduit.

Funny, we just talked about this elsewhere last month. No one else ever heard of Robroy? Don't see a whole lot of it.


http://www.plastibond.com/

 

[mdshunk]

I wonder if that PE was having lots of trouble with guys substituting really expensive metallic rigid conduit types where rigid steel would have sufficed? This seems like a detail that could be left out. Just be specific if you want something weird.