Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Ok just had a huge argument....someone started yelling at me because I thought that RMC and RGS/GRC was two different types of conduit but he said they are exactly the same thing.
Yes they are, and why not?guess I weas wrong and GRC/RGS is the same as RMC. I also guess you can't buy either RMC and GRC/RGS..or can you??
Yes they are, and why not?
RMC doesn't necessarily have to be galvanized or steel. They can be different.
You can get rigid metal conduit made of aluminum, stainless steel, and I have heard ungalvanized steel although I have never seen the latter. If a spec says GRC it means galvanized rigid conduit, if a spec says RMC it's not really clear what is required.
Article 344 covers Rigid Metal Conduit: Type RMC.
344.2 defines several types - steel, aluminum, red brass, & stainless steel.
"GRC", "RGS", etc., are informal, unofficial, slang abbreviations for "Galvanized Steel RMC. I've also seen "RGC" & "GRS".
If one of those abbreviations is shown on the drawings, it should also be defined somewhere on the drawings.
RMC is not always GRS, but it's not worth arguing about or losing a job over.
db
If it just says 'rigid conduits' you better submitt an RFI - PVC is a 'rigid conduit'.Ok so if a spec reads that all power distribution cables are to be in rigid conduits what is your feeling about the information given regarding the conduit?
Rigid is not always galvanized steel. We run miles of conduit in a given year and very little of it is galvanized. Unless an equipment supplier specifies galvanized steel or we are installing in an area subject to damage we use aluminum.
I am surprised you have a job as an electrical estimator by some of the questions you ask here.
It is obvious that you don't have any construction experience.
RGS, GRC, RMC all the same. Rigid Steel Galvanized Conduit.
Power cables can most certainly be installed in PVC.Ok so that's my question. If it says to run power distribution cables in "rigid conduit" you don't automatically assume and use rgs? I mean power distribution cables are not goging to be run in PVC so what else is left in the "rigid" family. I guess just either alum or steel is left!!?? Thanks.
Power cables can most certainly be installed in PVC.
They 'Probably' do mean galvanized steel RMC, but "rigid conduit" does not fully or properly define their intent. Submit an RFI.
db
Ok so if a spec reads that all power distribution cables are to be in rigid conduits what is your feeling about the information given regarding the conduit?
I am surprised you have a job as an electrical estimator by some of the questions you ask here.
It is obvious that you don't have any construction experience.
RGS, GRC, RMC all the same. Rigid Steel Galvanized Conduit.