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Posted By: MikeW 20 foot conduit lengths? - 06/13/02 12:17 AM
I recently saw some, installed, ¾” RMC that appeared to be in 20 foot lenghts. [Linked Image] I think it was RMC because it looked like it had an outer galvanized coating. Is this o.k.? I have never seen 20’ lengths of conduit before? What does this forum think?
Posted By: Redsy Re: 20 foot conduit lengths? - 06/13/02 12:21 AM
The gym in my daughter's school has MH fixtures hanging from what appear to be 20' lengths of 3/4".
I think it must be plumbing pipe.
I know of no manufacturer of 20' length conduit.
Posted By: resqcapt19 Re: 20 foot conduit lengths? - 06/13/02 01:34 AM
While I don't know of any manufacturer of longer conduit lengths, the code does permit such lengths in 342.130 and 344.130.
Posted By: arseegee Re: 20 foot conduit lengths? - 06/13/02 02:21 AM
What you saw most likely was 20' galvanized pipe which looks like rigid on the outside but has a nasty weld seam on the inside which is perfect for ripping up insulation on your conductors!
Posted By: Bjarney Re: 20 foot conduit lengths? - 06/13/02 02:32 AM
arseegee-- Isn't galvanized water pipe in 21-foot lengths? The male threads are similar to GRC, but couplings leave a dead-giveaway part of the male thread exposed. Anyone?
Posted By: Bjarney Re: 20 foot conduit lengths? - 06/13/02 02:46 AM
Oops...it's PVC, but Carlon lists schedule 40 in 20-foot lengths. [And up to 8-inch!!]
http://www.carlon.com/Brochure%20PDFs/2B10%20-%20Conduit,%20Fittings%20and%20Accessories/Carlon%20Rigid%20Nonmetallic%20Utility%20Conduit%20&%20Elbows-2B10-p28-Mar01.pdf
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