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#80948 06/12/02 07:17 PM
Joined: Jun 2002
Posts: 35
M
MikeW Offline OP
Member
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?

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#80949 06/12/02 07:21 PM
Joined: Mar 2001
Posts: 2,056
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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.

#80950 06/12/02 08:34 PM
Joined: Nov 2000
Posts: 2,148
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While I don't know of any manufacturer of longer conduit lengths, the code does permit such lengths in 342.130 and 344.130.


Don(resqcapt19)
#80951 06/12/02 09:21 PM
Joined: Jan 2002
Posts: 324
A
Member
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!

#80952 06/12/02 09:32 PM
Joined: Apr 2002
Posts: 2,527
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Moderator
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?

#80953 06/12/02 09:46 PM
Joined: Apr 2002
Posts: 2,527
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Moderator
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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