Are the threads the same? Does it meet National Electric Code?
2007-03-27 04:04:40 · 9 answers · asked by Anonymous in Home & Garden ➔ Do It Yourself (DIY)
I'm using EMT and LBs to get from the panel (indoors) to outside and feed a hot tub. EMT because it's partly exposed (under the deck) and needs to be in pipe. Neither Lowes nor Home Depot had all of the fittings in one material, but between them EMT was available. The LBs are RGC threaded and I need two 1"x4" nipples. It's either a special trip to the elec supply, or have HD cut and thread. I think HD will want to use water pipe.
2007-03-27 04:56:44 · update #1
You don't need threaded pipe to connect the LB's. Just get 1" EMT compression (not set-screw) connectors, remove the locknuts and thread them into the LB's, then slip the cut and reamed 1" EMT nipples into the connectors and lock the caps down with a pair of channellocks. Comression connectors are considered weatherproof in that installation.
It is a violation of the National Electrical Code (and all local codes) to use galvanized water pipe for an electrical raceway. Besides the fact that its not UL listed for that use, the threads are not considered to form an effctive grounding path.
Question -- since it's going under the deck and therefore not exposed to mechanical damage -- why don't you use electrical PVC conduit and fittings? I assume you would be pulling a ground wire anyway and that would be the most waterproof installation. And you are installing this circuit on a dedicated 2-pole GFI breaker, correct?
2007-03-27 10:00:25 · answer #1 · answered by c_kayak_fun 7 · 0⤊ 0⤋
Galvanized Electrical Conduit
2017-01-03 13:25:07 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Emt Vs Rigid Conduit
2016-10-15 22:03:40 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The first answer is definitely wrong. Water pipe is NOT "much more conductive" and while thin wall conduit has more room inside, rigid metal conduit, which can't be bent (easily) is the same standard as water pipe as the second answer states. I would expect that using water pipe would require considerable care that it did not have a sharp inner edge at the ends which I hope would be removed in stuff sold as conduit to avoid cutting the wire insulation.
2016-03-18 05:58:47 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Your question confuses me. Are you using EMT of RMC? EMT has no threads, period.
I'm not familiar with "RGC" threads. I do know that a 1" rigid fitting will thread nicely on a 1" galvanized water pipe, even though conduit threads are straight and pipe threads are tapered. That's why rigid fittings are marked "not for plumbing use".
If you are, indeed, using RMC, why not walk over to the plumbing section and pick up a couple of 4" nipples?
2007-03-27 07:46:58 · answer #5 · answered by Hank 3 · 0⤊ 1⤋
Water pipe has different threads. They are tapered in order to seal when they are tightened up. The pipe is the same, but rigid pipe threads are straight. I don't think it would hurt if you used water pipe, and no one can tell, just by looking at a joint that is already made up.
2007-03-27 07:55:57 · answer #6 · answered by poppyman54 5 · 0⤊ 1⤋
Threads are not the same. You want to use this for electrical?? A little overkill as it is a much heavier pipe. After all, it is an additional covering to protect the wire underground.
2007-03-27 04:34:37 · answer #7 · answered by ButwhatdoIno? 6 · 0⤊ 1⤋
You could, but the water pipe has much thicker walls, and will be much heaver. Not to mention more expensive.
2007-03-27 05:16:36 · answer #8 · answered by Anonymous · 0⤊ 1⤋
Yes to all of the above.
2007-03-27 05:10:16 · answer #9 · answered by Anonymous · 0⤊ 1⤋