run nm through short length of conduit?

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Old 08-19-14, 07:11 PM
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run nm through short length of conduit?

Hello, I will be running 6/3 wG through my unfinished basement to the opposite end of the house for a hot tub disconnect subpanel. My question is how best to get from inside the basement to the subpanel outside? I was thinking a short length of pvc conduit through the rimboard into an LB and up approximately 2' to the panel. But I have two reservations with this: 1) I'm not sure I can run the nm through conduit (even short lengths) and 2) I'm not sure the 6/3 can turn 90deg up in the LB.

What's the best way to handle this? And thanks!
 
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Old 08-19-14, 07:22 PM
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With such a short run, you may be better able to use a sweep than an LB. Others may have better ideas, so hang in there.
 
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Old 08-19-14, 07:56 PM
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Is the subpanel mounted outside? If so you can run NM-b through the back of subpanel but if it is outside you can not run NM-b outside and up to it for even 2".
 
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Old 08-20-14, 03:56 AM
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Yes, the subpanel is outside. But it is (or will be) higher than the rim joist, so I guess I need to either enter the wall above (a bathroom) and then into the subpanel, or use a sweep and short length of conduit. I just wasn't sure I could put nm in conduit.
 
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Old 08-20-14, 07:02 AM
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You probably need a junction box inside the basement where you transition from NM cable to THWN conductors in the conduit.
 
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Old 08-20-14, 08:44 AM
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the inspectors here permit a vertical conduit to an outside box to contain NM for mechanical protection.....either up to the attic or down under the house

we do not have the build up of water in our vertical pipes as some seem to.

i called and they use ART. 334.15 (B) "Protection from Physical Damage"
 
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Old 08-20-14, 09:14 AM
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Of course all code is local but you can't base your work on how code is applied somewhere else. Best not to use NM-b outside.
 
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Old 08-20-14, 10:29 AM
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NM is permitted to be sleeved against physical damage. The code does not permit NM to be used outside even if in conduit.
 
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Old 08-20-14, 10:50 AM
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Okay, so then my only choice is to use a junction box inside and use thhn/thwn to the subpanel or somehow get the NM up into the wall and then into the back of the subpanel.
 
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Old 08-20-14, 11:49 AM
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You could put a weather proof box outside and run into the back. Then just run your conduit from there.
 
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Old 08-20-14, 01:56 PM
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Of course all code is local

ray is right

you should ask the inspector who will look at your job.
 

Last edited by ray2047; 08-20-14 at 02:18 PM. Reason: Clean up quote.
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