NMB to porch light

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Dennis,

Excessive moisture or dampness sounds like an AHJ call, and the location in the country , might determine the AHJ's thoughts.
 
To my understanding stripped NM is not labeled, whether it is thhn or thwn doesn't matter to some AHJ. If it was labeled I think my inspectors would be ok with it.



Edit I see I type too slow.
 
Rockyd said:
Dennis,

Excessive moisture or dampness sounds like an AHJ call, and the location in the country , might determine the AHJ's thoughts.
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There is no question in my mind that it is a violation of code however many jurisdictions will allow you to strip the NM and use the wire inside even though it isn't marked.

If your inspector allows it then so be it-- I am just stated the code not necessarily what I think. Personally I have seen nm underground for 20 years with no problem. Would I do it? NO---
 
It's kind of like the verbage "arranged to drain".

In regard to NM in pipe, if its more than three feet, I would consider an alternative method, common sense is only so good, through so many sets of eyes.

I see NM in UG too, but I see it as an opportunity to upsell, better products, and gain a customer. Not that I'm cheaper, but I am in the long haul, because the knowledge level is different. Like talking to the farmer who has chicken coup burned down by his "friend" who thought he 'knew something bout lectricity'. He knows that the investment isn't going to be risked by calling a qualified person.

As my mother used to say -

Can't make checken soup, out of chicken $hit.
 
Here is what we will see in the 2008 NEC, a new section.

300.9 Raceways in Wet Locations Above Grade. Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered to be a wet location. Insulated conductors and cables installed in raceways in wet locations above grade shall comply with 310.8(C).
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jetlag said:
I read the post on NMB to AC . There was a short pvc outside up to DISC switch. The replies were the NMB must terminate in box before leaving the house and continue on with thwn. My guestion is if NMB runs thru outside wall into back of a surface mounted WP fixture box is the wire considered outside and against code? What if the box is flush mounted, does that make it not outside. I guess we should run NMB to the switch and short piece UF to light?
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There have been a few threads on this topic, though I don't recall any consensus. I just found this thread from 01/2006 only because it had a lot of replies.

Around here, NM in conduit outdoors violations happen regularly, I'd say roughly 50% of the AHJ's enforce it. It has been tightening up over time, I believe.

As far as a box mounted inside an exterior wall covered by a light fixture, I don't see any problem with that. The NM is not outside. Is the insulation of the wall outside? No. Neither is the NM, IMO.
 
Hard call

Hard call

georgestolz said:
There have been a few threads on this topic, though I don't recall any consensus. I just found this thread from 01/2006 only because it had a lot of replies.

Around here, NM in conduit outdoors violations happen regularly, I'd say roughly 50% of the AHJ's enforce it. It has been tightening up over time, I believe.

As far as a box mounted inside an exterior wall covered by a light fixture, I don't see any problem with that. The NM is not outside. Is the insulation of the wall outside? No. Neither is the NM, IMO.
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It seems if that if an inspector turns down Romex in raceway on exterior wall ,even if short piece , he would have to turn it down in surface mounted box because outer sheath is not even broken in raceway but in flush box which is just as much outside, the NM can wick fron moisture.
 
Here's another one for you jetlag.

Firstly, when is a conductor considered outside the building. It would appear as soon as it penetrates the exterior wall. Thus---NM should not be allowed to feed a/c units since the wire is not marked. I wish the NEC would put pressure on the wire manufacturers to label the wire in the cable.

Secondly, have you ever installed a weatherproof panel as the House Panel. Around here in NC there are thousands of WP panels that have NM cable fed into the box either thru the back of the box or sleeved up in a piece of 2" PVC. It has been done this way for years and now they tell us it is No Good. So throw away those outdoor panels unless you want to use a JB and splice all your homeruns.

There needs to be a better explanation or perhaps an exception for these scenarios.
 
I agree with Dennis

I agree with Dennis

Dennis Alwon said:
Here's another one for you jetlag.

Firstly, when is a conductor considered outside the building. It would appear as soon as it penetrates the exterior wall. Thus---NM should not be allowed to feed a/c units since the wire is not marked. I wish the NEC would put pressure on the wire manufacturers to label the wire in the cable.

Secondly, have you ever installed a weatherproof panel as the House Panel. Around here in NC there are thousands of WP panels that have NM cable fed into the box either thru the back of the box or sleeved up in a piece of 2" PVC. It has been done this way for years and now they tell us it is No Good. So throw away those outdoor panels unless you want to use a JB and splice all your homeruns.

There needs to be a better explanation or perhaps an exception for these scenarios.
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I agree 100 % . I have seen many outside panels with all home runs NMB and some with 2 " pvc running up outside to gable end of house with all conductor inside. Yet in same county I got turned down for running up corner of mobile home with pvc and romex to security light. There was an L B leaving the foundation with short piece pvc going under so I striped back the outer sheath to LB and got enouth slack from under trailer to strip back into pvc going under . He called me again because the conductors are not marked thnn or thwn and I told him they are all dual rated now. He let me slide that time but said dont do this again.
 
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