NM thru brick

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augie47

augie47

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State Electrical Inspector (Retired)
If a NM cable is installed in a wood stud wall then turned out thru a hole in the brick to an exterior surface mounrted box (such as a disconnect), is it a requirement that the section of NM thur the brick wall be sleeved ?
 
augie47 said:
If a NM cable is installed in a wood stud wall then turned out thru a hole in the brick to an exterior surface mounrted box (such as a disconnect), is it a requirement that the section of NM thur the brick wall be sleeved ?
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No, and I never do... but I can guarantee someone will say differently... :grin:
 
stickboy1375 said:
No, and I never do... but I can guarantee someone will say differently... :grin:
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I'll add my two cents. If the nm is poured in place as the masonry is going up, then a sleeve is required but if the the wall was drilled, then no.

Rick
 
I am going to stir the pot a little and say it needs to be sleeved per Section 110.11 and also 334.12(B)(2) or maybe 334.12(B)(3)

Flame on :smile:
 
C3PO said:
I am going to stir the pot a little and say it needs to be sleeved per Section 110.11 and also 334.12(B)(2) or maybe 334.12(B)(3)

Flame on :smile:
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I wouldn't call a hole drilled through masonry a shallow chase (it's not 'covered', either), nor consider the wire 'embedded' in the hole.

Where is masonry considered 'deteriorating' to NM?

Not flaming, just commenting and asking.
 
C3PO said:
I am going to stir the pot a little and say it needs to be sleeved per Section 110.11 and also 334.12(B)(2) or maybe 334.12(B)(3)

Flame on :smile:
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If 110.11 were true, how would sleeving it stop it from still being a 110.11 violation?
 
C3PO said:
I am going to stir the pot a little and say it needs to be sleeved per Section 110.11 and also 334.12(B)(2) or maybe 334.12(B)(3)

Flame on :smile:
Click to expand...

In both 334.12(B)2 or 3 there talking about the nm being embedded, and we all agreed it would need sleeves
 
480sparky said:
Where is masonry considered 'deteriorating' to NM?
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Masonry can eat holes in human skin, I think it could eat NM as well.
Also if you look at some of the reccesed boxes and things that Arlington makes they always include a sleeve piece for where the cable goes thru the block/brick.
 
stickboy1375 said:
but I can guarantee someone will say differently... :grin:
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I do always sleeve myself in these cases, but I do not feel like it is really a big deal. For me it is mainly protection of the NM from the masons instead of the masonry.

I really did not want to let stickboy down on the above comment :grin:
 
C3PO said:
I do always sleeve myself in these cases, but I do not feel like it is really a big deal. For me it is mainly protection of the NM from the masons instead of the masonry.

I really did not want to let stickboy down on the above comment :grin:
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:grin: Thanks...
 
I know I've done many thousands of service calls, and not one has been due to the deleterious effects of masonry on NM cable. Sleep well.
 
mdshunk said:
I know I've done many thousands of service calls, and not one has been due to the deleterious effects of masonry on NM cable. Sleep well.
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I agree!

I haven't had a call back yet!
 
C3PO said:
Masonry can eat holes in human skin, I think it could eat NM as well.Also if you look at some of the reccesed boxes and things that Arlington makes they always include a sleeve piece for where the cable goes thru the block/brick.
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NM and human skin are a little different. Look at what 600volts and some amperage can do to human skin. What table do we use when derating skin in a load calc. 60 or 75 degree column ? :grin:
 
skin effect

skin effect

acrwc10 said:
NM and human skin are a little different. Look at what 600volts and some amperage can do to human skin. What table do we use when derating skin in a load calc. 60 or 75 degree column ? :grin:
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So this is what they mean by "skin effect"!:grin:
 
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