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#184402 - 02/09/09 06:10 PM NM Protection - Exposed Work  
InspectorE  Offline
Member
Joined: Oct 2004
Posts: 51
Hudson WI USA
Section 334.16(b)requires that NM used in exposed areas be protected with conduit or other approved means. Does the code indicate minimum diameters for various NM sizes similar to the conduit fill tables? Or is the amount of space taken up by the NM irrelevant with respect to conduit diameter? If so is it left to the installer's judgement?


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#184403 - 02/09/09 06:11 PM Re: NM Protection - Exposed Work [Re: InspectorE]  
InspectorE  Offline
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Joined: Oct 2004
Posts: 51
Hudson WI USA
That should be 334.15(b), not 16..typo


#184405 - 02/09/09 06:43 PM Re: NM Protection - Exposed Work [Re: InspectorE]  
gfretwell  Offline


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Joined: Jul 2004
Posts: 9,103
Estero,Fl,usa
You use the circular size defined by the widest dimension of the cable. For flat Romex that makes a pretty fat "conductor". A 12-2 is about .4" which puts it between a #2 and a #1 THHN. Generally I will make some concession if this is a single straight run down a wall.


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#184409 - 02/09/09 08:07 PM Re: NM Protection - Exposed Work [Re: gfretwell]  
LK  Offline
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Joined: Jan 2003
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New Jersey
Yup, it's all spelled out in the code.



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