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NM Protection - Exposed Work #184402 02/09/09 05:10 PM
Joined: Oct 2004
Posts: 53
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InspectorE Offline OP
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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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Re: NM Protection - Exposed Work [Re: InspectorE] #184403 02/09/09 05:11 PM
Joined: Oct 2004
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InspectorE Offline OP
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That should be 334.15(b), not 16..typo

Re: NM Protection - Exposed Work [Re: InspectorE] #184405 02/09/09 05:43 PM
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gfretwell Offline
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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.


Greg Fretwell
Re: NM Protection - Exposed Work [Re: gfretwell] #184409 02/09/09 07:07 PM
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LK Offline
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Yup, it's all spelled out in the code.


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