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NM Protection - Exposed Work #184402
02/09/09 06:10 PM
02/09/09 06:10 PM
I
InspectorE  Offline OP
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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Re: NM Protection - Exposed Work [Re: InspectorE] #184403
02/09/09 06:11 PM
02/09/09 06:11 PM
I
InspectorE  Offline OP
Member
Joined: Oct 2004
Posts: 51
Hudson WI USA
That should be 334.15(b), not 16..typo

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

Member
Joined: Jul 2004
Posts: 9,287
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.


Greg Fretwell
Re: NM Protection - Exposed Work [Re: gfretwell] #184409
02/09/09 08:07 PM
02/09/09 08:07 PM
L
LK  Offline
Member
Joined: Jan 2003
Posts: 1,429
New Jersey
Yup, it's all spelled out in the code.


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