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tibbsy 08-25-2007 06:43 PM

running 14-2 romex
does anyone know how many runs of 14-2 you can put in a 1" hole in a stud ? and can you increase the size of the hole to 1 1/2 " for more wires ?

Speedy Petey 08-25-2007 07:06 PM

This is a contentious question, but the bottom line is four cables would never be a problem in a 1" hole.

You cannot go bigger than 1" in a 2x4. In fact if you do go with 1" keep the hole DEAD CENTER in the framing. You need to stay 1.25" from the edge of the framing.
7/8" is a better choice.

chris75 08-25-2007 07:23 PM

Pay attention to 334.80, where more than two NM cables containing two or more Current Carrying Conductors are bundled together and pass through wood framing that is to be fire- or draft-stopped, the allowable ampacity of each conductor shall be adjusted in accordance with Table 310.15(B)(2)(a).

Speedy Petey 08-25-2007 07:40 PM

Not wanting to get into the details of the code, or to get into the interpretation of 334.80, that is what I meant about it being a contentious issue.

A) As long as you stay under nine CCC's (current carrying conductors) there is NO issue with derating #14, #12, or #10. Ten or more CCC's derating becomes an issue.
Four 14/2's is eight CCC's.

B) Aside from the fire stop issue, not all AHJs consider running cables loosely through bored holes "bundling". In fact I see more that do not than do.

chris75 08-25-2007 08:34 PM

I know it was a little too much info, but I still wanted it disclosed...

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