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Old 01-24-2012, 09:32 PM   #1
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Can somebody point me to the tables for :


# of wires through certain size of hole

and

# of wires per box size

???

Please and thank you.

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Old 01-24-2012, 09:48 PM   #2
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Can somebody point me to the tables for :


# of cables in a hole drilled in a stud? I try to limit it to 3 cables of 14 ga or 12 ga in a 3/4" hole. Sometimes 4 but not too often.

Box fill can be found in section 314.16, and reference tables 314.16(A) & 314.16(B).

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Old 01-24-2012, 10:02 PM   #3
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Can somebody point me to the tables for :


Bottom line on hole fill is, with cables #14, #12, & #10, you can have up to 9 current carrying conductors in almost any installation before derating is an issue. This means neutrals and hots, except for 3-wire home runs, which the neutral does not count as a CCC.
So...you can have up to eight cables in a hole before any derating is needed.
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Answers based on the 2008 & 2011 NEC.
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Old 01-24-2012, 10:06 PM   #4
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Can somebody point me to the tables for :


Quote:
Originally Posted by Speedy Petey View Post
Bottom line on hole fill is, with cables #14, #12, & #10, you can have up to 9 current carrying conductors in almost any installation before derating is an issue. This means neutrals and hots, except for 3-wire home runs, which the neutral does not count as a CCC.
So...you can have up to eight cables in a hole before any derating is needed.
So to clarify : the neutral and hot count as current carrying conductors, so each piece of 12-2 romex cable going through a hole counts as 2?

By that logic if I run a piece of 12-3 for some distance, that counts for 3 current carrying conductors?
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Old 01-24-2012, 10:21 PM   #5
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Can somebody point me to the tables for :


Quote:
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So to clarify : the neutral and hot count as current carrying conductors, so each piece of 12-2 romex cable going through a hole counts as 2?
Yes.

Quote:
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By that logic if I run a piece of 12-3 for some distance, that counts for 3 current carrying conductors?
No. The neutral of a 3-wire home run only carries the current imbalance, so it is exempted from being a CCC.
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