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Old 09-27-2008, 07:44 PM   #1
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elec wiring though framing members


Could anyone tell me if ther are any rules that pertain to how many electrical cables ie nm14/2, nm12/2 etc that can be run through a single hole bored into a stud, rafter etc? example: 5/8 hole bored in a rafter. Three nm 14/2 fit through the hole with no problem at all. Is three ok? Is it whatever fits is ok, or is ther some rule? thanks

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Old 09-27-2008, 07:57 PM   #2
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elec wiring though framing members


I don't believe that there is but I could be wrong. I do know however taht you can only have the holes drilled at certain intervals and must be so far from each edge. Donlt know what they are off hand but someone else could probably tell you that.

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Old 09-27-2008, 09:34 PM   #3
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elec wiring though framing members


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Could anyone tell me if ther are any rules that pertain to how many electrical cables ie nm14/2, nm12/2 etc that can be run through a single hole bored into a stud, rafter etc? example: 5/8 hole bored in a rafter. Three nm 14/2 fit through the hole with no problem at all. Is three ok? Is it whatever fits is ok, or is ther some rule? thanks

The only time that it is a problem is if the hole will be fire or draft-stopped, (334.80 of the NEC) then de-rating could be a problem.
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Old 09-27-2008, 10:19 PM   #4
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elec wiring though framing members


In wood construction, you can drill some pretty good sized holes. Occasionally there are inspectors that interpret the "bundling" code to mean even for a very, very short distance where the wires pass through a framing member. Personally, I don't get excited about that. I wouldn't get worked up about 3 wires in a hole, but the best advice is keep the amount of wires in the holes to a minimum.

Hole boring requirements of the I-codes...

Rafters/ceiling joists/floor joists: You can drill a hole up to 1/3 the depth of the member. Holes of any size cannot be drilled within 2" of the top or bottom of the member.

Studs: You can drill up to 40% of the depth of a stud. Holes must be at least 5/8" from the edge.
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