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· Registered
3 Posts
Discussion Starter · #1 · (Edited)
I have an unfinished detached garage with a second story studio apartment type space above.

I want to understand the requirements for drilling holes in 2x4 wood stud walls for electrical wiring.

I need to run some wiring (14-2, 14-3, 12-2) to a six gang box for switches.

How big of a hole can I drill through the top-plate?
The general rule I find and hear about appears to be 3/4" holes into the center of the stud. That leave a minimum of 1-1/4" from either edge.

How close can the holes be to each other?
Is it 1-1/4" spacing for a 3/4" holes?
If so, is that 1-1/4" spacing from the center of one hole to the center of the second hole?
Or is that spacing from the edge of one hole to the edge of the other hole?

How many wires can I pull through a 3/4" hole? I typically see 2, sometime 3.

And BTW, I attached a picture of the panel and facing the same problem.



· A "Handy Husband"
15,070 Posts
Drill 3/4 in the center and pull 2 cables and you will be fine

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· Remodel and New Build GC
11,776 Posts
I've had to drill a topplate for both numerous feeds (3/4 centered) probably 2-3 inch spacing and never had a problem.

I've had to drill a top plate for service cable, and the BO allowed me just to simpson strap around it.

I would be interested in knowing any exact code in that regard.

· Registered
8,186 Posts
Here is what I do that passes inspection. 2 cables in a 3/4” hole. 3/4” holes on at least 2” centers. Drill holes in the centers of the studs. Any wire that will be less than 1 3/8” from the finished surface of the wall gets a metal plate. For wall finish, use screws that penetrate the studs no more than 3/4”.
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