Latest Discussions : Electrical & Lighting


11:04PM | 06/29/01
Member Since: 10/03/00
15 lifetime posts
I am running new sheathed electrical cable to a new service panel in the garage. How many wires (mostly 12gage) can I put through holes in the framing? What size holes?


02:43AM | 06/30/01
Member Since: 09/01/00
312 lifetime posts
I am not sure there is a code as to how many wires you can run through framing, but you will be limited by how large a hole you can make without compromising the durability of the frame.You will probably want to make several (say 1 1/2") holes in the center of the framing.On an 8'stud you could probably get 16 or more holes holding 4 cables each or 64 lengths.Thats alot of wire.


09:17PM | 06/30/01
Member Since: 06/22/01
5 lifetime posts
Their is a NEC code,but I'de have to look it up. Best to only put a few lines in each hole and that way all works out...


04:29AM | 07/02/01
Member Since: 03/13/00
1674 lifetime posts
Just an aside...
Don't run phone lines, TV coax, or any other kind of signal cable in the same holes with the sheathed electrical cable. It will compromise the quality of your phone/tv/whatever service. If at all possible, keep other lines a couple of inches from sheathed electrical cable EVERYWHERE. Especially if you use a computer.


03:38PM | 07/03/01
Member Since: 07/02/01
5 lifetime posts
The hole drilled through the framming member(2x4)shouldn't be larger than 3/4". Due to the electrical code that deals with protecting wires from damage. Any hole that is used for passing wires through has to be 1 1/4" from the face of the stud to the edge of the hole, or it has to nail plated. actually you can use a 15/16"
bit, but you have to keep the 1 1/4" clearance in mind. Using a 3/4" bit you should only put two 12/2's through that hole. Using a 15/16" bit you can get 3 12/2's through that hole. When pulling multiple wires through one hole be very carfull not to cause a friction burn on the other wires in the hole.


06:09PM | 07/27/01
Member Since: 11/14/00
333 lifetime posts
Regardless of whether it is Code or not, you should only feed one wire through one hole. Drill a separate run of 3/4" holes for each wire your run, even if they run parallel to each other. Doing so helps keep things clear, such that a problem in one line stays in that line and so on. It also helps you keep track of what line is what, and helps inspectors do the same. Little details like that will impress your inspector and make him scrutinize your project less tightly. The only exception is where space or acces restrictions absolutely require you to run more than one wire through a hole. I have done so only once, and even there I drilled two holes to spread the load even though I could have fit all four wires through the same hole. Drilling more holes is really not all that tough.

Christopher Sparks

04:47PM | 08/10/01
Member Since: 08/09/01
29 lifetime posts
There is nothing in the National Electrical Code that states how many nonmetallic-sheathed cables can be run in a single hole. However your local municipality which has jurisdiction over the National Electrical Code may have it's own ruling.
Article 300-4. "Protection Against Physical Damage" in the National Electrical Code book is the only thing that covers anything about nonmetallic-sheathed cables being run parallel , perpendicular or even through framing members

I have the 1999 latest version of the National Electrical Code book (the 2002 version won't be available until October) on my computer, if you have any question on the issue you can always email me at I will be glad to send you the article #'s and the text that the article contains.


03:13PM | 08/10/16
I have a '70's house with aluminum wiring. Can I run it through holes in the studs, as I would copper?Presently, all wiring seems to come from the ceiling down to outlets, never going through a stud.


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