how many 12/2 cables per hole


Old 08-17-06, 12:49 PM
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how many 12/2 cables per hole

Mu question is about code requirements for the size of the hole through a stud or a joist to run 12/2 romex, I mean if I am running 2 or 3 or 4 ..... cables, how big the hole should be.
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Old 08-17-06, 01:22 PM
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For electrical purposes edges of holes can not be closer than 1 1/4" to the face of a 2x4 stud wall. So a 1" on center hole would be max.

I'm not sure on the floor joist but the 1 1/4" from face must be maintained and you cant bore the middle 1/3 of the joist or L/3. So if the joist is 9 foot long for example you cant bore the area from 3' to 6'. The maximum hole size is d/6 so I believe that is 1 3/16" or so but not more than 1 1/4 " maximum bore size as far as building codes go for a 2x8 floor joist. So I suppose this means you can bore a hole 1 3/16" or maybe 1 1/4 " anywhere in the area L/3 from the joist ends and maintaining 1 1/4" from the face.

Might want to get further input on the joist hole size so wait for other replies.

Last edited by Roger; 08-17-06 at 01:58 PM.
Old 08-17-06, 01:50 PM
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The hole needs to be large enough you can install the cables without damage. 4 #12 cables is a lot in a hole smaller than 3/4 or 7/8 inch or so. If you need to go larger just use notch plates if you have less than 1 1/4 inch between the edge of the hole and the edge of the board
Old 08-17-06, 03:20 PM
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Drill multiple holes. I don't recommend more than two cables per hole.
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