Pulling romex through holes drilled in joists


Old 08-07-03, 11:23 AM
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Pulling romex through holes drilled in joists

Finishing a basement w/ sheetrock ceiling and need to move existing wires and pull new wires through the joist space. Are there any requirements with respect to how this is done? What diameter holes? How many wires for any given sized hole? What will my inspector want to see? Thankx.
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Old 08-07-03, 02:23 PM
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Drill as small a hole as the wire will comfortably fit through -- probably about a 5/8" hole for single 12/2, or 3/4" for two. It would be better not to go larger than that.

Drill the hole exactly half way between the top of the joist and the bottom.

Do not drill within 3" of where the joist is supported at either end.

If you need to drill multiple holes, keep them at least 3" apart.

Although you can drill anywhere along the span if necessary, it would be better to stay out of the middle third of the span.

Route the wire through existing soffits if you can to eliminate the need to drill at all.

Yes, the inspector will want to see.
Old 08-08-03, 06:13 AM
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Thankx John. Regarding where I would be drilling, I plan on using this guidance from the Western Wood Products Association:

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