House wiring: More than 2 wires permitted in one hole?


Old 03-11-06, 11:18 AM
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Arrow House wiring: More than 2 wires permitted in one hole?

Hello everybody. I am wiring my new home. I am drilling at this time, mostly 7/8 holes for 2 wires. Question is, how many wires (romex) can I run through a single hole? If quarters are tight, can I drill a larger hole to run say, 4 wires (for 4 circuits) from the basement to the 2nd floor? Thanks for any help
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Old 03-11-06, 11:34 AM
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In general you should not run more than two cables through a single hole. There are several reasons for this. The main reason is that the hole will need to be larger for more than two cables. Holes through wood must be at least 1.25 inches from the edge of the wood, or nail plates must be used to prevent potential damage to the cables.

What this means is that your 7/8 inch holes MUST be centered on any 3.5 inch pieces of wood (this means 2x4 studs, etc.).

If you make your holes off center or larger then you will need nail plates.

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