how many cables per 3/4 drilled holes in joists?


Old 09-27-18, 09:15 AM
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how many cables per 3/4 drilled holes in joists?

Can I put 3 14/2 or 3 12/2 cables in a 3/4 bored hole without having to derate?
They will run more than 24", probably throughout the length of the floor of apartment before splitting off to the relevant rooms.
Old 09-27-18, 04:54 PM
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The code says you have to start derating when the current carrying conductors is more then 3 in a group. This includes cables. However, derating doesn't really effect anything untill you get to more then 9 current carrying conductors when using wire and cables with a 90 degree insulating rating.

To answer your question directly: Yes, 3 cables is fine. Of course my info is based on the NEC.

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