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Number of wires allowed thru a 1-1/2" hole drilled in a joist

Number of wires allowed thru a 1-1/2" hole drilled in a joist

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  #1  
Old 01-15-13, 07:04 PM
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Number of wires allowed thru a 1-1/2" hole drilled in a joist

Started worrying about this a little late, but how many wires are allowed thru a 1-1/2" hole drilled in the floor joists. Attached are pic's of what I have done so far.

I appreciate any guidance and comments.

Dano

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  #2  
Old 01-15-13, 07:28 PM
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The wires should fit comfortably and not be jammed in.

The only code infraction that could be called in to play here is bundling.

Personally I think you are fine.

A little blurp on bundling.

Copper.org: Copper In Your Home: Home Planning Series - House Wiring “Bundles” Could Be a Fire Hazard
 
  #3  
Old 01-15-13, 07:38 PM
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Short answer is as many that will fit. However, when you get to the cables bundled more that 24", and there is more than 3 current carrying conductors, you have to start derateing the conductors. Good news is that if there is no more than 9 current carrying conductors, and it is all NM-b you don't have to worry because the adjustment factor is only 70%.

#12 = 30 amps @ 70% = 21amps
#14 = 25 amps @ 70% = 17.5 amps

I would also agree with PJmax as they are not tightly bundled. Your inspector would have the final say though.
 
  #4  
Old 01-15-13, 07:50 PM
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Thanks guys I really appreciate the fast response.
 
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