Pull Can Conductor Fill

K

Kenkamba

Member
Location
Culver City
Occupation
Electrical Contractor
Can someone help me with the amount of #12 thhn conductors that are allowed in a 12"x12"x6" pull can. I am looking for the calculation formula. I'm assuming it is different from a standard 4"x4"x2-1/2" calculation.
 
What's a pull can is that another name for a pull box? If so the pull box fill would be 2.25 cu inches per #12 conductor.

12*12*6=864 cu in/2.25~384 #12 conductors permitted in the pull box. Might be a few less using the inside dimensions of the box.
 
Wow didn't think it would be that easy. I was considering adjustment factors and/or deducting 20% like you need to do for a gutter or wireway.
 
Yes, I know. I wasn't sure if I had to apply the same formula that is used in this video for #12's CCC.

But it sounds like I dont, right?
 
Know you want to be competitive when bidding jobs but I preferred to go up in size. If a 18 by 18 by 4" box would be large enough would go with a 24 by 24 by 4" box for possible future expansion.
 
Understood. Was just confirming when it comes to sizing a pull can/ pull box use W x H x D to determine Cu in then divide that by the largest CCC which in this case is 2.25 for #12's.

The video formula is different for a gutter/wireway. Wasn't sure if a pull box is considered a gutter or wire way.
 
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