Tub Size

[ALLELECTRIC95]

Could anyone please direct me to the section in the code that addresses the size of tub required in relation to wire fill? I looked at a project where the panel had too much wire fill and I want to direct my customer to the section of the NEC that explains this requirement for air circulation.

Thanks!

 

[Buck Parrish]

08 NEC 376.56 (a)

 

[infinity]

If your referring to the back box of a panelboard it's 312.8. Article 376 would be for a wireway.

 

[Buck Parrish]

Okay agreed, I read "power distribution block."

So the answer is no more then 40% or 75% 312.8 is not real clear.