Junction box sizing

[AndrewGia93]

If you oversize a pipe going into a junction box do you still size that box to “the biggest raceway”

 

[infinity]

What size are the conductors?

 

[AndrewGia93]

8 - 500 mcm aluminum and 8 - 250 mcm aluminum

 

[LarryFine]

If you oversize a pipe going into a junction box do you still size that box to “the biggest raceway”

Yes, because the wires could be replaced with larger wires in the future.

 

[infinity]

Once the conductors are #4 or larger the box is sized according to the size of the raceways so the number and size of the conductors is no longer relevant.