Box size and depth (bend radius) question:

[caymansparky]

I have two rows of conduit coming into the top of the box. Each row has 17 - 2? GRC and 1 ? 3? GRC. The box width is set at 50 inches due to chase size.

The same number and configuration of conduits (in EMT) will be leaving the back of the box.

(3) #1/0 awg /w/ (1) #6 will be in each 2? conduit and (4) 250 kcmil /w/ (1) #4 awg will be in each 3? conduit.


I come up with 55? (minimum) length and 8? minimum depth.

 

[Smart $]

I have two rows of conduit coming into the top of the box. Each row has 17 - 2? GRC and 1 ? 3? GRC. The box width is set at 50 inches due to chase size.

The same number and configuration of conduits (in EMT) will be leaving the back of the box.

(3) #1/0 awg /w/ (1) #6 will be in each 2? conduit and (4) 250 kcmil /w/ (1) #4 awg will be in each 3? conduit.


I come up with 55? (minimum) length and 8? minimum depth.

Assuming the back of the box is the wall opposite a removable cover, the top to bottom measure must equal or exceed:

3" ? 6 + (17 ? 2") =52"

Minimum depth is per Table 312.6(A) for largest wire (250kcmil), one wire per terminal... and that is 4.5".