NEC 430 and 312.6

[Dale001289]

I have a 460V motor termination box that appears to be vastly undersized for the conductors entering the box. Where do I find the calc in NEC that determines what size is needed? Is this a 312.6 calculation?

 

[infinity]

Nothing in Article 312 or 314 would apply. Look at 430.12.

314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies. Boxes and conduit bodies shall be of an approved size to provide free space for all enclosed conductors. In no case shall the volume of the box, as calculated in 314.16(A), be less than the fill calculation as calculated in 314.16(B). The minimum volume for conduit bodies shall be as calculated in 314.16(C). The provisions of this section shall not apply to terminal housings supplied with motors or generators.
Informational Note: For volume requirements of motor or generator terminal housings, see 430.12.

 

[Dale001289]

Thank you infinity.