All questions and answers are based on the 2014 NEC.
Q. What are the NEC requirements for sizing boxes for conductor fill?
A. Boxes containing 6 AWG and smaller conductors must be sized in an approved manner to provide free space for all conductors, devices, and fittings. In no case can the volume of the box, as calculated in Sec. 314.16(A), be less than the volume requirement as calculated in Sec. 314.16(B) [314.16]. Condui