Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the sizes and numbers of raceways.
Boxes enclosing conductors for 4 AWG or larger (under 600V) must be installed with the requirements. When determining the minimum size box for conductors, the sizes and numbers of conductors are needed to calculate the minimum size box.
Calculations are different for pull and junction boxes. Boxes containing conductors of 4 AWG or larger, under 600V, are calculated from the sizes and numbers of raceways.
Boxes containing straight pulls are sized according to the largest single raceway entering the box. One calculation is only needed for boxes having raceways.
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