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Volume of a Cube

Not too many boxes used by electricians are cubes. That is, a box where the length of each side is the same. But the calculation to find the volume of a cube is basic. It is no more than the value of one side times the value of another side times the value of the last side. So if a cube box had sides of eight inches, the volume would be 8 inches X 8 inches X 8 inches or 512 cubic inches.

Cubic inches are needed to determine box sizing for conductors smaller than 4. So any time a box is selected to contain conductors size #6 AWG and smaller, a cubic inch calculation may be necessary.


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