The volume calculations of two 14/2 MC cables can yield what approximate cubic inches of space used in a box?

To determine the approximate cubic inches of space used in a box by two 14/2 MC (Metal Clad) cables, it's important to understand the volume allowances as specified by the National Electrical Code (NEC). Each 14/2 MC cable consists of two conductors and a ground wire, which contributes to the total volume that the cables occupy in an electrical box.

The NEC provides specific guidelines for calculating the cubic inch capacity of boxes based on the number of conductors and other components inserted into a box. Typically, for a 14-gauge conductor, the NEC recommends a volume allowance of approximately 2.25 cubic inches per wire. Therefore, for two 14/2 MC cables (which would be equivalent to 4 conductors plus a ground), the calculation would be as follows:

• Each 14/2 cable contributes 2.25 cubic inches for each of the two conductors.

• Thus, for two cables, the total volume used would be 4 conductors x 2.25 cubic inches = 9 cubic inches.

• However, it is necessary to also add the volume for the grounding conductors and other components (like the jacket of the cable), which can vary based on local codes and interpretations