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how to calculate volume of electrical box. Box Fill Small Boxes. A 4-inch square box that is 112 inches deep has a volume of 210 cubic inches.
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- To determine the volume of the wire and devices going into the box you must apply the FIVE RULES in 31416B1-5 and the volume allowances in Table 31416B Volume Allowance Required per Conductor. Determine the number of each size conductor. After checking the total volume of your box use this chart to determine the number of wires allowed based on the wire size youre using.
- The available volume for a box is from Table 31416A Metal Boxes or the box is stamped with the maximum volume.
14Ga so 2 cubic inches per count. To calculate the volume of a box or rectangular tank you need three dimensions. Use the NEC code to determine the correct size box ne. One stud for mounting a lighting fixture One volume allowance based on largest conductor 225 cuin.
