Core TradesQuestion 22 of 700
A device box contains four 12 AWG circuit conductors, two 12 AWG equipment grounding conductors, and one duplex receptacle. Using 2.25 cubic inches per 12 AWG conductor, what MINIMUM box volume is required?
a.About 13.5 cubic inches
b.About 15.75 cubic inches
c.About 18.0 cubic inches
d.About 20.25 cubic inches
Explanation
Count 4 for the circuit conductors, 1 for all grounding conductors combined, and 2 for the yoke (device) based on the largest conductor, giving 7 units x 2.25 = 15.75 cubic inches. Counting the grounds individually or the device as one raises or lowers the total incorrectly.
Law Reference: 2025 CA Electrical Code (CEC) §314.16 (Box Fill)Practice all 700 questions free — no signup required.
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