Electrician Red Seal · Question
An outlet box contains two #14/2 NMD-90 cables and one duplex receptacle. What is the minimum box volume required in millilitres (mL)?
Per CEC Rule 12-3034 and Table 23: two #14 AWG conductors from each cable (4 total) count as 4 x 24.6 mL = 98.4 mL. Both ground wires count as one largest condu
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Question: An outlet box contains two #14/2 NMD-90 cables and one duplex receptacle. What is the minimum box volume required in millilitres (mL)?
Answer options:
- 180 mL
- 213 mL ✅ 246 mL
- 295 mL
Correct answer: 246 mL
Explanation: Per CEC Rule 12-3034 and Table 23: two #14 AWG conductors from each cable (4 total) count as 4 x 24.6 mL = 98.4 mL. Both ground wires count as one largest conductor (1 x 24.6 mL). The duplex receptacle counts as two #14 AWG conductors (2 x 24.6 mL = 49.2 mL). Total = 98.4 + 24.6 + 49.2 + 49.2 (cable clamps) = 221.4 mL. A device box of 246 mL is the next standard size up.
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