Electrician Red Seal · Question
An electrician is installing a new 240 V circuit for an electric vehicle charging station in a detached garage. The service to the detached garage is a 60 A, 120/240 V feeder. The charging station requires a continuous load of 32 A. What is the minimum allowable size for the copper conductors, assuming NMD90 cable and ambient temperature of 30°C?
For a continuous load of 32 A, the overcurrent device must be sized at 125% of the continuous load: 32 A * 1.25 = 40 A. Consulting Table 2 and Table 4 of the CE
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Question: An electrician is installing a new 240 V circuit for an electric vehicle charging station in a detached garage. The service to the detached garage is a 60 A, 120/240 V feeder. The charging station requires a continuous load of 32 A. What is the minimum allowable size for the copper conductors, assuming NMD90 cable and ambient temperature of 30°C?
Answer options: ✅ 8 AWG
- 10 AWG
- 6 AWG
- 12 AWG
Correct answer: 8 AWG
Explanation: For a continuous load of 32 A, the overcurrent device must be sized at 125% of the continuous load: 32 A * 1.25 = 40 A. Consulting Table 2 and Table 4 of the CEC, a 40 A breaker requires a minimum of 8 AWG copper wire (NMD90, 90°C column) to safely carry the current. 10 AWG is only rated for 35 A.
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