Electrician Red Seal · Question
A Red Seal electrician is commissioned to install a new electric vehicle (EV) charging station in a detached garage. The charging station is rated at 40 A. What is the MINIMUM size, in AWG, of copper conductors required for this dedicated circuit, assuming an NMD90 cable and no other derating factors?
Rule 8-106(1) and 8-108(1) require a continuous load to be multiplied by 125%. So, 40 A * 125% = 50 A. According to Table 2 of the CEC, 6 AWG NMD90 copper condu
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Question: A Red Seal electrician is commissioned to install a new electric vehicle (EV) charging station in a detached garage. The charging station is rated at 40 A. What is the MINIMUM size, in AWG, of copper conductors required for this dedicated circuit, assuming an NMD90 cable and no other derating factors?
Answer options:
- 10 AWG
- 8 AWG ✅ 6 AWG
- 4 AWG
Correct answer: 6 AWG
Explanation: Rule 8-106(1) and 8-108(1) require a continuous load to be multiplied by 125%. So, 40 A * 125% = 50 A. According to Table 2 of the CEC, 6 AWG NMD90 copper conductors are rated for 60 A at 90°C, which is sufficient for a 50 A continuous load. Therefore, 6 AWG is the minimum for the circuit.
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