Electrician Red Seal · Question
An electrician is installing a single-phase, 240 V air conditioner unit on the roof of a commercial building. The unit has a nameplate rating of 35 A continuous load and a minimum circuit ampacity (MCA) of 44 A. What is the minimum size of overcurrent protection required for this unit, according to the CEC?
Rule 28-200 and related sections for motors and air conditioning equipment often specify that the overcurrent protection shall not exceed the manufacturer's spe
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Question: An electrician is installing a single-phase, 240 V air conditioner unit on the roof of a commercial building. The unit has a nameplate rating of 35 A continuous load and a minimum circuit ampacity (MCA) of 44 A. What is the minimum size of overcurrent protection required for this unit, according to the CEC?
Answer options:
- 30 A
- 40 A ✅ 50 A
- 60 A
Correct answer: 50 A
Explanation: Rule 28-200 and related sections for motors and air conditioning equipment often specify that the overcurrent protection shall not exceed the manufacturer's specified MCA. Given an MCA of 44 A, the next standard size of overcurrent device above this would be 50 A.
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