Electrician Red Seal · Question
What is the maximum overcurrent protection permitted for a circuit supplying a fixed electric space heater with no motor, where the heater is rated 40 A?
As per CEC Rule 62-114(5), if the overcurrent device also serves as the disconnecting means, it can be rated up to 125% of the heater's load. However, per 62-11
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Question: What is the maximum overcurrent protection permitted for a circuit supplying a fixed electric space heater with no motor, where the heater is rated 40 A?
Answer options:
- 40 A
- 45 A ✅ 50 A
- 60 A
Correct answer: 50 A
Explanation: As per CEC Rule 62-114(5), if the overcurrent device also serves as the disconnecting means, it can be rated up to 125% of the heater's load. However, per 62-114(7), the branch circuit overcurrent can be sized up to the next standard rating if the load is 125% of the rating. For a 40A heater, the branch circuit must have an ampacity of 125% (50A). Therefore, a 50A breaker is permitted for the branch circuit.
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