Electrician Red Seal · Question
During the inspection of a new residential service installation, an electrical inspector notices that the main service disconnect is rated for 125 A, but the utility's overhead service conductors are rated for 150 A. The meter base is rated for 200 A. Is this installation compliant with the Canadian Electrical Code (CEC)?
Rule 8-106(1) of the CEC permits the rating of the service box or service disconnecting means to be not less than the calculated demand load, even if the servic
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Question: During the inspection of a new residential service installation, an electrical inspector notices that the main service disconnect is rated for 125 A, but the utility's overhead service conductors are rated for 150 A. The meter base is rated for 200 A. Is this installation compliant with the Canadian Electrical Code (CEC)?
Answer options: ✅ Yes, the service disconnect rating can be less than the utility conductors.
- No, the service disconnect must be rated for at least 150 A.
- Yes, as long as the meter base is rated higher than the disconnect.
- No, the service disconnect rating must match the meter base rating.
Correct answer: Yes, the service disconnect rating can be less than the utility conductors.
Explanation: Rule 8-106(1) of the CEC permits the rating of the service box or service disconnecting means to be not less than the calculated demand load, even if the service conductors or utility supply has a higher ampacity. It does not require a match to the utility conductor or meter base rating.
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