Electrician Red Seal · Question
An electrician is selecting conductors for a 50 hp, 575 V, 3-phase squirrel cage induction motor with a Code F design. According to the Canadian Electrical Code (CEC) Rule 28-106, what is the minimum ampacity required for the branch circuit conductors before applying any correction or adjustment factors?
CEC Table 44 provides full load currents for motors. For a 50 hp, 575 V, 3-phase motor, the full load current is 52 A. According to Rule 28-106(1), the minimum
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Question: An electrician is selecting conductors for a 50 hp, 575 V, 3-phase squirrel cage induction motor with a Code F design. According to the Canadian Electrical Code (CEC) Rule 28-106, what is the minimum ampacity required for the branch circuit conductors before applying any correction or adjustment factors?
Answer options: ✅ 65 A
- 52 A
- 81 A
- 75 A
Correct answer: 65 A
Explanation: CEC Table 44 provides full load currents for motors. For a 50 hp, 575 V, 3-phase motor, the full load current is 52 A. According to Rule 28-106(1), the minimum conductor ampacity for a motor branch circuit is 125% of the motor's full load current. So, 52 A * 1.25 = 65 A.
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