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Red Seal Construction Electrician

Category - Construction Electrician

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The calculated load of a service feeder has been calculated at 125 A and will be wired with a #1 AWG copper conductor at 75 degrees termination temperature. What is the maximum rating of overcurrent device permitted?

100 A
125 A
150 A
200 A

Explanation

Answer: C. Explanation: Table 2 states that the ampacity of #1 AWG copper is 130 A and Table 13 lists 150 A as acceptable overcurrent protection for wire of that ampacity. A 125 A overcurrent device would be permitted as it is less than the ampacity of the wire, but it is not the maximum permitted overcurrent device.

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