In a setup with a 7200 to 4160 V three-phase transformer, 150 kVA, in a supervised location, the feeder tap is protected with a three-phase circuit breaker in an enclosure. The transformer has 7% impedance and powers a three-phase fused safety switch. According to NEC 450.3, the fuses in the switch may be no larger than ___ amps.

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Prepare for the Independent Electrical Contractors (IEC) Year 4 Exam. Access flashcards, multiple choice questions, and detailed explanations. Enhance your readiness and achieve your certification!

Multiple Choice

In a setup with a 7200 to 4160 V three-phase transformer, 150 kVA, in a supervised location, the feeder tap is protected with a three-phase circuit breaker in an enclosure. The transformer has 7% impedance and powers a three-phase fused safety switch. According to NEC 450.3, the fuses in the switch may be no larger than ___ amps.

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