NM CID ES-1 Practice Questions - New Mexico CID ES-1 Electrical Signs And Outline Lighting Examination Exam

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NEC 600.23(B) requires secondary-circuit ground-fault protection on neon transformers and electronic power supplies except in which case?

Any transformer installed outdoors Transformers with isolated ungrounded secondaries and a maximum open-circuit voltage of 7500 volts or less, or transformers with an integral porcelain or glass secondary housing that need no field secondary wiring Any electronic power supply larger than 300 mA All midpoint-referenced 15,000-volt transformers

Correct Answer:

Transformers with isolated ungrounded secondaries and a maximum open-circuit voltage of 7500 volts or less, or transformers with an integral porcelain or glass secondary housing that need no field secondary wiring

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