NM CID ES-3 Practice Questions - New Mexico CID ES-3 Low Voltage Special Systems (Under 50 Volts) Examination Exam

Which statement correctly distinguishes AC from DC as used on ES-3 systems?

DC periodically reverses polarity; AC is unidirectional AC periodically reverses polarity; DC is unidirectional Both AC and DC reverse polarity 60 times per second in the United States Class 2 circuits are prohibited from using DC

Correct Answer:

AC periodically reverses polarity; DC is unidirectional

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