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

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A listed fire-alarm control unit is plugged into an unlisted office UPS that was sized only for a desktop computer. Why does that arrangement fail NFPA 72-2010 secondary-power rules?

NFPA 72-2010 forbids any use of a UPS Secondary power must be a dedicated, supervised supply capable of the required standby plus alarm duration; an unlisted computer UPS is not that supply The UPS converts the initiating-device circuits from Class B to Class A Office UPS units operate at more than 50 volts, which is outside ES-3 scope

Correct Answer:

Secondary power must be a dedicated, supervised supply capable of the required standby plus alarm duration; an unlisted computer UPS is not that supply

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