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 PLFA notification circuit is loaded to 0.95 of the listed power-supply output with no spare. Why is that poor applied design even if the circuit works at acceptance?

NFPA 72-2010 forbids any load above 50 percent There is no margin for added appliances, battery aging, temperature, or voltage drop, so the circuit may fall below listed appliance voltage later PLFA circuits must always be loaded to 150 percent The circuit automatically becomes NPLFA at 95 percent load

Correct Answer:

There is no margin for added appliances, battery aging, temperature, or voltage drop, so the circuit may fall below listed appliance voltage later

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