Equipment & SystemsQuestion 331 of 521
A power-limited fire alarm (PLFA) power source is limited to what maximum output?
a.50 VA
b.100 VA
c.250 VA
d.1000 VA
Explanation
Section 760.121 limits a PLFA power source to the output of a listed Class 3 supply not exceeding 100 volt-amperes. Sources exceeding these limits are treated as non-power-limited fire alarm (NPLFA) circuits and must follow Chapter 3 wiring methods.
Law Reference: 2023 NEC §760.121Practice all 521 questions free — no signup required.
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