NEC 2026 Compatible
A power-limited fire alarm (PLFA) circuit is installed in a building. What is the maximum allowable voltage between any two conductors of the PLFA circuit, if the power source is listed as a Class 2 power supply, and the circuit is not exposed to accidental contact with electric light or power conductors?
Journeyman Level📋 NEC 760.121(A), Table 760.121(A)Fire Alarm Systems - Power-Limited Circuits
A
30 Volts peak
B
60 Volts DC
C
100 Volts AC RMS
D
150 Volts AC RMS
Explanation & Direct Citation
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