NPLFA Circuit Power Source Requirements

The power source for a non-power-limited fire alarm circuit shall not operate at more than _____.

a) 120V
b) 300V
c) 600V
d) 20A

See answer and applicable Code reference

The correct answer is: c) 600V

Article 760 covers the installation of wiring and equipment of fire alarm systems including all circuits controlled and powered by the fire alarm system. Part II of this Article covers non-power-limited fire alarm circuits. As per 760.41(A), "The power source of non-power-limited fire alarm circuits shall comply with Chapters 1 through 4, and the output voltage shall be not more than 600V, nominal. The fire alarm circuit disconnect shall be permitted to be secured in the "on" position."


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