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NOTE: This is an unformatted excerpt from our online fire protection training library.

NEC Requirements

Summary

Summary

For circuits operating at 150 volts or less, non-power-limited cables are available which, with certain restrictions, may be installed exposed.
A power-limited fire alarm circuit is one that is powered by a source that is inherently limited in the amount of current that can be on the circuit, even under fault conditions. For DC circuits operating at 20 to 100 volts, the limit is 100 volt-amperes.
Power-limited circuits must be marked so that personnel working on the system know they are working on power-limited circuits. If circuits are not so marked, the assumption that the circuits are non-power-limited is applicable.
In general, power-limited circuits may be installed using the installation methods in NEC Chapter 3, non-power-limited cables, or power-limited cables.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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