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

NEC Requirements

Overview

Wiring Installation Methods

The wiring methods permitted by the NEC depend on the whether the fire alarm circuit is classified as "power-limited" or "non-power-limited." In simple terms, a non-power-limited circuit has the potential to have an unlimited amount of power on the circuit under fault conditions. By its design, a power-limited circuit strictly limits the amount of power on the circuit under fault conditions.

Thus, a power-limited circuit poses less of a shock and fire hazard than posed by a non-power-limited circuit.  However, this doesn't mean that the chances for severe personal injury are eliminated when using power-limited circuits. 

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

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