What is the most critical requirement when selecting wiring for fire alarm systems?

When selecting wiring for fire alarm systems, the most critical requirement is the insulation rating. This is crucial because the insulation material must withstand high temperatures and potential exposure to fire without breaking down. In the event of a fire, the insulation needs to maintain its integrity to ensure that the fire alarm system functions properly and reliably communicates alerts. The kinds of insulation used in fire alarm systems are designed to limit the propagation of flames and resist moisture and other environmental factors, ensuring that the wiring does not become a hazard itself.

Other factors, such as wire gauge size, color coding, and conduit type, are important in their own right but do not hold the same critical significance as the insulation rating in the context of fire safety. The insulation directly affects the safety and effectiveness of a fire alarm system during a fire, making it the top priority when selecting wiring.