What type of substitution is allowed for plenum cable?

In the context of NFPA 72 and cabling standards for fire alarm systems, the correct substitution for plenum cable is the Power Limited Fire Alarm Plenum (FPLP) CMP. The use of FPLP is specifically designed for fire alarm systems and is permitted in plenum spaces, which are areas used for air circulation in heating and air conditioning systems. These areas are subject to strict fire safety regulations because they can facilitate the rapid spread of smoke and flames.

FPLP CMP cables are constructed to be more fire-resistant than standard cables, mitigating the risk of fire spreading in the event of a fire within the plenum. This type of cable is also designed to handle the power limitations imposed by the National Electrical Code (NEC), thus ensuring compliance with the safety standards.

The necessity for using a cable that meets the appropriate fire resistance and performance criteria in plenum spaces is crucial for maintaining the safety and integrity of fire alarm signaling. Therefore, FPLP is deemed suitable as a substitute for standard plenum cables, ensuring that the fire alarm system operates effectively and aligns with the fire protection regulations outlined in NFPA standards.