What material must NPFLA circuit conductors be made from?

The requirements for Non-Power Limited Fire Alarm (NPFLA) circuit conductors are clearly specified in the NFPA 72 code. The specific stipulation is that these conductors must be made from either solid or stranded copper. Copper is preferred for its electrical conductivity, corrosion resistance, and high reliability in fire alarm systems, ensuring that the circuits provide consistent and reliable performance. The specifications regarding conductor materials are in place to enhance the efficiency of fire alarm systems and to meet safety standards.

Thus, selecting solid or stranded copper as the only acceptable materials aligns with the objectives of NFPA 72 to ensure the integrity and performance of fire alarm signaling systems in critical safety environments.