Texas Fire Alarm License Practice Test

What is the maximum voltage allowed through multi-conductor N.P.F.L.A cables?

1. 100 volts

2. 150 volts

3. 300 volts

4. 500 volts

The correct answer is: 150 volts

The maximum voltage allowed through multi-conductor Non-Power Limited Fire Alarm (N.P.F.L.A) cables is 150 volts. This voltage limitation is set primarily to ensure safety and compatibility with fire alarm systems, which are designed to operate at lower voltage levels to reduce the risk of electrical hazards during a fire event. Fire alarm circuits are sensitive, and operating them at voltages above 150 volts could pose risks not only to the integrity of the fire alarm system but also to the safety of personnel and building occupants. Fire alarm systems are typically engineered to function effectively within a specific voltage range, and adherence to this standard is crucial for their reliability and safety. When examining the other potential voltage levels, none align with the standards established for N.P.F.L.A cables. Each higher voltage rating poses an increased risk and is therefore not permissible for these types of cables in fire alarm applications. By sticking to the 150-volt limit, compliance with safety codes and regulations is maintained, ensuring optimal performance of fire alarm systems in emergency situations.