Texas Fire Alarm License Practice Test

Which sizes of conductors are permitted in N.P.L.F.A systems?

1. Size 14 A.W.G and 12 A.W.G

2. Size 20 A.W.G and 22 A.W.G

3. Size 18 A.W.G and 16 A.W.G

4. Size 24 A.W.G only

The correct answer is: Size 18 A.W.G and 16 A.W.G

In non-power-limited fire alarm (N.P.L.F.A) systems, the use of conductors is governed by specific standards that ensure safety and reliability in fire alarm applications. The correct sizes of conductors permitted in these systems are 18 A.W.G and 16 A.W.G. These conductor sizes are ideal because they provide an appropriate balance between resistance, current-carrying capacity, and mechanical strength, which are essential for the effective transmission of signals in fire alarm systems. Using these sizes helps to minimize the risk of voltage drop and ensures that the system can operate effectively over the required distances while maintaining the integrity of the signaling for alarms. Other options presented do not align with the recognized standards for N.P.L.F.A systems based on their specified sizes, which may either be too small to effectively handle the demands of fire alarm signaling or may be unsuitable for the environmental and safety requirements of a fire alarm system.