What is the maximum allowed amperage for overcurrent protection on 18 AWG conductors in fire alarm systems?

In fire alarm systems, the maximum allowed amperage for overcurrent protection on 18 AWG conductors is 7 amperes. This standard is based on the National Electrical Code (NEC) guidelines, which ensure the safe operation of low-voltage wiring, particularly in critical applications like fire alarms where safeguarding the system's integrity is essential.

Using an overcurrent protection device rated at more than 7 amperes could lead to overheating of the 18 AWG conductors, resulting in potential damage or failure of the wiring. It is important to adhere to this limit to maintain both the operational reliability of the fire alarm system and compliance with electrical safety codes. Understanding these limits helps ensure that installations are safe and effective in protecting life and property.