Fire Alarm Question

[bfreecjc]

What is the difference between Non-power-Limited Fire Alarm circuits and Power-Limited Fire Alarm Circuits? I am reading Article 760 and the definitions make no sence to me?

 

[Dennis Alwon]

What is the difference between Non-power-Limited Fire Alarm circuits and Power-Limited Fire Alarm Circuits? I am reading Article 760 and the definitions make no sence to me?

The way I read it is that a non-power limited fire alarm uses line voltage and the power-limited uses a class 3 trany for power-- I presume 24 volts or so.

 

[Kevink]

The way I read it is that a non-power limited fire alarm uses line voltage and the power-limited uses a class 3 trany for power-- I presume 24 volts or so.

This site should explain what you are looking for "power-limited/nonpower-limited"
http://www.ul.com/regulators/ode/0600.pdf


Kev

 

[peter d]

The major difference is that power limited fire alarms are found virtually everywhere, and non-power limited fire alarms are obsolete for all intents and purposes.