Fire Alarm End Of Line Resistor Value

This is because fire sensors are normally open devices.

Fire alarm end of line resistor value. The resistor would actually be at the end of the line and supervision would be accomplished. Comfort s end of line resistor values are 2 7k ohms in series with the contact and 4 7 k ohms in parallel with the contact. Fire before getting into the importance of the end of line resistor though we have to understand the importance of having a fire alarm system in the first place. There are no standards for eolr values.

First fire zones always use resistors even if the other zones do not. To allow the panel s internal ohmmeter to check the continuity of the wires supervise the wires the end of line resistor is at the end of the loop. Driveway entry alert alarms. Each manufacturer of protective systems e g.

A fire alarm system fas detects fire and warns people of the fire. The end of line resistor used in fire alarm systems and security systems may look the same as a terminating resistor however the function of the end of line resistor is completely different. The resistor would actually be at the end of the line and supervision would be accomplished. For example fire alarm systems use the eol resistor at the last device hooked up in parallel on each line.

In this video we talk about using resistors in securrity alarm panels. Are there any other ways in which resistors are used. Determine the eol for your system. You ll have actually two different values of resistor.

So just like with the single end of line resistor you ll have a resistor in series with the sensor but then you ll also have a resistor in parallel at the sensor. Alarm parts accessories. It s important to understand that the signals used in fire alarm systems are dc either on or off not ac which carries information like video or. Fire alarm system specifies their own value.

They only close the circuit when they trip. And for different types of input card in a system the value may be different. What value of eol resistor should i use. So one value of resistor wired in series.

The 2 7k ohms value can be substituted with 2 2 kohms without any problem. Some lines end at the panel which means the resistor should be installed within the panel and some end at the last device wired in a parallel connection. Why it is important to place them at the eol or end of line. The eol allows the.