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#415 - 01/17/01 09:39 PM Re: end of line  
don  Offline
Junior Member
Joined: Jan 2001
Posts: 2
Ontario
Guys I guess what my question is. What is the purpose of the end of the line resistor in a fire system


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#416 - 01/17/01 11:41 PM Re: Re: end of line  
gto6t7  Offline
Member
Joined: Dec 2000
Posts: 27
Machias, ME
Don,
On a two wire zone the devices, pull stations, heat heads or smoke detectors short out the wires and call in an alarm but if a wire breakes off none of the devices downstream from the break will work.The solution is that the system is designed to supervise or monitor the wires and if there is a break in the wire it sounds a trouble. The way it works is the end of the line resistor connects the two wires at the very end allowing a lowered voltage to constantly flow through the loop. This voltage is not enough to triger an alarm but it is detected by the system and asures that the wires are OK. To triger an alarm the device will short the two wires togeather and the loop passes full voltage back thus an alarm. Hope this makes sense.

Dave T.


#417 - 01/18/01 02:49 AM Re: Re: end of line  
Bill Addiss  Offline
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Joined: Oct 2000
Posts: 3,878
NY, USA
Dave,

That sounds like a good explaination to me.



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