ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
"Esoteric" countries and their wiring practices?
by winston_1. 04/23/19 02:34 PM
Norwegian power?
by Texas_Ranger. 04/20/19 06:27 PM
Welded Copper Connections
by gfretwell. 04/19/19 04:46 PM
Israel
by annemarie1. 04/18/19 02:35 PM
Water heater calculationsSo when I count calculati
by watersparkfalls. 04/13/19 12:43 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 5 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Re: end of line #415
01/17/01 09:39 PM
01/17/01 09:39 PM
D
don  Offline OP
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

Work Gear for Electricians and the Trades
Re: Re: end of line #416
01/17/01 11:41 PM
01/17/01 11:41 PM
G
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.

Re: Re: end of line #417
01/18/01 02:49 AM
01/18/01 02:49 AM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,905
NY, USA
Dave,

That sounds like a good explaination to me.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Scott35
Scott35
Anaheim, CA. USA
Posts: 2,720
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
254,566 Are you busy
190,791 Re: Forum
180,518 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.024s Queries: 14 (0.007s) Memory: 0.9504 MB (Peak: 1.0758 MB) Zlib enabled. Server Time: 2019-04-25 06:04:30 UTC