The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
Trumpy 8
sparkyinak 7
Who's Online
0 registered (), 81 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#415 - 01/17/01 05:39 PM Re: end of line
don Offline
Junior Member

Registered: 01/16/01
Posts: 2
Loc: Ontario
Guys I guess what my question is. What is the purpose of the end of the line resistor in a fire system

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#416 - 01/17/01 07:41 PM Re: Re: end of line
gto6t7 Offline
Member

Registered: 12/16/00
Posts: 30
Loc: 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.

Top
#417 - 01/17/01 10:49 PM Re: Re: end of line
Bill Addiss Offline
Member

Registered: 10/07/00
Posts: 4196
Loc: NY, USA
Dave,

That sounds like a good explaination to me.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals