ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Photocell
by Docholiday. 01/22/18 10:52 AM
AreMetal Ladders Ever OK For Electrical Work?
by gfretwell. 01/22/18 01:15 AM
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 22 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Fire Alarm System #68978
08/23/06 12:49 AM
08/23/06 12:49 AM
C
Cinner  Offline OP
Member
Joined: Dec 2004
Posts: 78
Kelowna, B.C., Canada
Has anyone encountered a very old fire alarm system that has a seperate 2 wire circuit with an EOL at each device? I am working on an existing fire alarm system that runs 2 wires in(red and black) and 2 wires out to next pull station or to the end of line resistor...but it also has a second circuit ( 2 blue wires) to each pull station with a different eol resistor at each pull station.

Does anyone know what the 2 blue wire circuit is and why there is a EOL at each device?




[This message has been edited by Cinner (edited 08-23-2006).]

Work Gear for Electricians and the Trades
Re: Fire Alarm System #68979
08/23/06 10:59 AM
08/23/06 10:59 AM
M
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
Is it a 2 stage Fire Alarm? Are there key switches at the pull stations in addition to the regular switch?

Maybe some auxilliary control for FA initiation by Pull station like a door holder or lock?

Secure the control cabinet and bell circuits. arrange a time to pull a breakglass and see what happens.

Re: Fire Alarm System #68980
08/23/06 05:22 PM
08/23/06 05:22 PM
togol  Offline
Member
Joined: Sep 2005
Posts: 421
NW In. USA
it may be a supervisory circuit, but I am not certain...might be used to pinpoint which station is in alarm alarm


Tom
Re: Fire Alarm System #68981
08/25/06 06:08 PM
08/25/06 06:08 PM
D
deverson  Offline
Member
Joined: Mar 2005
Posts: 20
Mosinee, WI USA
The blue wires are probably for the glass break feature. If you break the glass rod you get a trouble. I haven't seen one in a few years but used to deal with them weekly.
Dave


Featured:

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

 

Member Spotlight
CDS
CDS
Nicholson Ga
Posts: 34
Joined: June 2006
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
Potseal 15
sparky 15
Popular Topics(Views)
243,595 Are you busy
180,392 Re: Forum
170,862 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.017s Queries: 14 (0.004s) Memory: 0.9586 MB (Peak: 1.0881 MB) Zlib enabled. Server Time: 2018-01-22 17:54:36 UTC