ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
220/230/240V 60Hz Systems
by gfretwell. 09/23/18 02:50 PM
Inspection camera help
by petey_c. 09/22/18 07:52 AM
Motion detectors and dimmers
by gfretwell. 09/20/18 04:02 PM
Extension cords
by annemarie1. 09/20/18 08:54 AM
Acronis Backup 2017
by gfretwell. 09/16/18 12:46 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 7 guests, and 23 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
low voltage smoke alarms #62791
02/26/06 06:06 PM
02/26/06 06:06 PM
B
BigB  Offline OP
Member
Joined: Mar 2004
Posts: 732
Tucson, AZ USA
I was working in an adult care home last week when I had to remove a smoke alarm that was in my way. When I pulled it off the mount, I discovered it was wired to line voltage with 4 conductor telephone wire. Upon investigation I found the entire system was wired and interconnected with the same phone wire, plus no boxes, just flying splices tucked away in the walls behind each unit!
Before I submit a bid for rewiring the entire system, which would require a lot of cutting into walls (this is a residential structure) I thought there might be a low voltage interconnected system that I could use with the existing low voltage 4 conductor wire.
Anyone know of such a system?

Work Gear for Electricians and the Trades
Re: low voltage smoke alarms #62792
02/26/06 06:28 PM
02/26/06 06:28 PM
M
macmikeman  Offline
Member
Joined: Jul 2002
Posts: 717
Honolulu, Hawaii
Whatever hack installed this one in the first place probably took a lot of other shortcuts as well. Hidden ones. Before you take on the liability of assuming his wiring is good for a low voltage system, think it through. I would bid this to run new wiring. Then you know it is well done and will work when it needs to.

Re: low voltage smoke alarms #62793
02/26/06 08:19 PM
02/26/06 08:19 PM
D
DSpanoudakis  Offline
Member
Joined: Aug 2005
Posts: 89
Astoria, Queens, N.Y.C.
I'm currently doing a fire alarm job at a children's psychiatric center. All of our smoke detectors and duct detectors are low voltage where we either use 1-pair 16ga. shielded cable or a 2-pair 16ga. shielded cable, depending on what circuit we're working on. But yes, everything we do is on 24v. The only thing we have done on 120v, in this fire alarm install, is for a couple of duct damper switches. Other than that, low-voltage.


Featured:

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

 

Member Spotlight
dougwells
dougwells
kamloops BC Canada
Posts: 1,149
Joined: May 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 13
Trumpy 11
Popular Topics(Views)
249,406 Are you busy
187,336 Re: Forum
176,674 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.015s Queries: 14 (0.004s) Memory: 0.9513 MB (Peak: 1.0736 MB) Zlib enabled. Server Time: 2018-09-23 22:04:19 UTC