ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
AFDD's coming to the UK
by Texas_Ranger. 02/18/19 02:04 PM
by Texas_Ranger. 02/18/19 02:01 PM
by gfretwell. 02/16/19 01:08 PM
PurpleAir Recalls Power Supply Units
by Admin. 02/14/19 08:43 PM
Utility Company Programs
by katty81. 02/14/19 11:11 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 2 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
low voltage switching #62607
02/20/06 09:10 PM
02/20/06 09:10 PM
luckyshadow  Offline OP
Joined: Jan 2005
Posts: 315
Maryland USA
I am going to look at a persons house that was built in the 70's. It has low voltage light switching. From what I am told the relays are located in the attic. It seems that some relays will " stick" in the summer when the attic is very hot.( It's not the same relays every time either)There is never a problem during the winter /fall/spring. The homeowner doesn't want to rewire the switches either. Another Electrician suggested that I try and make sure the relays are located together and maybe install a stat controlled fan to blow across them to try and cool them. Maybe try locating them close to the gable vent with a fan blowing inward and another on the other end blowing out; cooling the attic at the same time. Have any of you ever dealt with this type of system? Any ideas / suggestions are welcome

Work Gear for Electricians and the Trades
Re: low voltage switching #62608
02/20/06 09:37 PM
02/20/06 09:37 PM
JoeTestingEngr  Offline
Joined: Nov 2005
Posts: 800
Chicago, Il.
I helped my brother build his home with a low voltage lighting panel using GE 24V RR7 relays. This panel is located in a basement so it doesn't go through high temperature excursions. I might look into installing a peltier effect module if I ran into the situation you describe. I say this because I could use the module to reduce the inner panel temp below ambient in the summer, then warm it above ambient in the winter. The modules are becoming quite popular in coolers these days. It would be a simple matter to come up with a control scheme with upper and lower limits.

Re: low voltage switching #62609
02/20/06 10:47 PM
02/20/06 10:47 PM
Radar  Offline
Joined: Apr 2004
Posts: 349
Los Angeles, CA
There's some relatively older neighborhoods around the LA area that were built in the 40's that use low voltage switching. Years ago I did a couple of service calls on these. These were somewhat unusual in that the relays were not located together but were distributed throughout the house. For instance, a switched light outlet would have the relay stuck in a KO in the outlet box - HV wires inside the box and LV wires out in the attic space.

I did not run into the situation you described (sticky relays)but I did replace a few burned out relays and defective switches. There was an Ace Hardware store in the neighborhood that stocked relays and switches and sold them to all the neighbors for outrageous prices.

If you discover all the relays in a common location, there is some benefit to that. As I understand it, the downside to that is being able to hear the relays all operate at the same location (i.e. if the relay panel is located right above the living room). However, it sure would be easier to work on.

Good luck, and please report back your findings.


There are 10 types of people. Those who know binary, and those who don't.
Re: low voltage switching #62610
02/20/06 10:59 PM
02/20/06 10:59 PM
Lostazhell  Offline
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
Maybe give these guys an email...


They made most of the systems I've run into around LA and San Diego... Although some of the older ones were made by Bryant, GE, or Sierra.

Re: low voltage switching #62611
02/21/06 12:07 AM
02/21/06 12:07 AM
livetoride  Offline
Joined: Jan 2005
Posts: 109
san diego ca usa
Check for sticking switches. If they have pilot lights I have seen the small xformers for the pilot lights short and cause sticking. Most of the time there is a master switch panel, individual switches that will operate all the switches (most of the time the master BR). Happy hunting. Rod


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


Member Spotlight
lil suzi
lil suzi
Posts: 57
Joined: August 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
Popular Topics(Views)
253,249 Are you busy
189,889 Re: Forum
179,598 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.025s Queries: 14 (0.006s) Memory: 0.9691 MB (Peak: 1.1066 MB) Zlib enabled. Server Time: 2019-02-19 10:59:36 UTC