Wiring 4-way Light Switches

Reply

  #1  
Old 01-28-02, 03:42 PM
Visiting Guest
Posts: n/a
Question Wiring 4-way Light Switches

I'm troubleshooting and re-installing a 4-way light switch in an older home (circa 1920). It uses the old cloth-and-rubber wrapped 2-wire system in flexible steel BMX conduit, or in some places knob-and-tube.

Problem: One light fixture is controlled by switches from 3 different locations: (2) 3-way switches, and (1) 4-way switch. I've located the hot wires and the 2 travelers in both of the 3-way switch boxes. But, when using a continuity tester in the 4-way switch box, I get completed circuits from ANY two wires I touch!?! Also, one of the 3-way switches must always be in the "on" position for the other 2 switches to work.

Question: is there a simple fool-proof method for wiring and troubleshooting 4-way switches, similar to the one I use for installing 3-way switches (see below)?





3-way Light Switch Wiring Method

To install and troubleshoot for proper wiring between (2) 3-way switches (without a continual circuit or ground fault), I've always used the following method:

1. disconnect all 3 wires from both switches
2. with the circuit hot, use a light probe to find the hot wire (common) in one switch box; shut off power
3. attach the hot wire to the single screw (common terminal) for that switch
4. wrap the other two wires in that box (travelers) together
5. use a continuity tester to find a complete circuit among the 3 wires in the second switch box (they'll be the other ends of the travelers from the first box)
6. attach both sets of travelers to the 2 screws opposite each other on each switch
7. attach the remaining wire for the second switch (hot wire) to the single screw (common terminal) of that switch
 
Sponsored Links
  #2  
Old 01-28-02, 06:13 PM
Member
Join Date: Sep 2000
Location: United States
Posts: 18,497
Received 0 Votes on 0 Posts
Did you just ask and answer your own question? Do you still need help? I'm confused.
 
  #3  
Old 01-28-02, 07:16 PM
HandyRon's Avatar
Member
Join Date: Dec 2001
Location: New York
Posts: 1,365
Received 0 Votes on 0 Posts
Look at the diagram attached for the concept, then test away.
http://www.wfu.edu/~matthews/misc/sw...Animation.html
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: