Wiring in a new switch unit

[AnonymousImport]

In my hallway there are 3 switches to control one light, two I have replaced however the third is causing a problem. The old switch has 4 connectors at the rear L1, L2 at the top and L1, L2 at the bottom. The new switch has L1, L2 at the bottom and Common at the top. The shop assure me it can be done. All tips gratefully accepted
Thanks

 

[amtodd]

Usually a three way lighting circuit is the same as a two way circuit with a change over (intermediate) switch in the middle.

2 way>>
Live from rose (or J-box) to first switch common and out on either L1 or L2.
Last switch, in on L1 or L2, out on common.
When both switches are set to L1 or to L2 the light operates, when they are set differently the light does not operate.

3 way>>
First switch as two way.
Second switch, connects L1 to L1 and L2 to L2. When switched over, it connects L1 to L2 and L2 to L1. Last switch, in on L1 or L2, out on common. Changing any switch will change the status of the light.

You need a change over switch if you have four wires + earths, not a two way switch.

[Edited by amtodd on 11-11-2002 at 12:07 PM GMT]

[Edited by amtodd on 11-11-2002 at 12:34 PM GMT]

 

[Hamiltonandy]

Called an intermediate switch. 4 times cost ordinary 2 way switch.