Two way two wire switching

[ohmeelectrical]

We have come across an installation with only two core cable supplying both switches, the earth is not used and only common and l1 are used on both switches. Can anybody supply a diagram of the wiring of such a system?

 

[gaffer]

Maybe theres a relay tucked away somewhere?

 

[wattsup]

>>Can anybody supply a diagram of the wiring of such a system>> Paul Daniels?

 

[zupos40]

We have come across an installation with only two core cable supplying both switches, the earth is not used and only common and l1 are used on both switches. Can anybody supply a diagram of the wiring of such a system?

Is it domestic or industrial does it function as a two way switch, finally are you certain only two conductors at each switch.

 

[ohmeelectrical]

It is domestic, appeared to work as a two way arrangement and has definitely got only two wires to each switch. I have searched through all my paperwork and can't see anything like it. I can't understand how it could possibly work.

 

[ryanryan]

just an idea...
could it be 2 normal 1 way lighting circuits, suppling one fitting!!

 

[stretchyboy]

are they standard switches or time-lag ones or even push-to-make ones as this will give us a clue as to whether there is some form of electronics behind it all

 

[andekoch]

check there is no jump lead suppling the live in one of the 2 way switches, common if one of them is a part of a 2 gang.

 

[Gravid]

Sounds like half a 2 way or half a job, will only work if both switches are in the correct position. Come across this a couple of times DIY speciallity.

 

[sparks1234]

There are systems about which work like this but its not normal run of the mill etc etc