Wiring A Two Way Light Switch Old Colours. Black wire power or hot wire. 2 way light switch 3 wire system new harmonised cable colours 2 way switch 3 wire system old cable colours 2 way switch two wire control three way switching.
When wiring a 2 way switch circuit all we want to do is to control the black wire hot wire to turn on and off the load. Two way switching 3 wire control old colours here we a have a schematic fig 1 which makes it easy to visualise how this circuit works. Black wire power or hot wire.
You re not allowed to use normal blue brown green yellow tps to wire two way switch circuits anymore even using.
This wire is green or bare copper and may or may not be attached to your old switch. If your circuit has the old cable colours see. In this state the lamp is off changing the position of either switch will switch the live to the lamp turning it on. 2 way light switch 3 wire system new harmonised cable colours 2 way switch 3 wire system old cable colours 2 way switch two wire control three way switching.
