2 Way Light Switch Wiring Diagram Old Colours. Two way switching using a 3 wire control shown in the old cable colours note. You have an incoming hot wire black going to one screw it does not matter if you use the brass or silver screw on the side of the 2 way switch and a black wire from the other screw on the 2 way switch going to the load light ceiling fan etc.
The grey wire in cable d is a switched live and the blue wire in cable c and black wire in cable d are permanent lives and thus should be marked with brown sheathing at each end as shown. 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. A 2 way switch wiring diagram with power feed from the switch light.
Two way switching using a 3 wire control shown in the old cable colours note.
You will see that there is a hot wire that is then spliced through a switch and that then goes to the hot terminal of the light. The wiring colours changed a number of years ago from live red neutral black. The blue and yellow wires in cable d and the black wire in cable c are switched lives and thus should be marked with red sheathing at each end as shown. The power source comes from the fixture and then connects to the power terminal.
