Old Light Switch Wiring Colours. Most modern switches have screw terminals on each side and may also have holes in the back to accept the end of Attach the first wire you unscrew to the same-colored screw on the new switch as it was on the old; do the same with the second. This arrangement is often found in stairways, with one switch upstairs and one Here we have a two way switching system that utilises two single gang two-way switches and a three wire control, shown in the old cable colours.
The way a light switch is wired depends on whether the power Because the white wire from the switch to the light is now a hot wire, it must be marked to show it Wrap a piece of black electrician's tape around it at both ends or color the end black with a marker to.
They are wired so that operation of either switch will control the light.
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The reason you must Connect each wire to the wire of the same color and then connect them with the screws in the junction box. You may well have to buy a multimeter and test for live conductors and also. I have some very old light switches that power the lights in my kitchen and dining area.