How to Replace a 2-Gang Switch

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Woodie's DIY will show you how to replace a two gang switch. You may need to do this if the case is broken or for decorative reasons.

How to do it

These instructions serve as a guide only. If in any doubt or your job differs in any way from the job described, consult a qualified electrician.

Step 1

Safety first! Make sure the electricity has been turned off at the fuse box before starting work.

If possible lock the fuse box, if not put electrical tape over the switch on fuse box or leave a note to make sure nobody turns power back on while you are working.

Step 2

Read the instructions of the new switch before starting work.

Step 3

Unscrew the old switch and leave to hang on the wall. Keep the old screws in case you need them later with the new fitting.

A good idea is to take a photo of the wires in place with your mobile phone camera.

Step 4

Take a note of which wires go to each terminal. When dealing with wires always remember:

• Green/Yellow = Earth
• Brown = Live
• Blue = Neutral

In an older house the wires could be different colours:

• Red = Live
• Black = Neutral
• Green = Earth

If you do not have an earth wire at the switch, do not attach any metallic switches to this fitting e.g. brass/chrome.

Step 5

When dealing with a two-gang switch, the best way to approach this is to connect one wire at a time. First remove the common “Com” wire from the old switch and attach to the “Com” terminal in the new switch. Next, remove the “L1” wire from the old switch and attach to the “L1” terminal in the new switch.

Step 6

Finally, if there is an “L2” wire present for 2-way switching, example for hallway to landing, remove this from the old switch and attach to the “L2” terminal in the new switch. There may not always be an “L2” wire present. Repeat this process for the second switch on the fitting. Ensure all connections are fully tightened.