MEZZ light switch

15 Nov 2005
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Cook Islands
Mezz said:
I have just bought a new two gang two way switch for my hall and landing lights. The old switch terminals are labelled (top) com, L1 and L2 and (bottom) L1, L2 and com.
The new switch is labelled (top) L and L and (bottom) L1, L2, L1 and L2. How do I wire up the new switch. Both cables coming into the switch contain red, blue, yellow and earth cables.

I hope that you have drawn a diagram of how the wires are attached to your old switch, showing terminal numbers and colours, and which cable they come from.

You attach then to the new one in the same way. Old "L" is new "COM".

Although the switch seems to have 6 terminals, it is in fact made up of two switches, each with 3 terminals and arranged in a triangle, Sometimes the moulding marks on the back of the switch enable you to see how it has two sides to it. One will be for the upstairs lights and one for the downstairs lights. The current goes in through the "COM" and out through either the L1 or the L2 depending on the position of the switch tumbler.

The earth wires are all to be sheathed in greeen and yellow and attached to the terminal in the wall box at the back.

If the switch is metal faced you need an extra earth wire to connect from the wall box terminal to the metal faceplate.

Edited: It is in //
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