Light Wiring Diagrams

How to wire a three way switch

We’ve uploaded new diagrams for three way switching (sometimes referred to as two way switching plus intermediate). so if you plan on doing some house wiring you’ll find Full instructions, schematic diagrams and installation illustrations:

These light circuit diagrams will be of use if you have 3 light switches that control a single light.

If you have the old cable colours you need
3 way switching (old colours)

If you have the new cable colours you need:
3 way switching (new cable colours)


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1 gang intermediate light switch

The intermediate light switch is used where three or more switches control one light and used in conjunction with two two way light switches to achieve this

single gang switch face

single gang switch face

Single gang intermediate light switch

Single gang intermediate light switch

Light switch mechanism

Intermediate light switch mechanism

Intermediate light switch mechanism

There are four terminals, usually L1, L1 and L2, L2. In one position, L1 and L2 are connected in pairs. In the other position, alternate pairs are connected.


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2 gang intermediate light switch

The intermediate light switch is used where three or more switches control one light and used in conjunction with two two way light switches to achieve this. It is effectively two single gang intermediate switches on one face plate.

Double gang swith face plate

Double gang switch face plate

Double gang intermediate light switch

Fig 2: Double gang intermediate light switch

Light switch mechanism

Intermediate light switch mechanism

Fig 3: Intermediate light switch mechanism

Each of the gangs (or switches) above in Fig 2 (of which there are two) work like this (Fig 3): There are four terminals, usually L1, L1 and L2, L2. In one position, L1 and L2 are connected in pairs. In the other position, alternate pairs are connected.


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