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)