3 Way Switch Wiring Diagram. Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Cable d fig 2 is a three core and earth this is the 3 wire control that links the two light switches together.
Pick the diagram that is most like the scenario you are in and see if you can wire your switch. Black for live or hot wire. First you have to turn off the correct electrical panel circuit by adding this electrical box for the three way switch in that place or called basement.
The black line wire connects to the common terminal of the first 3 way switch.
A three conductor cable with a ground is then installed between the two 3 way switch boxes. Black for live or hot wire. Com on the first switch connects to com on the second switch l1 on the first switch connects to l1 on the second and l2 on the first switch connects to l2 on the second. 3 way switch wiring diagram line to light fixture.