Three way light switching circuit diagram (old cable colours). All earth wires should connect to the earth terminal in the switch . This is because the terminology used is very different. So for the benefit UK visitors . No problem, I can help you with that.
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Two-way light switches are required for three way switching, these can be . By connecting one or more 4-way (intermediate) switches in-line, with - way switches at either en the load can be controlled from three or more . The most basic circuit, with only two wires at the switch. This arrangement would typically be used in conduit, and uses two wires between each switch. How to wire - way switches using NM (Romex) cable with wiring diagrams included.
Unhook the wires to the switch (Photo 1). In most cases, the existing electrical box will be too small to contain the additional wires and connectors needed for the three - way switch (see “Sizing the Box,” below, to find out).



