![]() ![]() All of the additional switches are internediate types (4 terminals), and connect into the middle of the circuit in exactly the same way.Ī dimmer switch can be used on any of these circuits, but for two switches and above, only one of them can be a dimmer. Four or more switchesīoth of the three way switching diagrams can be extended to four, five or even more switches. The middle switch is an intermediate type. Most likely to be found with wires in conduit. Usually the third wire passes the middle intermediate switch but is joined in a separate terminal block. ![]() Three wires between the two end switches, probably using 3 core and earth cable. This is also known as the 'conversion' method, since it is the easiest way to add a second light switch to an existing circuit. Twin+earth from the ceiling rose to the first switch, and three wires between the switches, usually 3 core and earth cable. Such an arrangement is not permitted, as isolating only one of the circuits leaves live wiring depending on the position of the light switches. Unfortunately, this is usually encounted in stairwells, with the line from the downstairs lighting circuit and the neutral connected to the upstairs lighting circuit. It can also be used in domestic properties by using twin+earth cable between the switches, and 1core+earth from the switches to the ceiling rose. This arrangement would typically be used in conduit, and uses two wires between each switch. The most basic circuit, with only two wires at the switch. These diagrams show various methods of one, two and multiple way switching. ![]()
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