![]() ![]() The C-type wiring circuit was used in the old days with the purpose of saving some lengths of wire but it is not used today for two good reasons. Otherwise the light will not be alternately turned on and off in all combinations.Īs it was mentioned at the A-type section more than one intermediate switch might be installed in between the two-way switches. It is important that the live wire and the wire to the lamp are connected to the same side (here at the left side). Wiring diagram of the B-type 3-way switching circuit. This wiring scheme is characterized by a wire in between the common terminals of the 2-way switches. Wiring diagram of the B-type 2-way switching circuit. It might be an advantage in comparison with the A-type that the live wire is present at two locations at the B-type wiring scheme in case of a socket outlet. In the B-type multi-way switching circuit a wire is connected in between the common terminals of the two-way switches. This is also true with the B- and C-type wiring schemes that follows. With further intermediate switches situated in series in between the two 2-way switches it is possible to turn the light on and off at as many locations as might be desired. The only difference from the above mentioned 2-way switching circuit is an intermediate switch situated in between the two 2-way switches. Wiring diagram of the A-type 3-way switching circuit. With the present positions of the switches the light is off - there is no current path from the live wire to the neutral. Wiring diagram of the A-type 2-way switching circuit showing the wire connections between two 2-way switches and a lamp. ![]() The wires in between the electrical switches are called 'strappers' (UK) or 'travellers' (US). The lighting fixture is connected to the common terminal of the other two-way switch. ![]() In the A-type multi-way switching circuit the live wire is connected to the common terminal of one of the two-way switches. It will be seen in the following diagrams that these switches are placed in between the before-mentioned two-way switches in all wiring circuits (A-, B- and C-type). When more than two locations where to turn the light on and off are necessary the extra switches must be of another type called intermediate switches (UK) or four-way switches (US). In the US the screw at the common terminal might be marked with the colour black. These types of switches might be marked with a C for the common terminal and L1 and L2 at the other terminals.
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