Y Plan Wiring Diagram

SPDT, 2-way switch SPDT = Single Pole, Double Throw. A 2-way changeover switch directs the flow of current to one of two routes according to its position. Some SPDT switches have a central off position and are described as on-off-on.

DPST switch DPST = Double Pole, Single Throw. A dual on-off switch which is often used to switch mains electricity because it can isolate both the live and neutral connections.

Earth (Ground) A connection to earth. For some electronic circuits this symbol is used for the 0V (zero volts) of the power supply, but for mains electricity and some radio circuits it really means the earth. It is also known as ground.

If the circuit is complex: Try to arrange the diagram so that signals flow from left to right: inputs and controls should be on the left, outputs on the right. You may omit the battery or power supply symbols, but you must include (and label) the supply lines at the top and bottom.

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