Central Heating And Hot Water Wiring Diagram

Wires not joined In complex diagrams it is often necessary to draw wires crossing even though they are not connected. The simple crossing on the left is correct but may be misread as a join where the blob has been forgotten. The bridge symbol on the right leaves no doubt!

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.

SPST, on-off switch SPST = Single Pole, Single Throw. Current flows only when the switch is in the closed (on) position.

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.

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