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For example, this allows lighting in a hallway, stairwell or large room to be controlled from multiple locations. An optional additional lamp can be connected at Terminal A as a pilot lamp, or to illuminate a long corridor. This article follows American usage. In other projects Wikimedia Commons. For more than two locations, two of the interconnecting wires must be passed through an intermediate switch, wired to swap or transpose the pair. Systems based on relays with low-voltage control circuits permit switching the power to lighting loads from an arbitrary number of locations.

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