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Staircase timer
A staircase timer is an electrical switch used to control lighting on a staircase, corridor or lobby. A single action turns on the lights and they remain on for long enough to ascend or descend the stairs. They turn themselves off automatically.
== Operation ==
In a single occupancy domestic dwelling it is usual to provide two-way switching. The lights may be turned on or off from either the top, bottom or intermediate floors of the staircase. They remain on until turned off manually.
In a multiple occupancy dwelling, the drawback is that the cost of shared lighting is usually paid by the landlord. Individual tenants turn lights on, but have little reason to turn them off. Particularly so in the days of incandescent lamps this could be an appreciable cost. For this reason shared dwellings favour timers for staircases instead. The lights are turned on by a push-button switch on any floor. They remain on automatically for an adequate time to climb the stairs, then turn themselves off.
To provide longer lighting times when required the button may be pressed repeatedly. For this reason any timer should be a retriggerable monostable, i.e. the off delay lasts from the time of the ''last'' button press. There may also be a switch, sometimes a key switch, that can turn the lights on indefinitely for tasks such as cleaning.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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