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A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.
When a hose is inserted into an inlet, or the switch on a hose is turned on, two low-voltage electrical contacts (highlighted in red) are bridged, signalling the power unit to turn on. To use a central vacuum, the vacuum hose is removed from storage and fitted with any needed cleaning accessories (such as a brush).
Homes typically have several kinds of home wiring, including electrical wiring for lighting and power distribution, permanently installed and portable appliances, telephone systems, heating or ventilation system control, and increasingly for home theatre and computer networks.
Only the hose and cleaning head need be carried from room to room, and the hose is commonly 8 m (25 ft) long, allowing a large range of movement without changing vacuum inlets. Plastic or metal piping connects the inlets to the central unit. The vacuum head may be unpowered, or have beaters operated by an electric motor or by an air-driven turbine
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A home appliance, also referred to as a domestic appliance, an electric appliance or a household appliance, [1] is a machine which assists in household functions [2] such as cooking, cleaning and food preservation.
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