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Electrically, a typical "3-way" switch is a single pole, double throw (SPDT) switch. By correctly connecting two of these switches together, toggling either switch changes the state of the load from off to on, or vice versa. The switches may be arranged so that they are in the same orientation for off, and contrasting orientations for on. [1]
English: "California" 3-way switch. Alternative to the conventional connection for a three-way switch. The lamp shell is never connected to the live terminal. A second lamp can be connected at A to light the end of a long corridor or as a pilot lamp to indicate the light in an outbuilding is left on.
Date/Time Thumbnail Dimensions User Comment; current: 14:10, 20 March 2010: 300 × 175 (34 KB): Salino01: Convert colour of lamp for better distinction of on and off
A 3-way lamp, also known as a tri-light, is a lamp that uses a 3-way light bulb to produce three levels of light in a low-medium-high configuration. A 3-way lamp requires a 3-way bulb and socket, and a 3-way switch. In 3-way incandescent light bulbs, each of the filaments operates at full voltage. Lamp bulbs with dual carbon filaments were ...
Description: SVG version of w:Image:3wayswitch.gif; schematic of a three-way w:light switch.: Date: 26 July 2006: Source: w:Image:3wayswitch.gif made by w:User:Ummit ...
Date/Time Thumbnail Dimensions User Comment; current: 01:00, 18 July 2007: 300 × 175 (37 KB): Cburnett {{Information |Description={{en|One of four positions for a two-location setup for turning a light on and off.}} |Source=Own work in Inkscape.
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Original file (SVG file, nominally 250 × 125 pixels, file size: 2 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.