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An astronomical (or astronomic) timer calculates dawn and dusk times (tracking the sun position) for each day of the year based on the latitude and longitude (or just north/central/south and time zone on more cheaply made ones), and the day of the year (month and date), programmed by the user upon installation in addition to the usual time of day, except in the case of GPS enabled astronomic ...
By means of a light intensity sensor ( photoresistor, photodiode, phototransistor, etc.) that detects the amount of light that illuminates an environment, it triggers an electrical circuit that opens or closes the contacts of a mechanical relay or of a solid state relay. (power transistor, thyristor, triac, etc.), which activates the lighting ...
It is prevalent in the outdoor event lighting and audio power industry as an outdoor-safe replacement for NEMA connectors. In the United States it is not usually used for three phase power but for the high leg delta wiring of split-phase electric power (unknown in Europe). This allows one to choose single-phase AC power at either 110–120 ...
Leviton Manufacturing Company, Inc. is an American manufacturer of electrical wiring equipment in North America. The company produces electrical outlets including GFCI and USB charging devices, network infrastructure, lighting control systems, load centers and circuit breakers, EV charging stations, and utility submetering. [1]
Crystal Lake in Angeles National Forest, Azusa, California. Photo taken in July 1998 after a rainy season following a period of El Niño.. The Crystal Lake Recreation Area is located in the San Gabriel Mountains of Southern California, administered by the San Gabriel Mountains National Monument (formally the San Gabriel River Ranger District) of the United States Forest Service.
Lighting and power receptacle circuits in North American systems are typically radial from a distribution panel containing circuit breakers to protect each branch circuit. [8] The smallest branch circuit rating is 15 amperes, used for general purpose receptacles and lighting.
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