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Also, keep in mind that ignition is based solely on the amount of natural light present and not on the height of the sun, so "unwanted ignition" may occur, for example in the presence of compact clouds associated with a significant drop in ambient light on the sensor (e.g., when there is a storm). To avoid this, twilight switches can be ...
The electric pump is to be arranged to be turned on and off at regular intervals by the time switch to administer (fairly) precise and regular water quantities. [1] This approach, used frequently in DIY watering systems, allows financial savings as the water timer can be discarded. For high-end applications, water timers sometimes allow more ...
System tests could be conducted in one of two ways: In a coded pull station, there is either a test hole on the front (usually activated with an Allen wrench) or a test switch on the inside. Turning the switch one way causes the notification appliances to sound continuous (or in the case of single-stroke bells, ding once). Turning it the other ...
A fire sprinkler system is an active fire protection method, consisting of a water supply system providing adequate pressure and flowrate to a water distribution piping system, to which fire sprinklers are connected. Although initially used only in factories and large commercial buildings, systems for homes and small buildings are now available ...
A fire sprinkler mounted on a ceiling. A fire sprinkler or sprinkler head is the component of a fire sprinkler system that discharges water when the effects of a fire have been detected, such as when a predetermined temperature has been exceeded. Fire sprinklers are extensively used worldwide, with over 40 million sprinkler heads fitted each year.
The Carter system, also known as the Chicago system, was a method of wiring three-way switches in the era of early knob-and-tube wiring. This now-obsolete wiring method has been prohibited by the USA National Electrical Code since 1923, [ 2 ] even in new knob-and-tube installations which are still permitted under certain circumstances.
A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic ...
Sprinkler system may refer to: Irrigation sprinkler, a device for irrigation of lawns or crops; Fire sprinkler system, the entire systems of pipes and sprinklers ...
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