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An open transition transfer switch is also called a break-before-make transfer switch. A break-before-make transfer switch breaks contact with one source of power before it makes contact with another. It prevents backfeeding from an emergency generator back into the utility line, for example. [1]
An automatic door, also known as an auto door, is a door that opens automatically, without the need for human intervention or usually upon sensing the approach of a person. A person can be detected by microwave pulses, infrared sensors , or pressure-sensing pads.
Key: *a) head rope *f) loop of the sheet bend being tied *n) netting shuttle *s) gauge *z) tongue of the netting shuttle (makes it easier to load the twine so that it does not twist as it is used) Mending a net; binding a length of net to a new head rope. Note that, unusually, the gauge of the row being worked is larger than the gauge of the ...
The operator is placed in the space above the sliding door. An electric motor, geared down to get a lower speed and a higher torque, drives a pulley at one end of a belt. The door is clamped to the belt. To open the door, the motor turns the pulley, which in turn turns the belt, which in turn drags the door. To close the door, the reverse occurs.
Swing side, door mounted sensor—mounted on the swing side of the door itself, used as the door is opening to detect a user in the way of the opening door. In that case, the operator stops the door. The sensitivity of infrared sensors must be reduced at the end of the opening angle, if it starts seeing a wall next to the door, so it may not ...
Markus Alexej Persson was born in Stockholm, Sweden, to a Finnish mother, Ritva, [2] and a Swedish father, Birger, [3] on 1 June 1979. [4] [5] [2] He has one sister.[2] [6] He grew up in Edsbyn until he was seven years old, when his family moved back to Stockholm.
A standby generator is a back-up electrical system that operates automatically. [1] Within seconds of a utility outage an automatic transfer switch senses the power loss, commands the generator to start and then transfers the electrical load to the generator. The standby generator begins supplying power to the circuits. [2]
The sequence of events is similar for manual or automatic synchronization. The generator is brought up to approximate synchronous speed by supplying more energy to its shaft - for example, opening the valves on a steam turbine, opening the gates on a hydraulic turbine, or increasing the fuel rack setting on a diesel engine.