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WATT (W)
The
unit of power. Equal to one joule per second
Watertight
So constructed that
water/moisture will not enter the enclosure under specified test conditions.
Weatherproof
So constructed or
protected that exposure to the weather will not interfere with successful
operation.
Zero Signal Reference
A connection point, bus, or conductor used as one side
of a signal circuit. It may or may not be designated as ground. Is sometimes
referred to as circuit common.
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