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Glossary

Electrical Engineering Terms U

Ufer ground. Name after the man who invented and tested it, a Ufer ground is a grounding electrode consisting of at least 20 feet (6 m) of 1/2-inch (13 mm) rebar (either a continuous single bar or shorter lengths tied-wired together) or of at least 20 feet of wire-size 4 …

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Electrical Engineering Terms V

Variable Frequency Drive A technology where the rotational speed of an electric motor is controlled or varied electronically. Varying Duty. If an electric motor is nameplate-rated with this type of duty cycle, it is rated to operate at loads, and for intervals of time, both of which may be subject …

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Electrical Engineering Terms W

Wire-Wound Rotor (Wound-Rotor Motor or just Wound Rotor). As compared to a squirrel-cage rotor of an electric motor in which aluminum is cast over a steel rotor frame in a mold, the armature circuit of this rotor consists of preformed wraps of insulated wire (windings) similar to the field windings …

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