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Glossary of Terms - All Terms

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Glossary Subsets

Gauge Pressure (psig)

A pressure scale where atmospheric pressure is ignored, in other words, its zero point is atmospheric pressure (14.7 psia at sea level).


A machine for converting mechanical energy into electrical energy or power.

GPH (Gallons Per Hour)

Unit of measure representing volume of liquid flow.

GPM (Gallons Per Minute)

Unit of measure representing volume of liquid flow.

Ground Fault Interruption (GFI)

A unit which provides protection against ground fault currents below the trip levels of the breakers of a circuit. The GFI system must be capable of sensing the ground fault current and be able to disconnect any faulted circuit from its source voltage.


A connection, either intentional or accidental, between an electric circuit and the earth or some other conducting body.

Grounded Neutral

The common neutral conductor of an electrical system which is connected to ground to provide a current carrying path for the line to neutral load devices.