Glossary – G

Galvanic Action: An electrochemical action that generates electrical current between two metals of
dissimilar electrode potential.


Galvanization: The process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc.


Gauge: A measurement (as of linear dimension) as described by a standard or system: such as the distance between the rails of a railroad, the thickness of a thin material (as sheet metal or plastic film), or the diameter of a slender object (as wire).


Granule: An opaque, natural or synthetically colored aggregate commonly used to surface cap sheets, shingles, and other granule-surfaced roof coverings.


Gravel: Coarse granular aggregate resulting from the natural erosion of rock.


Ground: Earth potential. Exposed metal parts of electrical equipment are sometimes maintained at ground potential to prevent electrical shock.


Ground Fault: Any point on an ungrounded motor component where the resistance to the frame is 1 megohm or less.


Grounding Conductor: The wire between the electrical device and earth.


Groundwater Level: The depth or elevation above or below sea level at which the surface of groundwater stands.


Grout: A mixture of cement, sand, and water used to fill cracks and cavities in masonry.


Guideline: A standard principle by which to make a judgment or determine a policy or course of action.