Also known as: hd.
HD has various meanings in the Architectural category. Discover the full forms, definitions, and usage contexts of HD in Architectural.
A lightning impulse classifying current category for distribution class arresters defined by ANSI/IEEE C62.11. A heavy duty rated arrester has a 10,000 amperage impulse value crest (refer to normal duty).
ArchitecturalThe measure of the pressure of water expressed in feet of height of water1 psi = 2.31 feet of water. The measure of pressure at the base or other reference point of a column of fluid. Normally measured in feet of water. The product of the water's weight and a usable difference in elevation gives a measurement of the potential energy possessed by water.
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