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Utilities
Of or related to any publicy utility institution mandated with maintaining the infrastructure for a particular public service; such as the provision of water, gas and electricity.
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Utilities > Electricity 
harmonic
Electrical equipment; Electricity
A sinusoidal component of the voltage that is a multiple of the fundamental wave frequency. Harmonics are primarily the result of the today's modern electronic equipment. Today's ...
harmonic distortion
Electrical equipment; Electricity
The presence of harmonics that change an AC waveform from sinusoidal to complex.
hazard risk category
Electrical equipment; Electricity
Categories defined by NFPA 70E-2004 to explain protection levels needed when performing tasks. The values range from 1 to 4. ATPV rated PPE is required for categories 1 through 4 ...
heat run test
Electrical equipment; Electricity
A test that is used to determine the increase in operating temperature at a given load.
helical
Electrical equipment; Electricity
Wrapped in a spiral fashion. Refers to the way the strands of a conductor are laid.
henry
Electrical equipment; Electricity
The meter-kilogram-second unit of inductance, equal to the inductance of a circuit in which an electromotive force of one volt is produced by a current in the circuit which varies ...
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- Electricity (7954)
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- Gas (1175)
- Sewage (66)