Electrical Contractor Terminology Glossary H
Find an electrical engineering term alphabetically:
|H – Henry.|
|H-20 – Also referred to as “HS20-44” or “H20-44” Bridge Loading. H20 Loading refers to a maximum front wheel loading of 8000 lbs and a maximum rear wheel load of 16,000 lbs with an impact factor of 30% added (16000 x 1.30) for a total maximum wheel loading of 20,000 lbs.|
|H2 – Hydrogen.|
|H20-44 – See “H20”.|
|Half-duplex communications – A communications system in which data can travel in both directions, but only in one direction at a time.|
|Hard Drawn – Wire that has been drawn to its specific size and not annealed.|
|Hard Line – A Steel Pulling line. Also see Bull Line.|
|Harmonic – A sinusoidal component of the voltage that is a multiple of the fundamental wave frequency.|
|Harmonic Distortion – The presence of harmonics that change an AC waveform from sinusoidal to complex. They can cause unacceptable disturbance to electronic equipment.|
|Hazard Risk Category – 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 as follows: 1- 4 cal/cm²; 2- 8 cal/cm²; 3- 25 cal/cm²; 4- 40 cal/cm².|
|Heat Run Test – A test that is used to determine the increase in operating temperature at a given load.|
|Helical – Wrapped in a spiral fashion. Refers to the way the strands of a conductor are laid.|
|Henry – 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 at the rate of one ampere per second.|
|Hertz – 1) A unit of frequency equal to one cycle per second. 2) In alternating current, the changing of the negative and positive poles.|
|HID – High Intensity Discharge.|
|High Intensity Discharge (HID) Lamp – An electric discharge lamp in which the light producing arc is stabilized. Examples of HID lamps include High Pressure Sodium, Metal Halide and Mercury Vapor.|
|High Pot – A test done to confirm the reliability of an insulation system where a high voltage is applied.|
|High Pressure Sodium (HPS) Lamp – A High Intensity Discharge light source in which the arc tube’s primary internal element is Sodium Vapor.|
|High Voltage – An electrical system or cable designed to operate between 46kv and 230kv.|
|High Voltage System – An electric power system having a maximum roo-mean-square ac voltage above 72.5 kilovolts (kv).|
|High-speed reclosing – A re-closing scheme where re-closure is carried out without any time delay other than required for deionization.|
|Hooks – See “Climbers”.|
|Hookstick – An insulated stick, usually made of fiberglass, that is used to work energized overhead conductors and operate electrical equipment.|
|Horsepower – A unit of work. When used to show power usage, one horsepower is equivalent to 746 watts.|
|Hose – Slang for “Line Hose”.|
|Hot – Refers to an energized conductor or apparatus.|
|Hot Arm – A device that is used to temporarily extend a conductor beyond the cross arm it was on.|
|Hotstick – An insulated stick, usually made of fiberglass, that is used to work energized overhead conductors and operate electrical equipment that is overhead, underground and pad mounted.|
|HPS – High Pressure Sodium.|
|HRC – High Rupturing Capacity (applicable to fuses).|
|HS20-44 – See “H-20”|
|HS285 (TM) – Aluminum Conductor, Steel Supported with Extra High Strength Steel Core. HS285 is a Trademark of Southwire Company.|
|HSR – High Speed Re-closing.|
|HV – High Voltage.|
|Hybrid Photovoltaic System – A photovoltaic system that includes other sources of electric generation such as wind or fossil fuel.|
|Hydrometer – A float type instrument used to determine the state-of-charge of a battery by measuring the specific gravity of the battery electrolyte (i.e., the amount of sulfuric acid in the electrolyte).|
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