July 2, 2011

Electrical Engineering Terms - H

  • 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 2
  • 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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