High Voltage System
An electric power system having a maximum roo-mean-square ac voltage above 72.5 kilovolts (kv).
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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.
HPS
High Pressure Sodium
HRC
High Rupturing Capacity (applicable to fuses).