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Technical Terms Reference Guide

  • ANSI - The American National Standards Institute verifies that the standard developers are complying with the consensus and all other approval criteria.
  • Boron-free E-Glass - Electrical grade fiberglass that has corrosion resistance greater than boron containing E-glass; it is environmentally friendly due to the lack of boron and fluorine.
  • Combined Load Charts - Also referred to as application curves; a graphical representation that shows how the maximum working loads interact for a given line post or braced line post assembly.
  • Corona - A luminous discharge resulting from ionization of the air surrounding a conductor around which a voltage gradient exceeding a certain critical value exists.
  • Dry Band Arcing - Electrical flashes that occur between wet and dry spots over the contaminated surface of an insulator.
  • E-Glass - Electrical grade fiberglass; the first glass used for high-voltage insulators.
  • Flashover - A disruptive discharge that is capable of breaking the insulation level provided by the air around the insulator, which creates an arc between parts of different potential or polarity.
  • IEC - The International Electrotechnical Commission develops and publishes international standards for all electrical technologies.
  • Leakage Distance - The distance between the conductive end fittings of the insulator across the insulator surface, moving in and out of the sheds; also commonly referred to as the creep or creepage distance.
  • RCL - Reference Cantilever Load is the maximum design cantilever load (MDCL), which is rated at 50 percent of the part's SCL.
  • RIV - Radio-Interference Voltages are caused by electric currents that produce magnetic and electrostatic fields that are capable of inducing high-frequency voltage pulses in nearby radio antennas. The RIV of an insulator is measured under conditions specified by industry standards.
  • RTV - Room Temperature Vulcanate (elastomer sealant) is a silicone rubber that cures at room temperature.
  • RTL - Routine Test Load is the maximum design tension load, which is rated at 50 percent of the part's SML. All parts are tested at this rating prior to being shipped.
  • Section Length - The straight-line distance between the coupling points of the insulator's end fittings.
  • SCL - Specified Cantilever Load is the minimum ultimate cantilever strength of the part.
  • SML - Specified Mechanical Load is the minimum ultimate tensile strength of the part.
  • Strike Distance - The shortest distance across the insulator surface, between the end fittings of the insulator; also commonly referred to as the dry arc distance or tight string distance.
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