In ANSI C84.1-2011, Clause 3, system voltage classes were explained

Low Voltage (LV)
A class of nominal system voltages 1000 volts or less.
Medium Voltage (MV)
A class of nominal system voltages greater than 1000 volts and less than 100 kV.
High Voltage (HV)
A class of nominal system voltages equal to or greater than 100 kV and equal to or less than 230 kV.
Extra-High Voltage (EHV)
A class of nominal system voltages greater than 230 kV but less than 1000 kV.
Ultra-High Voltage (UHV)
A class of nominal system voltages equal to or greater than 1000 kV.

The voltage ranges in accordance with ANSI C84.1-2011 is shown in Table 1.

NEMA C58.1

Download:ANSI C84

IMPORTANT NOTES:

  1. The latest edition of this standard ANSI C84.1-2020.
  2. For IEC Voltages, refer to this article.

Author

  • A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia, and Professional Electrical Engineer (PEE 2574 - 1st Place April 1991) - Philippines with extensive experience in concept selection, front-end engineering, HV & LV detail design, construction, and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and wastewater pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).

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