System Voltage Classes (ANSI)

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.

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IMPORTANT NOTES:

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