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.

NEMA C58.1

Download:ANSI C84