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From IEEE 141

3.1.1.2 System voltage classes 3.1.1.2.1 low voltage: A class of nominal system voltages less than 1000 V. 3.1.1.2.2 medium voltage: A class of nominal system voltages equal to or greater than 1000 V and less than 100 000 V. 3.1.1.2.3 high voltage: A class of nominal system voltages equal from 100 000 V to 230 000 V.