What is the definition of low voltage, medium voltage, high voltage and extra high voltage?

Definitions vary somewhat but a general guide to the voltage categories are as follows:

Low Voltage:              up to             1000V

Medium Voltage:       between       1000 V and 35 kV

High Voltage:              between       35 kV and 230 kV

Extra High Voltage:    from            230 kV and above

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