MV switchgear and HV switchgear?

Question

What do the abreviations stand for, and what is the difference?

Answer 1

LV (low voltage), MV (medium voltage), and HV (high voltage).

Switchgear is ranked depending on the application.

For the protection of electric machinery (rotating equipment):
LV for voltages less than 1000 Vac
MV for voltages between 1001 and 6900 Vac
HV for voltages greater than 6901 Vac.

For power transmission equipment (like lines and ttransformers, etc):
LV for voltages less than 4160 Vac
MV for voltages between 4161 and 26000 Vac
HV for voltages greater than 26001 Vac.

Answer 2

MV usually means Medium Voltage. HV is High Voltage. Around here, medium voltage is 2300-34,500 volts, above that it's HV.

Someone correct me if I have those numbers wrong.