I don't have the relevant Australian Standard at my fingertips at the moment and, as you are aware, the Australian Standard differs from the IEEE and ISO standards slightly but, from memory (IEEE standard):
EHV (Extra High Voltage) - above 132kV
HV (High Voltage) - above 36kV up to 132kV
MV (Medium Voltage) - above 1000V up to 36kV
LV (Low Voltage) - above 50V up to 132kV
ELV (Extra Low Voltage) - up to 50V
PV (Poofter Voltage) - anything instro's do (usually up to 5V or 10V.)



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