System Voltage

Low Voltage Connections (up to 1000V)

The following standard voltages apply:

• Single phase connections; 230V (phase-neutral)
• Two and three phase connections; 230V (phase-neutral) and 400V (phase-phase)
• Split phase connections; 230V (phase-neutral) and 460V (phase-phase)

The voltage should remain within +10% and –6% of these figures.

High Voltage Connections (above 1000V)

Large commercial or industrial installations are often connected at high voltage. A number of different standard voltages are in use within Western Power Distribution’s area, including:

• 6600V (phase-phase)
• 11000V (phase-phase)
• 33000V (phase-phase)
• 66000V (phase-phase)
• 132000V (phase-phase)

The voltage should remain within ± 6% of the nominal connection voltage, with the exception of 132000V connections where the tolerance is ± 10%.