Illustrations of the most common medium voltage and low voltage electrical distribution systems used in North America.

Medium Voltage

The most widely used medium voltage (2.4 to 35 kV) alternating current (AC) electrical distribution systems.

Medium voltage, three phase wye (star), three wire electrical system

Three phase wye (star), three wire

Three phase delta, three wire medium voltage electrical system

Three phase delta, three wire

Three phase star, four wire, rounded neutral, electrical distribution system

Three phase star, four wire, grounded neutral

Low Voltage

Typical low-voltage systems (0 to 2,000 V).

Three phase (wye) start, three wire, grounded neutral low volatge electrical distribution system

Three phase wye (star), three wire, grounded neutral

Three phase delta, four wire, grounded neutral low voltage electrical distribution system.

Three phase delta, four wire, grounded neutral

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