Basic AC Power
Three-phase circuits are summarized below.
Three-Phase Circuits Summary
Three-phase power systems are used in the industry because:
Three-phase circuits weigh less than single-phase circuits of the same
They have a wide range of voltages and can be used for single-phase
Three-phase equipment is smaller in size, weighs less, and is more
efficient than single-phase equipment.
Unbalanced three-phase circuits are indicated by abnormally high currents in one
or more of the phases.