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Three lines with a numeral and phase notation.
Also known as: Three phase marking, Polyphase supply symbol
A three-phase supply is drawn as three conductors, usually with a neutral and an earth, and marked with the number of wires. The arrangement delivers steady power rather than the pulsing of a single phase, which is why industrial motors use it.
Marks a supply of three alternating voltages equally spaced in time, drawn as three conductors with optional neutral and earth.
Contexts: Technical drawing, Electrical equipment
Delivers constant total power rather than the twice-per-cycle pulsing of a single-phase supply, which is why rotating machinery is fed this way.
Contexts: Technical drawing, Electrical equipment
Three parallel lines marked with a numeral and a short diagonal stroke count showing the number of conductors.