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Threephase transformer with four wire output for 8Y/1 volt service one wire for neutral, others for A, B and C phases Threephase electric power (abbreviated 3φ) is a common type of alternating current used in electricity generation, transmission, and distribution It is a type of polyphase system employing three wires (or fourPhase 2 – Orange wire Phase 3 – Yellow wire Neutral – Gray wire Ground – Green, green with yellow stripe, or bare wire When powering highervoltage devices, be sure you are labeling wires and cables accurately and add safety signs, where needed This identification can be used during a lockout tagout, should the equipment need to be deenergizedBrown, orange and yellow are used for 480 VAC Australia also has a different wiring color standard The UK's new cable colors for plugs are now harmonized with Europe's power cable colors for AC & DC Power Distribution Single Phase And Three Phase Distribution Equipment 120/208 three phase wiring