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A Guide To Electrical Wiring Colors Coding Graphic Products Graphic Products In the US, these colorcoded wires carry power from a circuit breaker to a device AC Power Alternating current (AC) is the power that comes out of outlets in homes and businesses Homes and offices 1, 8 or 240 Volts Phase 1 – Black wire Phase 2 – Red wire Phase 3 – Blue wire Neutral – White wire AC Power 1, 8, or 240 Volts AC Power is much more common in the United States and will be found in almost all environments Standard power levels include 1 volts, 8 volts, and 240 volts In these systems, the colors are usually going to be 120/208 panel wiring color guide