![]() For single-phase, Black (for 120V) or Red (for 277) is used for Line and Grey is used for Neutral.Earth or protective conductor: Green/Yellow or Green or bare copper conductor.You might see orange wires in the fire alarm circuit as well. homes, orange is most commonly used like a red wire, particularly in a 240-volt circuit where two hot wires are needed. Phase – 1: Black (for 120, 208, or 240 V), Brown (for 277, or 480 V). The National Electrical Code (NEC) says that white or gray must be used for neutral conductors and that bare copper or green wires must be used as ground wires. Rounding out the electrical wire color code are orange, brown, pink and violet.The color code adopted in the US is as follows: NEC does not instruct any requirements for other conductors. NEC mandates the color codes for neutral and protective ground as grey and yellow-green respectively. National Electrical Code is followed in the United States and sometimes in Canada. The above-mentioned color codes are followed in the E uropean Union, United Kingdom, China, Hong Kong, Argentina, Russia, Ukraine, Belarus, Kazakhstan and Singapore. (of a Positive Grounded) DC Circuit system: (of a Negative Earthed) DC Circuit system:
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