Transformer color codes 3 wire

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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.

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Heatsmart Standard Wiring/Color Codes Using Peak Interrupter Panel. The color code adopted in the US is as follows: 3 Phase Padmounted Transformer Slab 15KV 750-2500 KVA Dead Front. 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.

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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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