Earth or protective conductor: Green/Yellow or Green or bare copper conductor. ![]() 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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