Wire / Pipe / Gas Color Codes

NEC, IEC, gas piping, and ASME A13.1 conventions in plain English.

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(reference page; no compute) NEC conductor color conventions, IEC three-phase color conventions, and ASME A13.1 piping identification color scheme.

NEC 2023 (NFPA 70). Sections 200, 210, 215, 250 by section. ASME A13.1-2020 by name. IEC 60446 (replaced by IEC 60445) by name.

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