Hence there are no wire color codes for the ungrounded DC system under the US National Electrical Code. US National Electrical code has discouraged the usage of ungrounded systems for safety reasons. Function IEC Standard Label Color Protective earth PE Green-Yellow Two-wire unearthed DC system Positive L+ Brown Negative L- Grey Two-wire earthed DC system Positive (Negative earthed) circuit L+ Brown Negative (Negative earthed) circuit M Blue Positive (Positive earthed) circuit M Blue Negative (Positive earthed) circuit L- Grey Three-wire earthed DC system Positive L+ Brown Mid-wire M Blue Negative L- Grey IEC Standards for DC voltage cable US DC Power Circuit Wire Color Codes IEC Standards for DC voltage cable are as shown in the table below. The US National electrical code is different from IEC. IEC (International Electrotechnical Commission) gives a standard for wiring code.
But “DC power” is used more broadly to denote that the circuit itself is DC, not AC).
The term “DC power” is often used instead of “DC voltage” when speaking about wire color codes (note: DC power is not interchangeable with the term DC voltage.
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