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Color Convention for Power Wires

jw0752

     I am aware of the color convention for Positive and Negative wires in electronics. Red is Positive and Black is Negative. The other day as I was hooking up a small dual supply OpAmp it dawned on me that I did not know what the color convention is for the Zero Volt Ground wire between the two supplies. Does anyone know if there is a Color Convention for this Zero wire and what that color is? Also it would be interesting to know if there are any other standardized color conventions for hookup wires such as signal or output.

 

John

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    Good question.

     

    I've tended to use Red and Black as well.

    If the voltages were mixed I often used Orange for 12v.

     

    Mains wiring tends to use Green for Earth or Ground and is a wise choice, but black is also suitable since it is being used as the negative.

     

     

     

    It may not be readily obvious to many people, but in the USA black is often used as the phase colour, while we tend to use Brown or Red.

    The latest convention is Phase can be any colour except Green or Green/Yellow.

     

    Mark

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  • 0

    Good question.

     

    I've tended to use Red and Black as well.

    If the voltages were mixed I often used Orange for 12v.

     

    Mains wiring tends to use Green for Earth or Ground and is a wise choice, but black is also suitable since it is being used as the negative.

     

     

     

    It may not be readily obvious to many people, but in the USA black is often used as the phase colour, while we tend to use Brown or Red.

    The latest convention is Phase can be any colour except Green or Green/Yellow.

     

    Mark

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