Positive and Negative Wires Are What Colors?

The wiring technique and the location determine the colour of the wires. A typical two-wire, ungrounded circuit in the United States has a red positive wire and a black negative wire.

The positive wire is red and the negative wire is white in a two-wire system with a negative ground. The positive wire is white and the negative wire is black in a two-wire system with a positive ground. Finally, there are three-wire systems that include a white “centre tap” wire. For these systems, the positive wire is red, and the negative wire is black.

Misha Khatri
Misha Khatri is an emeritus professor in the University of Notre Dame's Department of Chemistry and Biochemistry. He graduated from Northern Illinois University with a BSc in Chemistry and Mathematics and a PhD in Physical Analytical Chemistry from the University of Utah.


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