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Construction Concerns: Electrical Color Codes

09/10/2007
Article and photos by Gregory HavelDownload this article as a pdf!Electricians use different colors of insulation on wire to show its function and sometimes its voltage. In larger wire sizes, especially in older installations, these wires could all have black insulation, and each wire could have a band of colored tape or paint near each end. These color codes were adopted by electricians as a safe work practice, and have become part of the building and electrical codes.We are all familiar with the cables that were used to wire our houses in the common 120-240-volt single-phase electrical system. For ordinary 120-volt circuits, each cable will have a white "neutral" wire, grounded at the s...

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