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Is copper wire 100 percent copper? Very few things are 100% You can find copper wire with 99.999% purity commercially. The purity of copper is expressed as 4N for 99.99% pure or 7N for 99.99999% pure. The nâ¦umeral gives the number of nines after the decimal point when expressed as a decimal (e.g. 4N means 0.9999, or 99.99%). Much electrical wiring is not more than 99,9% copper.
Electrical wires have markings stamped or printed on the outside sheath of the cable. And although these markings tell you what type and size of wire you have, the color of the wires will reveal that different color wires serve different purposes. The most common wire color code is black.Black wires are always used for hot wires and may feed a switch or outlet. Most important, Black Wires are never used as a Neutral or Ground connection. Red wires are also used for hot wires or switch legs.nd although these markings tell you what type and size of wire you have, the color of the wires will reveal that different color wires serve different purposes. The most common wire color code is black.