If you look, you will also find a series of letters on a wire. These labels are also standard and will tell you more information about the makeup of the wire. For instance, the code may tell you whether it's aluminum or copper or whether or not it is heat resistant. As you learn more about wiring, you'll realize just how often you need to know these things.
Electricity distribution is the penultimate stage in the delivery (before retail) of electricityto end users. It is generally considered to include medium-voltage "less than 50 kV"power lines, electrical substations and pole mounted transformers, low voltage"less than 1000 V" distribution wiring and sometimes electricity meters.
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