The NEC is used in conjunction with local, country, and State codes that strictly control electrical wiring. The codes are concerned with proper size of wire and with insulation. Factors that are considered are the expected load, the frequency of modifications, and the nature of the environment where the wire is used. Homes have small loads, infrequent modifications and a very non-corrosive environment. Commercial establishments are usually in the middle. The load demands are sometimes higher, and modifications are not infrequent. The factory or industrial site has a very high demand. Modifications are frequent, and the environment is often highly unstable.
After electricity is produced at power plants is has to get to the customers that usethe electricity. Our cities, towns, states and the entire country are crisis-crossed withpower lines that ³carry´ the electricity. As large generators spin, they produce electricitywith a voltage of about 25,000 volts. A volt is a measurement of electromotive force inelectricity. The electricity first goes to a transformer at the power plant that boosts thevoltage up to 400,000 volts. When electricity travels long distances it is better to have itat higher voltages "more efficiently at high voltages".
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