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.
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.
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