High voltage transmission lines carry electricity long distances to asubstation. From this substation, electricity in different power levels is used to runfactories, streetcars and mass transit, light street lights and stop light, and is sent toneighborhood. When electricity enters "example house", it must pass through a meter andgoes through a fuse box. The fuse box protects the house in case of problems. When afuse "circuit breaker" ³blows´ or ³trips´ something wrong with an appliance or somethingwas short circuited.
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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