Electricity can be an intimidating concept for many because of the potential danger. You can virtually eliminate that danger with a little knowledge and proper safety practices. However, regardless of how much knowledge you have, never become lax in dealing with an electrical system, or it can be deadly. This meant to give you an understanding of several common electrical situations that you might encounter. Because of the many options and variations in this area, it is not intended to be a complete guide to electrical work. Never take chances with electrical work. Electrical wiring in general refers to insulated conductors used to carry electricity, and associated devices. This article describes general aspects of electrical wiring as used to provide power in buildings and structures, commonly referred to as building wiring. This article is intended to describe common features of electrical wiring that may apply worldwide. For information regarding specific national electrical codes, refer to the articles mentioned in the next section. Separate articles cover long-distance electric power transmission and electric power distribution.
Wiring systems in a single family home or duplex, for example, are simple, with relatively low power requirements, infrequent changes to the building structure and layout, usually with dry, moderate temperature, and non-corrosive environmental conditions. In a light commercial environment, more frequent wiring changes can be expected, large apparatus may be installed, and special conditions of heat or moisture may apply. Heavy industries have more demanding wiring requirements, such as very large currents and higher voltages, frequent changes of equipment layout, corrosive, or wet or explosive atmospheres. In facilities that handle flammable gases or liquids, special rules may govern the installation and wiring of electrical equipment in hazardous areas.
The first interior power wiring systems used conductors that...
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