An electrical expert is a tradesperson specializing in electrical circuitry of buildings, transmission lines, stationary machines, and associated equipment. Electrical experts may be employed in the installation of brand-new electrical components or the repair and maintenance of existing electrical infrastructure. Electrical experts may also focus on electrical wiring ships, planes, and other mobile platforms, along with data and cable television lines.

In the United States, electricians are divided into 2 main categories: linemen, who deal with electrical utility company distribution systems at greater voltages, and wiremen, who work with the lower voltages used inside structures. Wiremen are usually trained in one of 5 main specializeds: business, property, light industrial, industrial, and low-voltage wiring, more typically called Voice-Data-Video, or VDV.

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