An electrician is a tradesman specializing in electrical wiring of buildings, stationary machines and related equipment. Electricians may be employed in the installation of new electrical components or the maintenance and repair of existing electrical infrastructure. Electricians may also specialize in wiring ships, airplanes and other mobile platforms. In the film industry and on a television crew the Electrician is referred to as a Gaffer.
"Electrician" and "electrical contractor" are related terms. An electrician is an individual tradesperson; an electrical contractor is a business that employs electricians to design, install, and maintain electrical systems. In most of the United States, separate licensing requirements exist for electricians and electrical contractors. Electricians are typically not allowed to perform work for the public unless under the employment of an electrical contractor.