Electricians work throughout the construction industry, providing electrical services in residential, commercial, and industrial construction projects. Electricians install new wiring and related components, such as breaker boxes, switches, light fixtures, and even telephone and television wiring. Some Electricians also install motors and air conditioning or heating systems. They perform maintenance and repairs, replacing defective parts as problems occur and repairing equipment when it fails. Electricians have one of the highest employment rates of all craft workers.