Construction and residential electricians work in all phases of the electrical construction and service industry. They do the electrical construction work on projects ranging from single-family residences to state-of-the-art industrial plants. Workers install conduits and wire all lighting, along with switches and converters, to complex systems incorporating computerization and high technology in the installation and maintenance of electrical systems. Their work includes both small and large commercial installation up to and including high-rise buildings. Electricians also do repair and maintenance on all electrical installations. The low voltage/sound and communication apprenticeship includes work processes in fiber optics, telephone systems, sound and fire alarm systems, LAN and structured wiring systems.