For the assigned group of station control equipment, to the extent of the possibility of preventing costly damage that would result in the case of faulty operating sequence, as well as the responsibility for detecting incipient damage to equipment, but this responsibility is considerably limited by the extent of protective relays and other automatic devices installed. Electrical work includes items such as generators, voltage regulator rheostats, exciters, buses and bus duct, transformers, circuit breakers, switches, power circuits, magnetic contactors, motors, motor starters, batteries, plant lighting, conduit, wiring, boxes, supports, and hangers.