Modifies, redesigns, and installs electrical power systems, power supplies, converters, generators, timing and synchronizing devices, photoelectric cells, filters, governors, step controllers, electronic programmers, relays, transformers, and voltage regulators, to meet the needs of the customer, which may be foreign made equipment of different frequencies and/or voltages other than those of American design. Services and troubleshoots various types of servo systems; mechanical, electrical and electronic devices and control systems; installs, repairs, and maintains overhead and underground electrical feeders, control, instrumentation, and communications cabling from very low control voltages to 480 volts.