Assembles, install, test, and maintain electrical or electronic wiring, equipment, appliances, apparatus, and fixtures, using hand tools and power tools such as power construction equipment, measuring devices, power tools, and testing equipment including oscilloscopes, ammeters, and test lamps. Essential Functions: Tests electrical systems and continuity of circuits in electrical wiring, equipment, and fixtures, using testing devices such as ohmmeters, voltmeters, and oscilloscopes, to ensure compatibility and safety of system.