Examines and tests such elements of systems as distribution panels, controls, circuit fixtures, appliances, transformers, ground fault detectors, static ground detectors, line isolation monitors and motors, to locate obvious faults such as blown fuses, shorts, circuits, broken wires, loose connections, worn-out parts and motor brushes. Isolates defects in wiring, switches, motors and other electrical equipment, using test instruments such as ammeter, ohmmeter, voltmeter, testing lamps, multi-tester, megger, current voltage recorders, polarity testers, light meters, electronic stethoscope and wattmeter.