Install, modify, repair, maintain, troubleshoot, test, and load new and existing electrical lines, circuits, systems, and associated fixtures, controls, and equipment. Installs and repairs electrical systems, apparatus, and electrical and electronic components of machinery and equipment, following electrical code, manuals, schematic diagrams, blueprints, and other specifications, using hand tools, power tools, and electrical and electronic test equipment. Qualifications. Knowledge of the operation and installation of a variety of complete electrical systems and equipment. Strong knowledge and understanding about how various circuits, equipment, and controls operate, fit, and work together. Must have a knowledge of the various gauges, sizes, and types of wire, conduit, couplings, fittings, relays, boxes, circuit breakers, and other electrical devices, and the ability to arrange and install them in ways that insure proper and safe operation of electrical systems and equipment. Ability to interpret and apply the National Electrical Code, local codes, building plans, blueprints, wiring diagrams, and engineering drawings, and to use trade formulas to calculate common properties, e.g., voltage, voltage drop and current capability in series and parallel circuits, resistance, inductance, capacitance, power factor, current flow, and temperature, and length in single and multiple raceways, conduits, gutters, and cable trays. Must have skill in the use of hand tools and power tools and a wide variety of test equipment