Reads, interprets, and executes drawings, schematics, blueprints, and electrical code specifications to see layout of commercial electrical equipment installations. Tests electrical and equipment and parts for continuity, current, voltage, and resistance. Installs, repairs, or replaces AC/DC motors and drives, transformers, motors, starters, relays, and hydraulic and gas electrical controls. Installs repairs, or replaces electrical wiring, receptacles, switch boxes.