Performs specified electrical work; installs, repairs, or maintains transformers, generators, circuit breakers, conduits, and panels; tests electrical circuits; replaces units or parts including wiring, fuses, transformers, coils and switches. Thorough knowledge of and skill in basic mathematics including area, volume, weights, and the practical application of fractions, percentages, ratios, and proportions; of OSHA regulations related to the electrical trade; of electrical codes, Underwriters Rules for wiring and installation.