Applicant must be able to read and interpret instruction sheets, blueprints and wiring diagrams; analyzing defects in substations, load centers, motor control center, batteries and charging systems, rectifiers and transformers and determine the extent of required repairs; setting up and conducting tests; making repairs, replacements and adjustments with a minimum of direct supervision; observing and reporting of unsafe conditions; fully understand the principles of and the safety precautions regarding work on 23,000 volts and 480 volt A.C. and 650 volt D.C. power systems; understand and be proficient in use of test equipment, including but not limited to ammeters, voltmeters and preventative maintenance on substation and other electrical equipment; to be able to make emergency repairs. • Test, repair and replace power distribution systems or components, included but not limited to high-voltage solid state rectifiers, transformers, circuit breakers, insulators, and switchgear; remotely located power control equipment; constant and variable tension catenary suspension systems; feeder cable; and substation batteries and charging systems.