Using advanced trades mathematics together with complicated drawings, specifications, charts, tables, handbook formulas, and all varieties of precision measuring instruments, and/or using computer controlled equipment, multi-machine work stations, and specific computer software application programs of a technical nature involving technical skills knowledge plus the application of basic theory. ESSENTIAL FUNCTIONS: Performs a variety of electrical work such as installation, repair, alteration and maintenance of complex electrical equipment (such as property lighting, automatic controls, emergency generators, switchboards, transfer switches, lighting systems, fire alarms and smoke detection systems).