Assists with the installation, maintenance, troubleshooting, and repair of electrical wiring systems, fixtures, controls, and a wide spectrum of equipment, including motors, appliances, fans, rooftop units, wiring conduits, breaker panels, light ballasts, pumps, control systems, disconnect switches, fuses, HVAC electrical systems, water heaters, fire alarms, and other alarm systems. Assists with the installation, maintenance, troubleshooting, and repair of heating, ventilating, and air conditioning (HVAC) equipment including chillers, boilers, air handlers, control systems, cooling towers, heat exchangers, heat pumps, distribution boxes, thermostats, pumps, and air compressors.