Install or repair cables or wires used in electrical power or distribution systems. They erect poles and light or heavy duty transmission towers.

Repair, adjust, or install all types of electric or gas household appliances, such as refrigerators, washers, dryers, and ovens.

Install and repair industrial and commercial refrigerating systems.

Supervise and coordinate activities of crew engaged in operating and maintaining engines, boilers, deck machinery, and electrical, sanitary, and refrigeration equipment aboard ship.

Operate or maintain stationary engines, boilers, or other mechanical equipment to provide utilities for buildings or industrial processes. They operate equipment, such as steam engines, generators, motors, turbines, and steam boilers.

Install, service, or repair heating and air conditioning systems in residences or commercial establishments.

Diagnose, inspect, adjust, repair, or overhaul recreational vehicles including travel trailers. They specialize in maintaining gas, electrical, hydraulic, plumbing, or chassis/towing systems as well as repairing generators, appliances, and interior components. Includes workers who perform customized van conversions.

Diagnose, adjust, repair, or overhaul small engines used to power lawn mowers, chain saws, recreational sporting equipment and related equipment.

Diagnose, adjust, repair, or overhaul motorcycles, scooters, mopeds, dirt bikes, or similar motorized vehicles.

Repair and adjust electrical and mechanical equipment of boat engines.