Repair, maintain, or install electric motors, wiring, or switches.

Install, inspect, test, adjust, or repair avionics equipment, such as radar, radio, navigation, and missile control systems in aircraft or space vehicles.

Install, set up, rearrange, or remove switching, distribution, routing, and dialing equipment used in central offices or headends. They service or repair telephone, cable television, internet, and other communications equipment on customers' property. They install communications equipment or communications wiring in buildings.

Test or repair mobile or stationary radio transmitting and receiving equipment and two way radio communications systems used in ship to shore communications and found in service and emergency vehicles.

Repair, install or maintain mobile or stationary radio transmitting, broadcasting, and receiving equipment, and two way radio communications systems used in cellular telecommunications, mobile broadband, ship to shore, aircraft to ground communications, and radio equipment in service and emergency vehicles. They test and analyze network coverage.

Repair, maintain, or install computers, word processing systems, automated teller machines, and electronic office machines, such as duplicating and fax machines.

Lay, repair, and maintain track for standard or narrow gauge railroad equipment used in regular railroad service or in plant yards, quarries, sand and gravel pits, and mines. Includes ballast cleaning machine operators and railroad bed tamping machine operators.

Assemble, install, repair, or maintain electric or hydraulic shipment or passenger elevators, escalators, or dumbwaiters.

Install, maintain, and repair electrical wiring, equipment, and fixtures. They ensure that work is in accordance with relevant codes. They install or service street lights, intercom systems, or electrical control systems.

Build, install, test, or maintain robotic equipment or related automated production systems.