They also study math, electrical codes, safety practices, and first aid. Apprentices receive special training in welding and fire alarm systems. On the job, apprentices work with experienced electricians. At first they drill holes, set anchors, and set up conduit. Later they measure and install conduit as well as install, connect, and test wiring, outlets, and switches.
Apprentices also learn to set up and draw diagrams for entire electrical systems.
Apprenticeships are often sponsored by unions, electrical contractors' associations, or electrical contracting companies. Those who complete apprenticeships are qualified to do both maintenance and construction work. Electricians who learn the trade informally usually start as electricians' helpers. While learning to install conduit, connect wires, and test circuits, they learn safety practices. Many helpers also take correspondence courses or classes at trade schools.