Many electricians specialize in either construction or maintenance work, although some work in both fields. Electricians in construction are usually employed by electrical contractors. Other construction electricians work for building contractors or industrial plants, public utilities, state highway commissions, or other large organizations that employ workers directly to build or remodel their properties. Many are self-employed.

When installing electrical systems, electricians may follow blueprints and specifications or they may be told verbally what is needed. They may prepare sketches showing the intended location of wiring and equipment. Once the plan is clear, they measure, cut, assemble, and install plastic-covered wire or electrical conduit, which is a tube or channel through which heavier grades of electrical wire or cable are run. They strip insulation from wires, splice, and solder wires together, and tape or cap the ends. They attach cables and wiring to the incoming electrical service and to various fixtures and machines that use electricity. They install switches, circuit breakers, relays, transformers, grounding leads, signal devices, and other electrical components. After the installation is complete, construction electricians test circuits for continuity and safety, adjusting the setup as needed.

Maintenance electricians do many of the same kinds of tasks, but their activities are usually aimed at preventing trouble before it occurs. They periodically inspect equipment and carry out routine service procedures, often according to a predetermined schedule. They repair or replace worn or defective parts and keep management informed about the reliability of the electrical systems. If any breakdowns occur, maintenance electricians return the equipment to full functioning as soon as possible so that the expense and inconvenience are minimal.

Maintenance electricians, also known as electrical repairers, may work in large factories, office buildings, small plants, or wherever existing electrical facilities and machinery need regular servicing to keep them in good working order. Many maintenance electricians work in manufacturing industries, such as those that produce automobiles, aircraft, ships, steel, chemicals, and industrial machinery. Some are employed by hospitals, municipalities, housing complexes, or shopping centers to do maintenance, repair, and sometimes installation work. Some work for or operate businesses that contract to repair and update wiring in residences and commercial buildings.

A growing number of electricians are involved in activities other than constructing and maintaining electrical systems in buildings. Many are employed to install computer wiring and equipment, telephone wiring, or the coaxial and fiber optics cables used in telecommunications and computer equipment. Electricians also work in power plants, where electric power is generated; in machine shops, where electric motors are repaired and rebuilt; aboard ships, fixing communications and navigation systems; at locations that need large lighting and power installations, such as airports and mines; and in numerous other settings.

All electricians must work in conformity with the National Electrical Code as well as any current state and local building and electrical codes. (Electrical codes are standards that electrical systems must meet to ensure safe, reliable functioning.) In doing their work, electricians try to use materials efficiently, to plan for future access to the area for service and maintenance on the system, and to avoid hazardous and unsightly wiring arrangements, making their work as neat and orderly as possible.

Electricians use a variety of equipment ranging from simple hand tools such as screwdrivers, pliers, wrenches, and hacksaws to power tools such as drills, hydraulic benders for metal conduit, and electric soldering guns. They also use testing devices such as oscilloscopes, ammeters, and test lamps. Construction electricians often supply their own hand tools. Experienced workers may have hundreds of dollars invested in tools.

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