Electricians are either inside wiremen or outside linemen. These are the main concentrations of a practicing electrical professional, but there are various areas of specialization within each category. Duties also vary widely with each type of position or specialization.
Electricians who fall into the inside wiremen category focus almost solely on the wiring of buildings. Structures range from a newly built home to an aged industrial building that's being repurposed for a new use. Inside wiremen, as their name implies, spend most of their careers working indoors. Working with blueprints, they install new electrical systems in new buildings and troubleshoot problems or replace older systems.
Outside linemen, by contrast, work outdoors most of their careers. They must exhibit a moderate amount of physical fitness due to the requirement of climbing telephone and power poles when a lift bucket is not available. Outside linemen must also endure inclement weather in order to repair power outages for all the homes, businesses and other structures in the area affected by the outage. These electricians work with transformers, transmission lines and traffic signals. They may also be required to trim trees or assemble electrical substations.
These main categories are subdivided into several areas. Service electricians, for instance, specialize in troubleshooting wiring problems and making repairs. Construction electricians, in contrast, focus on laying wiring for new buildings and rarely perform maintenance. Electricians also specialize in marine, air, research, and hospital-specific applications.