Electricians install, repair, and maintain the wiring and equipment that brings power into buildings and keeps it running safely

An electrician's job is to work with electrical systems — the wires, panels, outlets, switches, and fixtures that distribute electricity throughout a home or building. They read blueprints, run cable through walls and ceilings, connect wiring to panels and devices, test systems to make sure they work, and fix problems when something stops working or becomes unsafe. The work requires understanding electrical code (the safety rules that vary by state and locality), knowing how to use specialized tools, and being able to troubleshoot when something goes wrong.

Electricians work on everything from new construction to renovation projects to emergency repairs. They might install a new circuit for a kitchen remodel, replace an old panel that no longer meets code, add outlets to a room, troubleshoot a breaker that keeps tripping, or diagnose why lights flicker. Some electricians specialize in residential work (homes and apartments), others in commercial buildings, and some in industrial facilities where the systems are far more complex.

Key Takeaways

  • Electricians must be licensed in most states and localities, and licensing requires apprenticeship hours, classroom work, and passing an exam.
  • Residential electricians handle wiring, outlets, panels, lighting, and appliance connections in homes; commercial electricians work on larger systems in office buildings and retail spaces.
  • Electrical work must follow the National Electrical Code and local amendments, which means not all work can be done by an unlicensed person.
  • You need a licensed electrician for new circuits, panel upgrades, and any work that requires a permit; some maintenance tasks like replacing outlets or light fixtures may be permitted for homeowners in some jurisdictions.

The difference between residential, commercial, and industrial electricians

Residential electricians work in homes and apartment buildings. Their tasks include running wiring through walls during construction, installing outlets and switches, connecting appliances like ranges and water heaters, upgrading panels when a home needs more power, and troubleshooting problems like outlets that don't work or breakers that trip repeatedly. The voltage is lower (typically 120/240 volts) and the systems are simpler than in larger buildings.

Commercial electricians work in office buildings, retail spaces, restaurants, warehouses, and other non-residential structures. They install and maintain larger wiring systems, three-phase power distribution, fire alarm systems, emergency lighting, and complex control systems. The voltage is higher, the code requirements are stricter, and the work often happens on a larger scale — running conduit through multiple floors, coordinating with other trades, and meeting tight schedules on active job sites.

Industrial electricians work in factories, power plants, and manufacturing facilities where electrical systems are the most complex. They maintain motors, generators, programmable controllers, and machinery that requires precise electrical work. This specialization typically requires additional training beyond the standard electrician license.

What licensing requires and why it matters

Most states and localities require electricians to be licensed, which means they have completed a formal apprenticeship, attended classroom instruction, and passed an exam that tests their knowledge of electrical code and safety. The apprenticeship typically takes four to five years and combines on-the-job training with classroom hours — the exact requirement varies by state. An apprentice works under a licensed electrician and gradually takes on more complex tasks as they gain experience.

Licensing exists because electrical work can cause fires, electrocution, and property damage if done incorrectly. The license means the electrician has demonstrated they know how to follow code, use proper materials, and work safely. When you hire a licensed electrician, you also have recourse if something goes wrong — you can file a complaint with the state licensing board, and the electrician carries liability insurance.

Some states allow homeowners to do electrical work on their own property without a license, but the work still must pass inspection and meet code. Hiring an unlicensed electrician for work that requires a permit is illegal in most places and can void your homeowner's insurance if something goes wrong.

Common tasks electricians handle

New construction and rough-in work: Electricians read the blueprint, run conduit and wire through walls and ceilings before drywall goes up, and install boxes for outlets and switches. This is called "rough-in" because the wiring is in place but not yet connected to devices.

Panel upgrades and new circuits: When a home needs more power — for an air conditioner, electric vehicle charger, or kitchen remodel — an electrician may need to upgrade the main panel or add new circuits. This work requires a permit and inspection because it affects the whole house's electrical capacity.

Outlet and switch installation: Once rough-in is complete, electricians connect wires to outlets, switches, and fixtures. They also install appliances that require hardwiring, like ranges, water heaters, and dishwashers.

Troubleshooting and repair: When something stops working — an outlet is dead, lights flicker, a breaker keeps tripping — an electrician diagnoses the problem. This might mean testing circuits with a multimeter, checking connections, replacing a faulty breaker, or identifying a short in the wiring.

Code compliance and inspection: Electricians know the National Electrical Code and local amendments. They make sure work meets code so it passes inspection and keeps the building safe.

When you need a licensed electrician versus when you can do it yourself

You need a licensed electrician for any work that requires a permit in your locality. This almost always includes new circuits, panel upgrades, hardwiring appliances, and any work that involves the main service entrance. Permit requirements exist because these tasks affect the safety of the whole electrical system.

Some jurisdictions allow homeowners to replace outlets, switches, and light fixtures without a permit, since this work is lower-risk and doesn't change the system's capacity. However, the work must still meet code — you cannot use undersized wire, improper connections, or unsafe practices just because you are doing it yourself. If you are unsure whether your project needs a permit, contact your local building department before you start.

Hiring a licensed electrician for permitted work protects you because the electrician carries insurance, the work is may provide to meet code, and you have a paper trail if something goes wrong. If an unlicensed person does the work and causes a fire or electrical hazard, your homeowner's insurance may deny a claim.

How electricians work with building codes and inspections

All electrical work must follow the National Electrical Code (NEC), which is a set of safety standards updated every three years. Most states adopt the current or recent version of the NEC and may add their own amendments. Local jurisdictions sometimes have additional rules based on climate, soil conditions, or local hazards.

When a permit is required, the work is inspected at different stages — typically after rough-in (wiring in place but not connected) and after final (all devices installed and system operational). The inspector checks that the work follows code, uses proper materials, and is safe. If something does not pass, the electrician must fix it and request a re-inspection.

Licensed electricians stay current on code changes because their license renewal often requires continuing education. This means they know what the current rules are and can advise you if an older system needs to be updated to meet today's standards.

What to expect when you hire an electrician

When you call an electrician for a job, they will usually schedule a time to visit and assess the work. For a repair, they will diagnose the problem and give you an estimate for the cost and time. For new work, they will discuss the scope, explain what permits are needed, and provide a written estimate before starting.

Licensed electricians carry liability insurance and typically provide a warranty on their work — usually one year for labor. They will also pull any required permits and schedule inspections. The cost varies widely depending on the complexity of the work, your location, and the electrician's experience level. Getting estimates from two or three electricians is normal practice.

After the work is complete, you should receive documentation — a copy of the permit, the inspection sign-off, and an invoice. Keep these records because they prove the work was done to code and can be important if you sell the home or file an insurance claim.

Frequently Asked Questions

Can I replace an outlet or light switch myself?

In many places, homeowners can replace outlets and switches without a permit, but the work must still follow code — you need to turn off power at the breaker, use the correct wire gauge, and make proper connections. If you are unsure how to do this safely, hire an electrician. One mistake can cause a fire or electrocution.

What is the difference between an electrician and an electrical contractor?

An electrician is a licensed individual who performs electrical work. An electrical contractor is a business that hires electricians and takes on projects. When you hire a contractor, you are contracting with the business, which is responsible for the work and the electricians' performance.

How do I know if an electrician is actually licensed?

Ask for their license number and verify it with your state's licensing board or department of labor. Most states have an online database where you can search by name or license number. A licensed electrician should have no problem providing this information.

Why does electrical work cost so much?

Licensed electricians have spent years in apprenticeship and continuing education, carry liability insurance, and are responsible for code compliance and safety. The cost reflects their informed and the liability they assume. Unlicensed work may seem cheaper upfront but can cost far more if it causes damage or fails inspection.

What should I do if an electrician's work fails inspection?

The electrician is responsible for fixing it and paying for the re-inspection. This is why hiring a licensed, insured electrician matters — they have the resources and obligation to make it right. If you hired an unlicensed person, you may have no recourse.