An electrical service panel is one of the most important parts of your home’s electrical system. It receives electricity from the utility supply and distributes it to different circuits throughout your home.

You may also hear an electrical service panel called a breaker panel, electrical panel, circuit breaker panel, or breaker box.

Understanding how your service panel works can help you recognize electrical problems, understand why a circuit breaker trips, and know when it is time to call a qualified electrician.

What is an Electrical Service Panel?

An electrical service panel is the central distribution point for electricity in a home.

Electricity enters the property through the utility service and reaches the electrical service panel. From there, the panel distributes electricity through individual circuits that supply outlets, lights, appliances, HVAC equipment and other electrical loads.

The panel also contains protective devices such as circuit breakers. When a circuit experiences an overload or certain types of electrical faults, the appropriate breaker can interrupt the flow of electricity to help protect the circuit.

The service panel is therefore responsible for two important functions:

  • Distributing electricity throughout the home
  • Providing circuit protection

ESFI describes the electrical service panel as the central distribution point for electricity to switches, outlets and appliances throughout the home.

Where to Find the Electrical Service Panel?

The home electrical panel is generally kept away from the main household activities. These locations may include the garage, hallway leading to the garage, basement, and closet.

You can find your electrical service panel by locating the service drop and service head on your roof. Usually, the service panel should be directly below, in one of the home’s stories. If the power lines are buried, the line will usually start on the street and connect to the home from the front or side of the house.

Types of Electrical Panels

  1. Main Breaker Panel

    The main breaker panel controls the electricity that reaches the different rooms of your house. It can be used to cut the power to your house including the circuit breaker. They are classified based on the number of circuits they can handle and their amperage.

  2. Fuse Boxes

    These are designed to prevent circuit overload. Fuse boxes consist of small fuses that can fit into an electrical panel. The fuse will short out when there is an excess flow of current.

  3. Main Lug Panel

    Main lug panels use lugs and the line wires run into these lugs. They feature the main breaker as the separate disconnect at the meter. You can connect the main lug panel to the breaker at the main panel where the main lug panel operates as a sub-panel.

  4. Sub Panel

    These are perfect for homes where you require multiple circuits in the same area. The sub-panels get their power from the main panel through a circuit. They don’t have dedicated disconnects and they allow you to adjust the current distribution throughout the house.

  5. Transfer Switches

    These are suited for circuits where a backup power generator is used. It works by transferring the generator power to the electrical power through the panel. There are two types of transfer switches – manual and automatic.

Electrical Service Panel Safety Considerations

  • Under normal conditions, it is safe to touch the service panel when the panel’s outer door is closed.
  • Never work on an open electrical service panel when the door and protective front cover are removed. If you get a shock from the service lug, it will most definitely be a fatal one. Avoid touching the wires that enter the panel from the top of the box.
  • It would be a mistake to think that shutting off the panel’s main circuit breaker switch and removing the protective cover will keep you safe. The main breaker cuts off the power going to the home branch’s circuits. However, it doesn’t shut off the power coming into the panel on the utility service lines.
  • Apart from being cautious of what areas of the service panel your hands touch, be careful with handling tools as well. Tools can potentially touch the service wires and transmit a shock to you.

How Often to Inspect an Electrical Service Panel?

Get the electrical panel and circuit breaker box inspected once a year to ensure that the safeguards are working properly. This will ensure that the breakers are keeping you safe.

You need to inspect for loose connections, heating within the panel or signs of aging. Identify signs that can lead to a possible electrical fire. Call a professional to get the electrical panel checked out.

Never compromise on electrical safety. Call a qualified electrician if you want to get any work done.

FAQs:

What is the difference between a breaker box and an electrical panel?

In residential settings, breaker box, breaker panel, electrical panel and service panel are often used to describe the equipment that distributes electricity through the home’s circuits. The exact terminology can vary depending on the electrical system and context.

How do I know if my electrical panel is overloaded?

Frequent breaker trips, flickering lights, overheating, unusual odors and heavy reliance on extension cords can be warning signs of electrical problems or inadequate capacity. A qualified electrician should determine whether the system is actually overloaded.

Is a 200-amp panel better than a 100-amp panel?

Not necessarily. A higher-capacity service may be appropriate for a home with greater electrical demand, but the correct capacity depends on the home’s electrical load and applicable requirements.

Can I replace a circuit breaker myself?

Replacing a circuit breaker involves working inside electrical equipment and can expose you to dangerous electrical current. It should be performed by a qualified electrician.