When the electrical system in your home works normally, you may rarely think about your electrical panel. However, it contains numerous components that are vital to your home’s appliances, lights and other electrical fixtures. You can protect your electrical system better by understanding what’s inside your home’s electrical panel.

Main Breaker Circuit

The main breaker circuit is a key component in your home’s electrical panel. It functions as the master switch, shutting off power to the rest of the panel during routine maintenance, repairs or electrical emergencies.

Circuit Breakers

The electrical panel in your home also contains circuit breakers. These components protect individual circuits connected to fixtures, like your light switches and appliances.

They cut off power during overloads or short circuits. When they detect a fault, they’ll shut off automatically. Each circuit should have its own label indicating what it connects to in the breaker box.

Bus Bars

You will additionally find bus bars in an electrical panel. These bars are conductive strips, typically made from aluminum or copper. They distribute electricity to the individual breakers from the main breaker. They also simplify wiring, acting as a central hub to reduce clutter and improve organization in the breaker box.

For example, the neutral bus bar in the panel connects all of the circuits’ neutral wiring and completes the electrical return path. The grounding bus bar connects to the ground rods or another grounding system, which allows it to discharge stray electricity.

Service Entrance Cable

The service entrance cable is the primary electrical cable that delivers power to your home from your electrical provider or the building’s electrical system. It serves as the lifeline that connects your home’s electrical panel to an outside power source. It’s capable of handling high voltages up to 600 volts and can tolerate both indoor and outdoor environments.

There are two types of service entrance cables found in breaker boxes today: SER and SEU. SER cables are round and have multiple ground and neutral conductors. SEU cables are flat and only have phase and neutral conductors and no ground conductors.

Terminal Blocks

Terminal blocks create secure connection points for electrical wiring and are common in complex electrical panels. They connect two or more electrical wires and consist of a metal conductor housed in an insulated frame.

The different types of terminal blocks found in most electrical panels today include:

• Screw-in
• Spring-loaded
• Ground terminal
• Fused terminal

Your panel may also have a multi-level terminal block that creates multiple connections in a compact space.

Disconnects

The disconnect in an electrical panel is an optional switch that isolates power to high-load appliances. It typically connects to fixtures like HVAC units and ovens. These components comprise the typical electrical panel.

Contact Town & Country Electric if you need any electrical panel upgrades in Billings, MT.