Last Updated on 15 July 2025 by Maelle
The electrical panel, or “breaker box,” is the heart and soul of your home’s electrical system. It connects to the utility company’s power lines and supplies power to all the various circuits in your home. The panel also houses the system’s main safety devices—the circuit breakers—which protect each circuit from overloads and other hazards.
An electrical panel is a surprisingly simple system that can nevertheless be compromised by a number of problems, ranging from faulty installation to weather and sunlight, to simple obsolescence. All service panel problems should be diagnosed and resolved by a qualified electrician, but here are some common reasons why you might need to repair or replace a panel or one of its parts. Damaged service cables The cables running from the utility pole to the structural support of your home are the responsibility of the electric company. The cable bundle between the support and the panel (called the SEC, for service-entrance cable) is your responsibility. Problems can include worn or damaged insulation, loose cable, damaged or missing cable ties, or anchors where the SEC meets the meter or service panel. All of these conditions require immediate repair.
Excessive moisture
Water and electricity are as deadly a duo as fire and gasoline. If a water leak or drainage problem causes water to enter or near your panel, stay away from the panel and call a professional for assistance. The presence of water or excess moisture inside the panel can manifest itself as rust stains on the casing or white, chalky corrosion on the wiring and other metal parts. Water-damaged panels often need to be replaced.
Improper Wiring
Faulty or careless installation can lead to a number of problems that must be repaired in electrical cabinets. The most common hazards are oversized breakers (for example, a 20-amp breaker on a 15-amp circuit), two double-circuits on a single-pole breaker (a code-breaking effort to save space), double-pole breakers feeding two single circuits, and wires that crisscross in the center of the panel. These problems can pose serious risks but are relatively easy to resolve.
Faulty Manufacturing
Over the years, a few electrical equipment manufacturers have created problems in homes with their panels. Problems related to faulty panels include breakers that don’t trip when they should, breakers that fall out or are easily damaged, and improper installation due to non-standard design (and the installing electrician’s lack of familiarity with the products). If an electrician or home inspector tells you that your electrical panel is on the “must-replace” list, they probably aren’t interested in job safety. But get a second opinion before making a decision. Underpowered or overloaded panelEach electrical panel has limited space for breakers and a maximum power rating (in amps). Older fuse panels typically offered 60 amps, followed by standard 100-amp breaker panels. Today, 200-amp panels are recommended for most new construction and renovations. If your expansion or renovation project requires adding new circuits, you may need to upgrade to a larger panel. The modest additional expense of upgrading to a 200-amp panel, rather than a 150-amp model, is worth it, lest you run out of space or power in the future.
If you’re considering repairing or replacing your electrical panel, remember that the final word on home wiring is the local electrical code. You can learn more from your city’s building department or an experienced local electrician who knows the rules in your area.
