The Homeowner's Guide to Electrical Panels

Not all electrical panels are equal. The brand and age of your panel determines your risk profile.

Your electrical panel — also called the breaker box or load center — is the distribution point for every circuit in your home. Power comes in from the utility, passes through the main breaker, and distributes to individual circuit breakers that protect each circuit. When a circuit is overloaded, the breaker trips and cuts power. That's the fundamental safety mechanism the entire system depends on.

Standard breaker panels

Panels from manufacturers like Siemens, Square D, Eaton, and Leviton are the current standard. These are reliable products with well-documented performance histories. A standard panel in good condition with adequate capacity needs nothing except occasional inspection.

Federal Pacific Electric (FPE) Stab-Lok panels

A known safety hazard. Independent testing has demonstrated that FPE Stab-Lok breakers fail to trip under overload conditions at a significantly higher rate than standard breakers. A breaker that doesn't trip allows a circuit to overheat and potentially start a fire. FPE panels are identifiable by the orange breaker handles inside and the FPE or Stab-Lok label. If your home has one, replacement is strongly recommended.

Zinsco and GTE-Sylvania panels

Zinsco breakers are known to bond to the bus bar over time, meaning they cannot be removed or reset — a breaker that can't be removed can't be replaced when it fails. Like FPE, Zinsco panels should be replaced. They're identifiable by turquoise or teal colored breaker handles.

Fuse boxes

Fuse boxes predate circuit breakers. A home with a fuse box has an electrical system that predates modern safety standards. Fuse boxes themselves aren't inherently dangerous, but a home old enough to still have a fuse box likely has wiring that warrants professional evaluation.

What's inside your panel and what each component does.

The main breaker

The large double-pole breaker at the top of the panel. It controls all power entering the panel and is your first shutoff in an emergency. Know where it is and how to operate it before you need it.

Circuit breakers

The individual switches protecting each circuit. A tripped breaker is the system working as designed — find and fix the cause of the trip before resetting. A breaker that trips repeatedly on the same circuit indicates either an overloaded circuit or a fault in the wiring or a connected appliance.

The bus bars

The metal bars that breakers connect to. They carry the electrical load from the main breaker to the individual circuits. In Zinsco panels, breakers bond to the bus bar and cannot be removed — a failure that makes the panel unrepairable and creates serious fire risk.

AFCI and GFCI breakers

Safety devices required by modern code for specific circuits. AFCI breakers protect against electrical arcs — a leading cause of electrical fires. GFCI protection is required near water sources. Older homes often lack both. Adding AFCI and GFCI protection to circuits that lack it is one of the highest-value electrical upgrades available.

What happens to an electrical panel over time.

Electrical panel deterioration progression

What you can check yourself and when to call a licensed electrician.

Open the panel cover and visually inspect. Look for any signs of burn marks, scorching, or melted plastic — these indicate a past arc event. Look for corrosion on breakers or bus bars. Check that breakers are seated firmly. Feel the panel cover (not the breakers directly) — it should not be warm to the touch.

Check your breaker brand

Orange handles inside — Federal Pacific. Turquoise or teal breakers — likely Zinsco. Label reading Stab-Lok — Federal Pacific. Any of these warrants a call to a licensed electrician for a replacement evaluation.

What requires a licensed electrician

Any work inside the panel beyond visual inspection requires a licensed electrician in virtually all jurisdictions. This includes adding circuits, replacing breakers, and any panel repair or replacement. Do not attempt to work inside an energized panel.

What a licensed electrician should look like and how to avoid unnecessary panel replacement.

Electrical work requires a licensed electrician in virtually every jurisdiction. At minimum you want someone who holds a state electrical contractor license — not a handyman or general contractor offering electrical work on the side. Verify the license through your state's contractor licensing database before booking.

The permit requirement

Panel replacements require a permit in every jurisdiction. An electrician who proposes doing a panel replacement without pulling a permit is not operating legally. Permitted panel work is inspected by your local building department — the independent verification that the work was done correctly. Do not skip this step.