What your electrical panel actually does
Your panel receives power from the utility and distributes it across individual circuits throughout your home. Each breaker protects one circuit — when a circuit is overloaded or develops a fault, the breaker trips to prevent damage or fire.
Most homes built before 1990 have panels rated at 100 amps. Modern households — with EV chargers, air conditioners, electric ranges, and home offices — often need 150 or 200 amps to operate safely without constantly pushing the panel to its limit.
Warning signs your panel needs attention
- Breakers trip repeatedly under normal use. A breaker that trips when you run the microwave and the dishwasher at the same time isn't necessarily a faulty breaker — it may be a circuit that's been undersized for how the home is actually used.
- The panel is full. No available slots means no new circuits. If you're planning a remodel, adding an EV charger, or upgrading an appliance, a full panel blocks you.
- Breakers won't reset or feel loose. A breaker that trips and won't hold reset, or one that feels physically loose in the panel, may have internal wear that compromises the protection it's supposed to provide.
- The panel or breakers feel warm. Panels should not feel noticeably warm to the touch. Warmth near breakers or the main disconnect suggests a connection or load issue worth inspecting.
- A home inspector flagged the panel. This is one of the most common reasons homeowners call — inspectors flag older panels for known equipment issues, capacity concerns, or signs of prior amateur wiring.
- Visible corrosion, scorching, or a burning smell. Any visible burn marks or persistent smell near the panel is a safety issue that should not wait.
Outdated panel equipment that typically needs replacement
Certain brands and types of panels have known reliability or safety issues and are commonly flagged by home inspectors:
- Fuse boxes. Original fuse-style panels are functional but can't support modern loads, have no room for additional circuits, and are difficult to insure. Most lenders and insurers require replacement.
- Federal Pacific Electric (FPE) and Zinsco panels. These brands have documented issues with breakers failing to trip under overload conditions. They were common in homes built between the 1950s and 1980s. If your panel is either of these, have it evaluated.
- Split-bus panels. Older panels without a single main breaker require multiple breakers to shut off the panel completely. Many are now past the end of their useful service life.
What panel replacement actually involves
A panel replacement typically means removing the existing panel, installing a new one rated for the home's current and near-term load, transferring circuits, and having the work permitted and inspected through the Tennessee state electrical program.
In most cases, the work takes one day. Power is off during the swap. A licensed electrician will also review your existing circuits and flag anything that needs attention before the new panel goes in.
What the Tennessee permit process looks like
- Permit pulled through the state program before work starts.
- Panel installed to current code requirements.
- Inspection by a licensed deputy electrical inspector.
- Documentation you can show future buyers or your insurer.
When to call vs. when to wait
If your panel is tripping frequently, full, or showing any of the physical warning signs above — it's worth a professional evaluation before it becomes an emergency. A good electrician will tell you honestly whether replacement is necessary or whether smaller fixes address the issue.
If you're buying or selling a home and a panel concern came up in the inspection, getting a second opinion from a licensed electrician before negotiating repairs is always a reasonable step.
Panel work in La Vergne and nearby Middle Tennessee