Electrical Panel Upgrade | Tampa Bay

A house built in 1965 was wired for a fraction of what a modern household draws. Central air conditioning, an electric range and dryer, a tankless water heater and an EV charger together can exceed the original service capacity several times over. The symptom is usually a breaker that trips under load, but the actual issue is that the service was sized for a different era.

Two panel brands in particular are worth knowing about. Federal Pacific Stab-Lok and Zinsco panels have failure histories serious enough that many electricians and inspectors treat them as a defect regardless of how they currently perform. If either is in your home, replacement is worth considering on its own merits.

How to tell the service is too small

Breakers that trip when several appliances run together, lights that dim noticeably when the air conditioning starts, a service panel with no space for another breaker, or a 60 or 100 amp main where the house now has modern loads. Any of those indicates the service is at or past its limit. A load calculation establishes what the house actually requires rather than estimating from square footage.

What the upgrade involves

Replacing a panel is not simply swapping a box. The utility has to disconnect and reconnect the service, which means coordinating with them for a window without power. The new panel is installed, circuits are transferred and labelled, grounding and bonding are brought up to current code, and the installation is inspected before the utility restores supply. Expect a day without power for a straightforward change.

What else typically gets corrected

Opening the panel is when other problems become visible. Missing or inadequate grounding and bonding, double-tapped breakers, undersized conductors, aluminium branch wiring, and circuits that were extended repeatedly without a permit. Addressing those during the panel change is far cheaper than returning later, and some of them are genuine safety issues rather than code technicalities.

When to call

Breakers trip when appliances run together
Lights dim when the air conditioning starts
You need to add a circuit and the panel is full
You have a Federal Pacific or Zinsco panel
Your home still has a fuse box rather than breakers
You are adding an EV charger, generator or heat pump

How the work is handled

Load calculation to establish what the house actually needs
Assess existing grounding, bonding and branch circuit condition
Permit the service change and schedule the utility disconnect
Install the new panel, transfer and label every circuit
Inspection, then utility reconnect and supply restoration

What affects the cost

We do not quote a number before seeing the property, because the same job on two similar houses can need different work. These are the factors that move the scope:

Service size going in and the current size coming out
Whether the meter base and service entrance conductors change
Condition of the branch circuits being transferred
Grounding and bonding work required to meet current code
Utility coordination and any charge for the disconnect
Permit fees and inspection requirements

Frequently asked questions

How do I know if my panel needs replacing?

A 60 or 100 amp service in a house with modern loads, a full panel with no spare spaces, a fuse box, or a recalled Federal Pacific or Zinsco panel all point toward replacement. A load calculation settles it properly rather than relying on guesswork.

Are Federal Pacific panels actually dangerous?

They have a documented history of breakers failing to trip under fault conditions, which is the opposite of what a breaker exists to do. Many inspectors flag them as a defect regardless of current performance. Zinsco panels have a similar reputation. Replacement is the usual recommendation.

Will I lose power during the upgrade?

Yes, for most of a day on a straightforward change, since the utility has to disconnect and reconnect the service. We schedule it in advance and tell you exactly what to expect so you can plan around it.

Do I need a bigger service for an EV charger?

It depends on the service size and what else the house draws, which is what the load calculation determines. Sometimes there is capacity; sometimes the charger needs load management; sometimes the service has to grow. All three are workable, and the calculation decides which applies.

Related services

Electrical Service across Tampa Bay and Lakeland

The combination of older Tampa Bay housing stock and modern high-draw equipment means service capacity, not the wiring itself, is often the binding constraint. We work throughout Tampa, Brandon, Riverview, Valrico, Plant City, Lutz, Land O' Lakes, Wesley Chapel, Odessa, Zephyrhills, Lakeland.

What we see most often in this region

100 amp and 60 amp services in homes with modern appliance loads
Federal Pacific and Zinsco panels still in service across the region
Fuse boxes persisting in mid-century homes
Grounding and bonding that does not meet current code requirements