Federal Pacific and Zinsco panels in Charlotte homes: what to do

If your house was built between the 1950s and the 1980s, there is a fair chance its breaker panel was made by Federal Pacific Electric or Zinsco. Both brands were common, both are long out of production, and both have breakers that can fail to trip when they should. Here is how to tell what you have and what to do about it.

How to identify the panel

• Federal Pacific: look for 'FPE' or 'Federal Pacific Electric' on the door and 'Stab-Lok' on the label inside. The breakers usually have a red strip across the handle.
• Zinsco: the name may read Zinsco, Sylvania, or GTE-Sylvania. The breakers are narrow with brightly colored handles, often red, blue, and green.
• If the label is missing, text us a photo of the open door. Do not remove the panel cover yourself.

What goes wrong

A breaker has one job: open the circuit when the wire is carrying more current than it safely can. Independent testing of Federal Pacific Stab-Lok breakers has found that a significant share of them do not trip under overload. The wire overheats and the breaker stays on.

Zinsco panels fail differently. The breakers clip onto aluminum bus bars, and over time the connection can overheat and fuse the breaker to the bus. A fused breaker may not trip, and sometimes it cannot be switched off or pulled out at all.

Neither panel announces the problem. A Stab-Lok breaker that has never tripped looks exactly like one that works. That is why electricians treat the brand itself as the finding.

What we recommend

• Do not add circuits or large loads, such as an EV charger or hot tub, to one of these panels.
• Do not rely on replacement breakers. Swapping breakers leaves the same bus design in place.
• Plan a panel replacement. It does not have to happen tonight, but it should be on the calendar.
• If you smell burning or see scorch marks at the panel, turn off the main and call the same day.

What a replacement involves

A like-for-like panel replacement keeps your existing service size and swaps the panel and breakers for a current make. If the house also needs more capacity, the panel change is the moment to move from 100 amps to 200. Either way the job needs a permit and an inspection through Mecklenburg County, and Duke Energy disconnects and reconnects the power. A typical residential swap means four to six hours without power.

The details, including how we size the new panel, are on our panel upgrades page. The permit side is covered in our Mecklenburg County permit guide.

Buying or selling a house with one

Home inspectors in Charlotte flag these panels routinely, and some insurers ask about them. If you are selling, replacing the panel before listing takes it off the negotiating table. If you are buying, a replacement quote in hand is a fair thing to bring to the seller.

Not sure what you have? Text a photo of the panel with the door open and we will tell you.