If your home was built between the 1950s and 1980s, open your electrical panel door and read the brand name on the label. If it says Federal Pacific Electric (FPE Stab-Lok) or Zinsco (later GTE-Sylvania), keep reading — home inspectors, insurance companies, and real estate agents all pay special attention to these two brands.
What is the concern? The U.S. Consumer Product Safety Commission (CPSC) investigated FPE Stab-Lok breakers and closed its investigation in 1983 without making a safety determination. However, independent laboratory testing confirmed that some FPE breakers failed to trip under certain UL calibration test conditions. A breaker that doesn't trip when it should is a fire risk — that is the core of the concern.
Zinsco panels have a different known issue: the connection between the breaker and the bus bar can loosen over time, causing arcing and heat damage.
What does this mean for you in practice?
- Insurance: some insurers charge higher premiums for homes with these panels, or require replacement as a condition of coverage.
- Selling your home: buyers' inspectors routinely flag FPE and Zinsco panels, which can delay or complicate escrow.
- Safety: whether your specific panel needs replacement depends on its model, condition, load, and local requirements — there is no one-size-fits-all answer.
What to do: Check the brand name on your panel (just open the door and read the label — do not remove the inner cover yourself; that's live electrical work). If it's FPE or Zinsco, have a licensed electrician assess it. In many cases the practical fix is a panel upgrade, which also brings your service up to modern capacity.
Have one of these panels? Send us a photo of the panel label — we'll give you a free preliminary assessment (not a final quote).
Illustrative photo