Certified Master Electricians
Written by Peter
Master Electrician at PRO Electric plus HVAC, serving Fairfax, Loudoun, Arlington, and Prince William Counties. Virginia License #2705181607.
Some Panels Look Fine and Are Not. These Are the Two I Replace Most.
Panel replacement and code correction across Fairfax, Loudoun, Arlington, and Prince William Counties.
Hi, I am Peter, the Master Electrician at PRO Electric plus HVAC. There are two electrical panel brands I want every older home owner in Northern Virginia to know about: Federal Pacific and Zinsco. They were installed in millions of homes decades ago, they often look perfectly normal, and they have a known, documented problem. Let me explain what is wrong and what to do.
If you have one of these panels, it does not mean your house is about to catch fire. It means you have a panel with a reliability problem that is worth replacing, and here is why.
The Federal Pacific problem
Federal Pacific Electric panels, often labeled FPE with Stab-Lok breakers, were extremely common from the 1950s into the 1980s. The concern is that their breakers can fail to trip when they should. A breaker that does not trip on an overload or a fault defeats the one job it has, which is to cut power before heat becomes a fire. That is why so many electricians recommend replacing them.
The Zinsco problem
Zinsco panels have their own documented issue. The breakers can melt or fuse to the bus bar, so they may keep passing power even in the off position or during a fault. Like Federal Pacific, a Zinsco panel can look completely normal while carrying this hidden risk, which is exactly what makes it worth a professional look.
Why these matter so much
- They look fine. Both panels often appear normal, so homeowners have no idea there is a concern until an inspection.
- The safety device may not work. The whole point of a breaker is to trip. When it may not, the protection you count on is in question.
- Inspectors flag them. These brands are well known, and a home inspection will almost always call them out.
- They affect sales and insurance. Buyers and insurers often want them replaced, so they come up during transactions.
What we do about it
The fix is a panel replacement, swapping the hazard brand panel for a modern one with breakers that trip reliably. We handle the permit, the utility coordination, and the inspection, and we make sure your circuits are correctly labeled and protected. Panel work is part of both our panel and breaker service and our electrical code correction service. A failing panel is also one of the clearest signs a home electrical system is failing.
Frequently asked questions
Are Federal Pacific panels dangerous?
They have a documented concern that their breakers can fail to trip during an overload or fault, which defeats the protection a breaker is supposed to provide. The panel often looks normal, so many homeowners do not know. Most electricians recommend replacing a Federal Pacific panel for this reason.
What is wrong with Zinsco panels?
Zinsco panels have a known issue where the breakers can melt or fuse to the bus bar, so they may keep passing power even when off or during a fault. Like Federal Pacific, the panel can look completely normal while carrying this hidden risk, which is why a professional evaluation matters.
How do I know what panel brand I have?
The brand is usually labeled on the panel door or inside near the breakers, with Federal Pacific often marked FPE and using Stab-Lok breakers. If you are not sure, an electrician can identify it quickly during a visit and tell you whether replacement is recommended.
Do I have to replace a Federal Pacific or Zinsco panel?
It is strongly recommended because the safety device may not perform when needed. Buyers and insurers also frequently ask for replacement during a sale. Swapping it for a modern panel restores reliable breaker protection and removes a common obstacle in a transaction.
How long does a panel replacement take?
Many panel replacements are completed in a day, depending on the home and any related work, with a short planned power interruption while we make the swap. We handle the permit, the utility coordination, and the inspection so the new panel is safe and fully code compliant.
Have a Federal Pacific or Zinsco panel?
Panel replacement and code correction across Northern Virginia.