Electrical Panels & Service Upgrades
Federal Pacific, Zinsco & Other Problem Panels
A handful of panel brands and breaker lines have long-standing reputations among electricians and home inspectors for breakers that may not trip reliably. If your home has one, it's worth a professional evaluation.
Updated 2026-10-15
Panels inspectors commonly flag
These are the names you'll most often see in inspection reports:
- Federal Pacific Electric (FPE) Stab-Lok — independent testing has reported breakers that fail to trip under overload
- Zinsco and Sylvania-Zinsco — reports of breakers fusing to the bus bar
- Challenger — certain breaker models were subject to recalls, and the panels are no longer supported
- Pushmatic (Bulldog) — very old, stiff mechanisms and no modern breaker options
- Split-bus panels without a single main breaker
How to identify yours
Open the panel door (not the inner cover) and look at the label inside. FPE breakers typically have a red stripe and the Stab-Lok name; Zinsco breakers often have colorful handles. Take a photo of the label and breakers and share it with an electrician for a quick read.
Your options
Replacement panels and listed retrofit breakers exist for some brands, but most electricians recommend replacing the panel outright, since the issues are in the design and the bus connection, not just individual breakers. If budget is tight, ask for an assessment and prioritize replacement over other cosmetic projects.
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Frequently asked questions
Is my FPE panel going to catch fire?
Many FPE panels operate for decades without incident. The concern is that a breaker may not trip when it's needed, removing a key layer of protection. That's a risk worth removing, not a reason for panic.
Will a home inspector fail my house for this?
Inspectors don't pass or fail homes, but problem panels are commonly listed as safety items, and some insurers decline coverage until they're replaced.
Can I just replace the breakers?
For some brands, third-party replacement breakers exist, but the bus and enclosure remain. Most electricians recommend full panel replacement for FPE and Zinsco.
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This guide is general information, not engineering or legal advice. Electrical codes are adopted and amended locally — consult a licensed electrician and your local building department for your project.