Federal Pacific and Zinsco Electrical Panel Safety
Why these panels are still found in thousands of Seattle-area homes — and what to do if you have one.
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Why these panels are still found in thousands of Seattle-area homes — and what to do if you have one.
Federal Pacific Electric (FPE) manufactured the Stab-Lok electrical panel from the 1950s through the 1980s. These panels were installed in millions of American homes during that era, including tens of thousands of homes in King County and the greater Seattle area. The problem: independent testing and a Consumer Product Safety Commission investigation found that Stab-Lok breakers fail to trip at a significantly higher rate than other brands. A breaker that does not trip under overload conditions allows the wiring to overheat — a leading cause of house fires.
Zinsco panels (also sold under the brand name GTE-Sylvania) were popular in the 1970s. They share a similar failure mode: the breakers can weld themselves to the bus bar, making them unable to trip when needed, and the aluminum bus bars are prone to overheating. Like Federal Pacific, Zinsco panels are considered a fire hazard by most licensed electricians and electrical engineers.
Open your electrical panel door and look for the brand name on the panel or on the breakers themselves. Federal Pacific panels often say "Stab-Lok" on the breakers. Zinsco panels typically have colored breaker handles (red, green, blue) and the Zinsco or GTE-Sylvania name on the panel door. If you are not sure, send us a photo or schedule an inspection visit — we can identify the panel type immediately.
The core risk is that these panels may not protect your home during an overload or short circuit. A breaker that fails to trip lets heat build in the wiring until it reaches ignition temperature. This can happen inside walls where you cannot see it. Most home insurance policies in Washington will cover these homes, but some insurers are now asking about panel type and adding riders — and coverage could be affected in the event of a fire caused by a failed breaker.
Our strong recommendation is yes — replace a Federal Pacific or Zinsco panel. These panels have been in service for 40–60 years, their breakers cannot be reliably tested without replacement, and the fire risk is real. Many King County home buyers now specifically request sellers to replace these panels before closing.
If budget is a near-term constraint, at minimum have a licensed electrician inspect the panel for visible signs of overheating, arcing, or deterioration and document its condition. But plan for replacement.
Our inspector flagged a Federal Pacific panel. Clarity Electric replaced it with a new 200-amp Square D panel and while they were at it we added a 50-amp circuit for our EV charger. Really glad we did it. Peace of mind is worth it.
- Newcastle homeowner, January 2026
Replacing a Federal Pacific or Zinsco panel with a new 200-amp service in the Newcastle and Seattle area typically costs $2,800–$4,500 including labor, materials, permit, and PSE coordination. If the meter base also needs replacement, add $300–$600. This cost is often offset by the ability to add circuits for EV chargers, heat pumps, and other modern loads at the same time.
Clarity Electric LLC replaces Federal Pacific and Zinsco panels throughout Newcastle, Renton, Bellevue, Issaquah, Kirkland, and King County. We handle permits, PSE coordination, and inspections. Call 425-210-4791 or request a free estimate.