Federal Pacific and Zinsco panels: what homeowners should know
By CSM Electric · · 2 min read
If a home inspector has ever written "Federal Pacific" or "Zinsco" on your report, you are not alone. Both brands were installed in a lot of homes built in the 1950s through the 1980s, including many in the western suburbs, and both have a long track record of problems.
How to tell which panel you have
- Federal Pacific Electric (FPE): look for "Federal Pacific" or "FPE" on the door label and "Stab-Lok" on the breakers, which usually have a red or black face with a thin handle.
- Zinsco: the label may say Zinsco or Sylvania-Zinsco. The breakers are often multi-colored and sit loosely in rows.
Do not remove the inner cover to look. The label on the door or the inside of the door is enough, or send a photo of it with your quote request.
Why they get flagged
The core concern with both is the same: a breaker's job is to trip when a circuit is overloaded or shorted, and these breakers have been widely reported to fail to trip in some cases. With Federal Pacific Stab-Lok breakers, the concern comes from independent testing and years of field reports. With Zinsco, the connection between the breaker and the bus bar can overheat and fuse together, so the breaker stays on when it should shut off.
Federal Pacific panels were the subject of a federal safety investigation in the 1980s that ended without a recall, which is why you will hear different opinions. In practice, many home inspectors recommend replacement, and some insurers ask about it.
What your options are
Replacement breakers for these panels are limited, and swapping individual breakers does not address problems at the bus bar. The usual fix is to replace the panel. That is also a good time to ask whether your service size still fits your home. See signs you need a panel upgrade.
If you have one of these panels and you are noticing heat, buzzing or a burning smell, do not wait. Otherwise, it is reasonable to plan the replacement. Book a free estimate visit and we will look at it, explain what we see, and quote the panel replacement.
Common questions
Is my Federal Pacific panel going to fail tomorrow?
Not necessarily. Many have run for decades. The concern is that the breakers may not trip when they should, which is the one job they have, so replacement is the common recommendation.
Can I just replace the breakers?
Options for replacement breakers are limited and do not fix problems at the bus bar, so the panel itself is usually replaced.
Will I have to replace it to sell my house?
There is no general rule, but inspectors commonly flag these panels and buyers often ask for a credit or replacement.