Common Questions
Are Federal Pacific and Zinsco panels dangerous?
Short answer
Federal Pacific Stab-Lok and Zinsco panels are widely regarded as a concern in the trade and are routinely flagged by home inspectors and insurance carriers. The concern is that their breakers may fail to trip under fault conditions. Not every one of these panels is in bad condition, but they cannot be repaired to modern standards and the usual recommendation is replacement.
How to identify each
Federal Pacific Stab-Lok
The panel is generally marked "Federal Pacific Electric" or "FPE" on the label inside the door or on the deadfront. The breakers are commonly branded Stab-Lok and many carry a distinctive handle with a coloured stripe. The equipment was installed widely in homes built and remodeled through the mid-twentieth century, so it turns up across a broad range of Spokane housing.
Zinsco and Sylvania-Zinsco
Labels read Zinsco, Sylvania-Zinsco, or GTE-Sylvania depending on the era. Breaker handles are often coloured, and the breakers engage a bus bar in a way that looks different from modern equipment. If you can photograph the label and the row of breakers with the cover still on, that's usually enough for us to identify it before we come out.
Why they get flagged
The concern with both is the same in substance: that a breaker may fail to trip under fault conditions. A breaker's entire purpose is to open the circuit when something goes wrong, and equipment where that function is in question is treated seriously by the trade.
We're not going to quote you a failure rate or point at a particular study, because the reporting on these panels varies and we'd rather be accurate than dramatic. What we can say plainly is that they are widely regarded as a concern, that home inspectors routinely note them, and that insurance carriers commonly ask about them.
There's a second, less discussed issue: these are obsolete product lines. Even a panel in sound condition is difficult to service, because listed breakers for it are hard to source reliably and you cannot lawfully install breakers that aren't listed for the panel.
What an inspector or insurer will likely say
A home inspector will typically note the panel by name in the report and recommend evaluation by a licensed electrician. That language is standard and it doesn't mean the inspector found a specific defect. It means the equipment warrants a closer look.
Insurers vary more. Some ignore it, some ask for an electrician's assessment, and some decline or non-renew until the panel is replaced. If you're mid-transaction, this is the item most likely to end up on a repair addendum with a deadline attached, which is what our inspection repair page is built around.
What your options actually are
Realistically there are two: leave it and manage the consequences, or replace it. There isn't a meaningful third option where the panel gets repaired to modern standards, because the components to do that aren't reliably available.
Our approach is to assess the actual panel rather than replacing on reputation alone. We take the cover off and look at condition, breaker seating, signs of heat or arcing, grounding and bonding, the meter base and mast, and how the circuits are landed. Sometimes what we find is a panel in reasonable shape and a homeowner with an insurance letter. Sometimes we find heat damage. Either way you get told what's actually there.
What replacement involves
A panel replacement is permitted work with an inspection. We run a load calculation first: the NEC minimum service for a single-family dwelling is 100 amps, and 200 amps is a market convention rather than a code requirement, so the right size comes out of your actual loads.
On the day, Avista disconnects the service. Avista owns the service conductors and the meter; you own the meter socket, mast, service entrance conductors, and panel. Avista requires 48-hour notice, only Avista removes the meter seal, and reconnection happens after the inspector's sticker is on the meter socket. The full sequence is on the panel upgrade page.
What drives the cost:
- Whether the meter base and service mast also need replacing
- Service amperage after the load calculation
- Overhead versus underground service
- Whether the panel has to move location
- Condition of the grounding electrode system
- Existing wiring corrections found once the cover comes off
- Permit and inspection fees
- Avista coordination and scheduling
Other panels that sometimes get flagged
Fuse boxes and 60-amp services are common in Spokane's pre-war housing and are usually the clearest candidates for a service change, not because they're unsafe by definition, but because they were sized for a household with no central air, no EV, and no home office.
Condition-based issues get flagged across every brand: corroded meter bases, double-tapped breakers, missing or inadequate grounding and bonding, and evidence of overheating. If a breaker in your panel has been misbehaving, that's a diagnosis question first, see why breakers keep tripping and our repair and troubleshooting page.
Talk it through with a licensed electrician
If you'd rather have someone look at it than guess, book a time or call us. We'll tell you what we actually find.
Related questions
- Do I need a permit for electrical work in Spokane?
- Is knob-and-tube wiring safe, and does it have to be replaced?
- Why do my breakers keep tripping?
- What's the difference between a panel change and a service change?
- Do I need 200-amp service?
- Is aluminum wiring safe?
- What size generator do I need?
- Where is GFCI protection required?
- Common electrical questions
Frequently Asked Questions
How do I know if I have a Federal Pacific panel?+
Look at the label inside the panel door or on the deadfront. Federal Pacific Electric panels are usually marked 'Federal Pacific Electric' or 'FPE', and the breakers themselves are commonly labeled Stab-Lok. Many have a distinctive breaker handle with a colored strip. If you're not sure, photograph the label and the breakers and we can tell you what you're looking at.
How do I identify a Zinsco panel?+
Zinsco panels are typically labeled Zinsco, or Sylvania-Zinsco or GTE-Sylvania on later equipment. The breakers often have colored handles and slide into a bus bar rather than clipping over a stab in the usual way. As with FPE, the label and a clear photo of the breakers is usually enough to identify it.
Does a Federal Pacific or Zinsco panel have to be replaced?+
There is no rule that forces replacement simply because of the brand. In practice replacement is the usual recommendation because the equipment is obsolete, reliable listed breakers are difficult to source, and inspectors and insurers commonly flag it. We assess the actual panel in front of us before recommending anything.
Will my insurance company require me to replace it?+
Some carriers flag these panels at policy inspection or renewal, and some decline coverage until they're replaced. It varies by carrier. If you've received a letter, bring us the specific wording and we'll look at what's installed and what would address it.
Can you just replace the breakers instead of the whole panel?+
Generally no, and this is the practical heart of the matter. Only breakers listed for that specific panel may be installed in it, and reliable listed replacements for these panels are hard to obtain. That's why the answer usually ends up being a new panel rather than new breakers in an old one.
Are there other panels that get flagged?+
Yes. Fuse boxes and undersized 60-amp services come up constantly in Spokane's older housing stock, and some Challenger and older split-bus panels draw comment as well. Condition matters too: corrosion, double-tapped breakers, and missing grounding and bonding get flagged regardless of brand.
Do I need a permit to replace a panel?+
Yes. A panel replacement or service change always requires an electrical permit and inspection. Washington State Labor & Industries handles that across the Spokane region, with the City of Spokane running its own program inside city limits.