If you have bought or sold a house in Los Angeles built between the 1950s and the early 1980s, there is a good chance the inspection report flagged the electrical panel. Two brands account for most of those flags: Federal Pacific Electric (the Stab-Lok line) and Zinsco (also sold under the GTE-Sylvania name). Here is what the fuss is about, in plain terms.
What a breaker is supposed to do
A circuit breaker has one job: when a circuit carries more current than its wiring can handle, or when a fault sends current where it should not go, the breaker trips and cuts the power. A breaker that does not trip leaves the wiring to carry the overload, and overheated wiring is how electrical fires start.
Federal Pacific Stab-Lok
Stab-Lok panels were installed in millions of homes. The problem is the breakers: independent testing over the years found that a large share of them fail to trip under overload or short-circuit conditions, far above what any breaker should. The U.S. Consumer Product Safety Commission investigated in the early 1980s and closed the case without a recall, but the test findings stood, and the brand has been out of business for decades. There are other known issues too, such as breakers that are "on" when the handle shows "off," and loose connections at the bus bar.
How to recognize one: the label inside the door says Federal Pacific Electric or FPE, and the breakers have a distinctive narrow design with the "Stab-Lok" name on them, often with red or orange handles.
Zinsco and GTE-Sylvania
Zinsco panels have a different weakness: the breakers connect to an aluminum bus bar, and over time the connection corrodes and overheats. Breakers can weld themselves to the bus, which means they look fine but cannot trip, and the bus itself can be damaged. Many of these panels also have breakers that trip too slowly.
How to recognize one: the label says Zinsco, Magnetrip or GTE-Sylvania, and the breakers often have colored handles (blue, green, red) sitting flush with the panel face.
Why it matters even if nothing has gone wrong
These panels can sit quietly for forty years. The risk shows up on the one day the breaker is supposed to trip and does not. That is why home inspectors flag them, why some insurers decline coverage or ask for replacement before writing a policy, and why a buyer's inspector will raise it during a sale.
What we recommend
Replace the panel. There is no reliable way to "fix" these panels in place: replacement breakers are either unavailable, expensive, or carry the same design. A replacement gives you a modern panel with properly rated breakers, room for the circuits you will want later (an EV charger, air conditioning, an ADU), and a clean inspection record for the house.
A panel replacement is a permitted job with your city's building department, and because the service equipment is involved, your utility (LADWP in the City of Los Angeles, SCE in most other cities) schedules the disconnect and reconnect. The work itself takes about a day; the utility's scheduling sets the overall timeline. Our panel upgrade page walks through the whole process.
Not sure what you have?
Open the panel door and take a photo of the label and the breakers. Send it with the estimate form, which has a photo field, and we will tell you what you are looking at. Or call (844) 430-7681. The on-site visit is free, and the price comes in writing after we have seen the panel.