TL;DR

  • Federal Pacific Stab-Lok and Zinsco panels have a documented failure rate where breakers don’t trip during faults — leading to fires inside walls.
  • Insurance companies are now refusing coverage, raising rates, or requiring replacement within 30-60 days on homes with these panels.
  • Replacement costs $2,800-$4,200 for a typical 100A-to-200A upgrade, including permit, new meter socket, and SDG&E coordination. It’s a same-day job.
  • Identify FPE by the “Federal Pacific” or “Stab-Lok” name and bright orange/red breaker handles; identify Zinsco by multi-colored handles and a flat aluminum bus bar.

If you bought an older San Diego County home in the last few years, your insurance agent may have already mentioned this. Two electrical panel brands — Federal Pacific Electric (FPE) Stab-Lok and Zinsco / Sylvania — are increasingly being flagged by carriers. Some refuse to write policies on homes with them. Others raise rates. Some require replacement within 30–60 days of policy issuance.

Here’s why, and what to do if your home has one.

What’s wrong with these panels?

Both panels were installed broadly from the late 1950s through the early 1980s. Independent testing and field reports going back decades have shown that a meaningful percentage of their breakers fail to trip during a short circuit or overload event — the exact failure mode breakers are supposed to prevent.

When a breaker doesn’t trip on a fault, the wiring stays energized. Insulation melts. Conductors arc. Fires start in walls behind the panel where homeowners can’t see them.

The Consumer Product Safety Commission investigated FPE in the early 1980s. The investigation didn’t lead to a recall (resource and statutory limits at the time), but the documented failure rate is what insurance underwriters now act on.

How do you identify a Federal Pacific or Zinsco panel?

Federal Pacific Stab-Lok

Look at your main electrical panel. If it has any of the following, it’s likely FPE Stab-Lok:

  • The brand name “Federal Pacific” or “FPE” embossed on the cover or inside the panel
  • A model number starting with “NB” or “NC” (like NB100 or NC2030)
  • Breakers that look like they have a single push-in stab connector rather than a clip or screw
  • Breaker handles that are typically bright orange, red, blue, or pink (later models had black or beige handles too — the brand name is the more reliable identifier)
  • A characteristic “Stab-Lok” logo sometimes printed on the breaker bodies

Zinsco (sometimes branded Sylvania)

Zinsco panels are slightly less common in San Diego than FPE but show up in homes from the 1970s era:

  • Brand names “Zinsco” or “Sylvania” (Sylvania bought Zinsco in the late 1960s and continued using the design)
  • Breakers with multi-colored handles — typically reds, blues, and greens
  • A flat, horizontal aluminum bus bar (usually visible if the cover is removed)
  • A characteristic clicking sound or feel when the breaker handle is operated

If you’re not sure, take a clear photo of the panel cover (closed) and the inside (cover removed, breakers untouched — don’t reach in) and email it to your electrician. We can identify from a photo most of the time.

Close-up of a Federal Pacific Stab-Lok breaker removed from a panel showing the discontinued stab-style connector and bus contact
The Stab-Lok connection — the failure point that documented research shows trips unreliably during fault conditions. Photo: Bright Pro Electric.

Why are insurance companies flagging these panels now?

Three things changed in the last decade:

  1. Underwriting data caught up. Insurance carriers have decades of claims data linking these panels to fire incidents. The actuarial signal is strong enough to flag.
  2. Reinsurance pressure. Reinsurance companies (the carriers behind your carrier) raised exclusions and capital requirements for properties with documented hazards.
  3. Inspection visibility increased. Pre-purchase inspectors are now trained to spot and report these panels. The information makes it back to underwriting.

Practically: if you have a Federal Pacific or Zinsco panel and your homeowner policy is up for renewal, expect either a notice of non-renewal, a rate increase, or a 30–60-day requirement to replace. Different carriers handle it differently — but it’s no longer an “if,” it’s a “when.”

Should you worry about Challenger panels too?

There’s a third brand worth mentioning: Challenger electrical panels, made through the 1980s and into the early 1990s. Challenger isn’t as widely flagged as FPE or Zinsco, but the brand has documented issues with bus bar overheating and breaker reliability. Some carriers are starting to flag them in 2025–2026.

If you have a Challenger panel and you’re up for insurance renewal, ask your carrier directly whether they still cover it.

What does a panel replacement involve?

A panel replacement is a same-day job in most San Diego homes:

  • Permit pulled through your city or county
  • SDG&E disconnect coordinated — typically a morning disconnect, work performed, late-afternoon reconnect
  • Old panel and meter socket removed safely (FPE breakers can be live-energized; we treat them with extreme care)
  • New 200-amp main breaker panel installed (Square D QO, Eaton CH, or Siemens — all UL-listed, all reliable)
  • AFCI/GFCI breakers added per current NEC where required (kitchen, bathrooms, bedrooms, outdoor)
  • New grounding electrode and bonding to current code
  • Inspection passed and sign-off documented — the documentation is what your insurance agent needs

Cost: $2,800 to $4,200 for a typical 100A → 200A upgrade. Read our full panel upgrade cost guide for what moves the price.

Should you DIY it?

No.

Even if you have electrical experience, three things make panel replacement different from anything else in a home:

  1. The service entrance conductors are always live until SDG&E pulls the meter. There is no breaker upstream of the main breaker. Working on energized service entrance conductors is how electricians die.
  2. The permit and inspection process requires a licensed contractor in California — homeowners can’t pull electrical service permits in most jurisdictions for main panel work.
  3. Insurance liability. If the new panel is implicated in any future incident and the work was unpermitted or unlicensed, coverage is gone.

Even handy homeowners hire this out. There’s no shame in it — we hire roofers and tile setters and plumbers ourselves.

When should you replace it?

If your insurance carrier flags it, you have a deadline. If they haven’t yet but your panel is an FPE or Zinsco:

  • Before listing the home for sale — buyer inspectors will catch it and the negotiation goes harder than the cost of doing it yourself
  • Before adding major loads like an EV charger or heat pump — you need the upgrade anyway. If you’re planning a heat pump install, coordinate with Climate Pros SD on equipment sizing so we can spec the panel and breaker together in one pass.
  • Before a known insurance renewal date — avoid the surprise non-renewal letter

Frequently asked questions

How do I know if I have a Federal Pacific panel?

Look for the words “Federal Pacific” or “FPE” on the panel cover or inside the door. The breakers typically have bright orange, red, or blue handles and may have a “Stab-Lok” logo printed on them. Model numbers starting with “NB” or “NC” confirm it.

Will my homeowner’s insurance drop me if I have a Zinsco panel?

Many carriers are now refusing to write new policies or renew existing ones on homes with Zinsco or Federal Pacific panels. Some give a 30- to 60-day window to replace. Contact your carrier directly — but expect action, not just a question.

How long does a panel replacement take?

It’s a same-day job. Power is typically off for 4 to 6 hours while we coordinate with SDG&E for a morning disconnect, complete the work, and get reconnected by mid-to-late afternoon.

Can I just replace the breakers instead of the whole panel?

No. The problem isn’t individual breakers — it’s the Stab-Lok connection design and the bus bar itself. Replacement breakers for FPE panels are either counterfeit or aftermarket, and none address the documented failure mechanism. A full panel replacement is the only real fix.

For full panel upgrade pricing beyond the FPE/Zinsco context, our panel upgrade cost guide covers the complete breakdown including SDG&E coordination, permits, and brand options. Homes with FPE or Zinsco panels often have other legacy wiring issues — our knob-and-tube and aluminum wiring guide covers identification, insurance implications, and remediation options.

Service area

Panel replacement across San Diego County. We see Federal Pacific and Zinsco panels every week in older inland tract homes from the late ’60s and ’70s — particularly in El Cajon, La Mesa, Escondido, and the older parts of Chula Vista.

Free in-home assessment with a flat-rate quote. See our panel upgrade service page or call (858) 400-8901.