If you have a Zinsco panel, plan to replace the whole panel. Inspectors widely advise this because these panels have a record of overheating and breakers that may not trip. No recall has been issued, so this is inspector advice, not a government order.
A breaker panel is the gray box that splits power from the street into your home’s circuits. A “breaker” is the switch that shuts a circuit off when it gets overloaded. A Zinsco panel is an older brand of this box, and it is the breakers that worry people.
Key Takeaways
- Inspectors widely advise replacing a Zinsco panel, and replacing the whole panel, not just the breakers.
- No recall has been issued, so this is inspector advice, not a government order.
- Look for the name Zinsco, Sylvania or GTE-Sylvania on the label inside the panel door.
- Inspectors report that breakers can overheat on the metal bar and that some may fail to trip.
- In Calabasas, a panel replacement involves a city permit, coordination with SCE and a city inspection.
- Do not count on same-day reconnection, because inspection dates depend on availability.
How do I know if I have a Zinsco panel?
Look for the name Zinsco, Sylvania or GTE-Sylvania on the label inside the panel door. Those are the names inspectors use for this equipment.
What you can safely check
- Open only the outer door. Never remove the metal cover behind it.
- Read the label and any brand name printed on the door.
- Note any scorch marks, rust, or a warm door.
- Take a clear photo of the label to show an electrician.
Can’t find a label? An electrician can identify the panel in a short visit.
Is a Zinsco panel dangerous?
Inspectors report two main problems. Breakers can overheat where they clip onto the metal bar inside the panel. And some breakers may fail to trip, which means they do not shut off when a circuit is overloaded.
Tests have not all agreed, and no one has measured how often these panels start fires. That is why inspectors do not suggest testing the breakers. Past good behavior does not show a breaker will trip when it is needed.
Can I just replace the breakers?
No. Inspectors advise against installing replacement Zinsco-type breakers. They advise replacing the entire panel instead. A new breaker on an old, overheated bar can inherit the same problem.
What does replacing a Zinsco panel involve in Calabasas?
An electrician installs a new panel and reconnects each circuit to it. The power to your home is off while this happens.
In Calabasas, a panel replacement usually follows these steps:
- Your electrician applies for an electrical permit through Calabasas Building and Safety.
- The electrician coordinates the power interruption with Southern California Edison (SCE) before the work starts.
- The electrician replaces the panel.
- The electrician requests the city inspection through the online portal. Requests are due by 3 p.m. the business day before, and dates depend on availability.
- After the electrical release inspection, the city contacts SCE to release the meter. You stay responsible for the utility applications, scheduling and fees.
Do not count on same-day reconnection, because inspection dates depend on availability. Official pages: Calabasas permit guidance, Calabasas inspection requests and SCE panel upgrade and meter-service requests.
Illustrative example
A late-1970s home had its original 100-amp Zinsco panel. After the power was safely isolated, the electrician found heat marks and pitting where a breaker met the bus bar, plus damaged insulation nearby. The panel was replaced with a new 100-amp main-breaker panel with updated grounding. A load calculation showed the existing 100-amp service was enough.
An example of a typical job, not a specific Blue Moon customer.
When should I call an electrician about a Zinsco panel?
Call to schedule an evaluation as soon as you confirm the brand. You do not need to wait for a problem.
Call right away if you notice
- A burning smell near the panel
- Scorch marks or melted plastic
- A breaker that will not stay on or off
- Buzzing or crackling from the panel
- Lights that flicker across the house
Next step
If you think you have a Zinsco panel, send us a photo of the label or call (747) 236-6734. A licensed Blue Moon electrician can confirm the brand and talk through your options. See our electrician in Calabasas page for more.
