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If you have the older Zinsco - Sylvania panelboxes the following picture shows a failure at the breaker location. It is advised that you change out your panel.
ZINSCO SYLVANIA ELECTRICAL PANELS - CONTENTS: Zinsco Electrical Panel Advice for Homeowners and Home Buyers - What are the hazards of Zinsco or Zinsco-Sylvania electric panels? Zinsco & Zinsco/Sylvania electrical panel identification guides & Kearney electrical panel identification guide
Independent testing of Zinsco breakers confirms failures
Zinsco failure reports, though few in number, indicate severe failures of Zinsco electrical panels / circuit breakers including failure of the circuit breaker to trip on overcurrent, arcing and burn-ups at the breaker to panel bus bar connection
ZINSCO SYLVANIA ELECTRICAL PANELS - CONTENTS: Zinsco Electrical Panel Advice for Homeowners and Home Buyers - What are the hazards of Zinsco or Zinsco-Sylvania electric panels? Zinsco & Zinsco/Sylvania electrical panel identification guides & Kearney electrical panel identification guide
Independent testing of Zinsco breakers confirms failures
Zinsco failure reports, though few in number, indicate severe failures of Zinsco electrical panels / circuit breakers including failure of the circuit breaker to trip on overcurrent, arcing and burn-ups at the breaker to panel bus bar connection