Zinsco electrical panels, manufactured by the Zinsco Electric Company, were popular in residential construction during the 1960’s – 1970’s. Concerns have been raised about the safety and reliability of Zinsco panels due to design flaws and issues with circuit breakers failing to trip under overload conditions, leading to the potential for electrical fires.
Source: InterNACHI – “Zinsco Electrical Panels”
https://www.nachi.org/zinsco.htm
Federal Pacific Electric (FPE) Panels:
Federal Pacific Electric (FPE) panels were widely installed in homes across the United States from the 1950s to the 1980s. However, numerous reports and studies have highlighted significant safety issues with FPE panels, including circuit breakers failing to trip when overloaded and defective components leading to electrical fires and other hazards.
Source: U.S. Consumer Product Safety Commission (CPSC) – “Federal Pacific Electric (FPE) Panels”
Sylvania, a brand of electrical panels manufactured by GTE-Sylvania, was also commonly used in residential construction before 1980. While there is less information available specifically regarding Sylvania panels, concerns about the safety and reliability of older electrical panels, including Sylvania, have been raised due to factors such as aging components, inadequate circuit protection, and potential design flaws.
Source: Home Reference – “Electrical Panels: A Guide for Homeowners”