Several historical electrical panel brands are universally condemned by home inspectors, electricians, and insurance companies as dangerous fire hazards due to catastrophic design defects. The most notorious bad brands include Federal Pacific Electric (FPE) Stab-Lok panels (which frequently fail to trip during overloads), Zinsco and Sylvania panels (known for melting and fusing breakers to bus bars), and Challenger panels from the late 20th century, which suffer from severe thermal cracking and overheating.
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