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Sunday, May 8, 2011

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Zinsco & Federal Pacific Electrical Panels
Zinsco Panels --

FAILURE MECHANISM - Failure Mechanisms for Zinsco Electric Panels and Circuit Breakers

Arcing and/or overheating, or a similar failure process occurs at the connection of the circuit breaker to the electrical panel bus damage the bus, the breaker, and the connection, making the electrical contact unreliable and leading to equipment failure.

Circuit breakers become damaged by arcing or overheating. Damaged circuit breakers are unlikely to perform properly in response to an overcurrent condition.

Federal Pacific - Stab-Lok Panels

High failure rate: The central safety defect in FPE Stab-Lok(R) electrical equipment is that FPE Stab-Lok(R) circuit breakers fail to trip under overload or short-circuit conditions, at a failure rate much higher than comparable equipment made by other producers. This failure to trip occurs up to 80% of the time when the breakers are called-on to trip, depending on the individual breaker type and ampacity. The usual industry rate of failure of a circuit breaker to trip in response to an overcurrent or short circuit is much less than 1%.

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