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County updates investigation of electric bus thermal event; two buses cleared for return to service
Summary
Following a January thermal runaway event on one electric bus, county staff and external engineers determined contactor welding and battery imbalance caused the incident; two newer-generation buses were reprogrammed and will be returned to service, while one destroyed bus remains salvaged under FTA/insurance process.
County transit staff reported the results of a multi-party investigation into a thermal-runaway event affecting an electric transit bus in January. The county said insurance-hired engineers, the bus manufacturer and county fleet technicians all reached the same conclusion about the cause: an electrical contactor welded closed during charging, creating an imbalance across battery banks that led to overheating and thermal runaway.
Transit maintenance staff credited an in-house technician who first identified the fault pattern;…
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