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Significant Factors

Summary

  1. Worn bearings led to impeller and shroud rubbing, weakening the blade tips.
  2. The fan blade tips failed, creating an out of balance condition and vibration.
  3. Chiller boost fan vibration resulted in the wires chafing and electrical short circuit initiating the fire.
  4. The trip free capability of the circuit breaker in the chiller boost fan electrical circuit prevented rapid electrical isolation.



 
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