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Recent content by ritchieb

  1. ritchieb

    Short circuit calculation - on shipboard installations

    I have been asked to complete a short circuit calculation for an installation on board a ship. I have used DOC Win from ABB and selected the IEC 61363-1 option. I also ran the calc using the DOC Win symmetrical components method. The results are very different ie: 15kA with the symmetrical...
  2. ritchieb

    Fuse - circuit breaker coordination

    I have a 200A fuse protecting a 6kA circuit breaker. I have the i2t let through of the fuse. I need to show that this fuse will protect the circuit breaker. Do i use the peak let through of the fuse and ensure that it is less than the kA rating of the breaker? Have many tables indicating that a...
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