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The Customer Average Interruption Frequency Index (CAIFI)[1] is a popular index used in electrical reliability analysis.[2] It is designed to show trends in customers interrupted and helps to show the number of customers affected out of the whole customer base.


  1. ^ Yeddanapudi, Sree. "Distribution System Reliability Evaluation". Iowa State University. Archived from the original on 26 December 2011. Retrieved 18 June 2011.
  2. ^ Power Distribution Planning Reference Book, H. Lee Willis, published by CRC Press, 2004, page 112

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