
CAIDI gives the average outage duration that any given customer would experience. CAIDI can also be viewed as the average restoration time. CAIDI is measured in units of time, often minutes or hours. It is usually measured over the course of a year, and according to IEEE Standard 1366-1998 the median value for North American utilities is approxima...
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http://en.wikipedia.org/wiki/CAIDI

A distribution circuit reliability average interruption duration index. It represents the average time required to restore service to the average customer per sustained interruptions.
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http://www.youngco.com/young2.asp?ID=4&Type=3
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