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Information about voltage breakdwon of photovoltaic arrays in the field was obtained from logbooks, site event reports, interviews with operators and visits to the array sites. The arrays studied were located at Beverly High School, Lovington Square Shopping Center, Newman Power Station, and the Oklahoma Center for Sciences and Arts. No breakdowns are reported for these sites. However, breakdowns at other sites are briefly discussed which are attributed to burrs on washers piercing insulation in one instance and delamination of a metal frame causing a short circuit in another. Other problems not attributable to voltage breakdown are also discussed. (ERA citation 09:016133)