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Utilities have been using non-ceramic insulators (NCI)-also called composite or polymeric insulators-since the late 1970s, and their use has increased significantly in the past decade. With the large number of these units that have been in service for significant periods of time, utilities are now facing important NCI inspection and maintenance issues. To help in this process, EPRI investigated tools and methods that utility inspectors can use to identify defective NCI prior to failure. One of the …