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1. The BILs set initially in the 1941 report of the AIEE-EEI-NEMA Committee on Insulation Co-ordination10 have proved to be sound, with adequate flexibility for economic application. The authors have worked effectively with this framework. The 60-cycle rating of the lightning arrester is the base point for determining a suitable BIL, and therefore must be selected only after full and careful consideration...
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