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BS 12/30228018 DC BS EN 61557-15. Electrical safety in low voltage distribution systems up to 1000 V a. c. and 1 500 V d. c. Equipment for testing, measuring or monitoring of protective measures. Part 15. Functional safety requirements for insulation monitoring devices in IT systems and equipment for insulat ion faul
standard by BSI Group, 02/14/2012
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