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Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 16/09/2008 07:11, Uncontrolled Copy, (c) BSI BRITISH STANDARD Electrical safety in low voltage distribution systems up to 000 V a.c and 500 V d.c — Equipment for testing, measuring or monitoring of protective measures — Part 12: Performance measuring and monitoring devices (PMD) ICS 17.220.20; 29.080.01; 29.240.01 12&23