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IEC 61557-4 Ed. 1.0 b:1997
M00001024
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IEC 61557-4 Ed. 1.0 b:1997 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 4: Resistance of earth connection and equipotential bonding
standard by International Electrotechnical Commission, 02/14/1997
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