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EVS-EN 61557-8:2007 Elektriohutus madalpingevõrkudes vahelduvpingega kuni 1000 V ja alalispingega kuni 1500 V : kaitsesüsteemide katsetus-, mõõte- ja seireseadmed. Osa 8, IT-süsteemide isolatsiooniseireseadmed = Electrical safety in low voltage distrib...
Translator: Endel Risthein, Author: Eesti Standardikeskus