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EVS-EN 61557-11:2009 Elektriohutus madalpingevõrkudes vahelduvpingega kuni 1000 V ja alalispingega kuni 1500 V : kaitsesüsteemide katsetus-, mõõte- ja seireseadmed. Osa 11, A- ja B-tüüpi rikkevooluseireseadmete tõhusus TT-, TN- ja IT-süsteemides = Elec...
Translator: Endel Risthein, Author: Eesti Standardikeskus
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