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EVS-EN IEC 61557-1:2021 Elektriohutus madalpingevõrkudes vahelduvpingega kuni 1000 V ja alalispingega kuni 1500 V : kaitsesüsteemide katsetus-, mõõte- ja seireseadmed. Osa 1, Üldnõuded = Electrical safety in low voltage distribution systems up to 1000 ...
Translator: Tõnu Lehtla, Author: Eesti Standardimis- ja Akrediteerimiskeskus
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