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DIN EN IEC 61557-7 VDE 0413-7:2024-10

Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing, measuring or monitoring of protective measures

Part 7: Phase sequence

(IEC 61557-7:2019 + AMD1:2023); German version EN IEC 61557-7:2022 + A1:2023
Class/Status: Standard, valid
Released: 2024-10
VDE Art. No.: 0400659

This part of IEC 61557 specifies the requirements applicable to measuring equipment for testing the phase sequence in three-phase distribution systems. Indication of the phase sequence can be mechanical, visual and/or audible. This document does not apply to additional measurements for other quantities. It does not apply to monitoring relays. NOTE: Common three-phase distribution systems are depicted in IEC 61010-1:2010/AMD1:2016, 6 Annex I.