IEC 61557-7 Ed. 3.1 b:2023

IEC 61557-7 Ed. 3.1 b:2023 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 7: Phase sequence CONSOLIDATED EDITION

standard by International Electrotechnical Commission, 08/01/2023

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Full Description

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 610101: 2010, Annex I and
IEC 61010-1:2010/AMD1:2016, Annex I.

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Edition: 3.1 Published: 08/01/2023 ISBN(s): 9782832274538 Number of Pages: 66 File Size: 1 file , 1.8 MB Note: This product is unavailable in Ukraine, Russia, Belarus

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