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EN IEC 61557-7:2022



The latest, up-to-date edition.

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

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IEC 61557-7:2019 is available as IEC 61557-7:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61557-7:2019 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. IEC 61557-7:2019 cancels and replaces the second edition published in 2007. This edition constitutes a technical revision. This edition includes the following changes with respect to the previous edition:

a) alignment of the structure with that of the whole IEC 61557 series;

b) updated requirements in 4.3 in accordance with new editions of IEC 61010-1 and IEC 61010-031;

c) the information on markings was extended;

d) the information on the operating instructions was extended;

e) complement to the information on the testing of leads;

f) test leads for insulated conductors were introduced;

g) Annex B was added with information on phase sequence tests and indications.

European Committee for Standards - Electrical

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