IEC 61557-7 Ed. 3.1 b:2023

Current Revision
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

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IEC 61557-7 Ed. 3.1 b:2023

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

PUBLISH DATE 2023
PAGES 66
IEC 61557-7 Ed. 3.1 b:2023

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 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.
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