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BS EN 61557-7:1997 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring ormonitoring of protective measures - Part 7. Phase sequence

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This part of IEC 61557 specifies the requirements for measuring equipment applied to testing the phase sequence in three-phase distribution systems. Indication of the phase sequence may be mechanical, visual and/or audible. This part of IEC 61557 does not apply to ancillary measuring equipment for other quantities, for example voltage testers comprising an additional phase sequence indicator. It does not apply to monitoring relays.
Primary Item Type:
British Standard
Identifiers:
ICS 19.080 – Electrical and electronic testing
ISBN 0 580 27744 5
Language:
English
Subject Keywords:
Marking; Visual inspection (testing); Electrical safety; Low-voltage equipment; Type testing; Safety devices; Electrical insulation; Resistance measurement; Inductance measurement; Electrical protection equipment; Electrical measuring instruments; Phase (electric); Low voltage; Impedance measurement;
First presented to the public:
3/17/2026
Original Publication Date:
7/15/1997
Previously Published By:
British Standards Institution
Place Of Publication:
London, United Kingdom
Citation:
Extents:
Number of Pages - 9
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2026-03-17 11:03:06.361
Submitter:
Engku Shahidil Engku Ab Rahman

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BS EN 61557-7:1997 Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring ormonitoring of protective measures - Part 7. Phase sequence1 2026-03-17 11:03:06.361
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