IEC-61557-7 › Historical Revision Information
Part 7: Phase Sequence, Electrical Safety in Low Voltage Distribution Systems Up To 1000 V
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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. This second edition cancels and replaces the first edition published in 1997. This edition constitutes a minor revision.
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Document Number
IEC 61557-7 Ed. 2.0 b:2007
Revision Level
2ND EDITION
Status
Superseded
Publication Date
Jan. 1, 2007
Committee Number
85