Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or monitoring of protective measures - Phase sequence1 Scope 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. NOTE Phase

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Basic terms and definitions

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Includes requirements for product information

requirements on performance were modified

Electrical/electronic/programmable electronic systems (E/E/PES) are utilised for functional safety in earth-moving machinery

Foreword ii

This PAS does not specify requirements for the disclosure or communication of the results of a quantification of the life cycle GHG emissions of goods and services

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to the industry and to society in general