IEC 61557-7 Revised
IEC 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 or monitoring of protective measures - Part 7: Phase sequence
Specifies requirements for measuring equipment applied to testing th
e phase sequence in three-phase distribution systems. Indication of
the phase sequence may be mechanical, visual and/or audible.
e phase sequence in three-phase distribution systems. Indication of
the phase sequence may be mechanical, visual and/or audible.
CHF 20.-
A more recent version of this publication exists: IEC 61557-7:2019+AMD1:2023 CSV
Technical committee
TC 85 Measuring equipment for electrical and electromagnetic quantities| Publication type | International Standard |
| Publication date | 1997-02-28 |
| Edition | 1.0 |
| ICS | 17.220.20 29.080.01 29.240.01 |
| Stability date | 2007 |
| ISBN number | 2831837057 |
| Pages | 15 |
| File size | 104.97 KB |