IEC 61557-7 Ed. 3.0 b:2019

Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 7: Phase sequence

International Electrotechnical Commission, 07/26/2019

Publisher: IEC

File Format: PDF

$47.00$95.00

Description

Published:26/07/2019

Pages:28

File Size:1 file , 1.2 MB

Note:This product is unavailable in Ukraine, Russia, Belarus

IEC 61557-7 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.