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 IEC 61557-7:1997 ED1
17.220.20
Measurement of electrical and magnetic quantities
| 29.080.01
Electrical insulation in general
| 29.240.01
Power transmission and distribution networks in general
Buying
Revised
Scope
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.
Life cycle
NOW
WITHDRAWN IEC 61557-7:1997 ED1 99.60
Withdrawal effective Jan 29, 2007