Amendment 1 - Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - Part 7: Phase sequence IEC 61557-7:2019/AMD1:2023 ED3
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