IEC 61557-12:2018/AMD1:2021
修改件1.交流1000V和直流1500V以下低壓配電系統的電氣安全.保護措施的試驗、測量或監測設備.第12部分:功率測量和監測裝置（PMD）
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 12: Power metering an