GB/T 18216.4-2021
交流1000V和直流1500V及以下低壓配電系統電氣安全 防護措施的試驗、測量或監控設備 第4部分:接地電阻和等電位接地電阻
Electrical safety in low voltage distribution systems up to 1000V a.c and 1500V d.c—Equipment for testing,measuring or monitoring of protective measures—Part 4:Resistance of earth connection and equipotential bonding
GBT18216.4-2021, GB18216.4-2021