交流1000V和直流1500V及以下低压配电系统电气安全 防护措施的试验、测量或监控设备 第4部分:接地电阻和等电位接地电阻
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