Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures -- Part 8: Insulation monitoring devices for IT systems
交流1000V和直流1500V以下低压配电系统的电气安全保护措施的试验、测量或监测设备第8部分:IT系统的绝缘监测装置