Electrical installations of buildings - Part 4: Protection for safety; Chapter 44: Protection against overvoltages; Section 442: Protection of low voltage installations against faults between high-voltage systems and earth; German version HD 384.4.442 S1:1997
建筑物电气装置.第4部分:安全防护;第44章:过电压保护;第442节:针对高压系统和接地之间故障的低压装置保护;德语版HD 384.4.442 S1:1997