KS C IEC 60364-4-443-2002 Electrical installations of buildings-Part 4:Protection for safety-Chapter 44:Protection against overvoltages-Section 443:Protection against overvoltages of atmospheric origin or due to switching
2005KS C IEC 60364-4-443:2005 Electrical installations of buildings-Part 4:Protection for safety-Chapter 44:Protection against overvoltages-Section 443:Protection against overvoltages of atmospheric origin or due to switching
2002KS C IEC 60364-4-443-2002 Electrical installations of buildings-Part 4:Protection for safety-Chapter 44:Protection against overvoltages-Section 443:Protection against overvoltages of atmospheric origin or due to switching