KS C IEC 60621-4:2005 Electrical installations for outdoor sites under heavy conditions (including open-cast mines and quarries)-Part 4:Requirements for the installation
2014KS C IEC 60621-4:2014 Electrical installations for outdoor sites under heavy conditions (including open-cast mines and quarries)-Part 4:Requirements for the installation
0000 KS C IEC 60621-4-2005(2010)
2005KS C IEC 60621-4:2005 Electrical installations for outdoor sites under heavy conditions (including open-cast mines and quarries)-Part 4:Requirements for the installation