Performances, constructions, testings, markings, danger zone dividings and the like of explosion-proof electrical equipment for a gas category shall comply with the provisions in national standard CNS 3376 series, international standard IEC 60079 series or its equivalent.
Where there are discrepencies between CNS 3376 series and IEC 60079 series, IEC 60079 series shall govern.

Performances, constructions, testings, markings, danger zone dividings and the like of explosion-proof electrical equipment for a powder-dust category shall comply with the provisions in national standards CNS 3376 and CNS 15591 series, international standards IEC 60079 and IEC 61241 series or their equivalent.
Where there are discrepencies between CNS 3376 and CNS 15591 series and IEC 60079 and IEC 61241 series, IEC 60079 and IEC 61241 series shall govern.

The structures and performances of the voltage reducing devices for AC arc welding equipment shall comply with the requirements of CNS 4782.