1DV DR Modification of Clause 1 to replace with the following: This document specifies requirements for the construction@ testing and marking for Group II electrical equipment with type of protection ??n?? which includes; sealed devices ??nC??@ hermetically sealed devices ??nC??@ non-incendive components ??nC?? and restricted breathing enclosures ??nR?? intended for use in explosive gas atmospheres. This part of IEC 60079 document applies to electrical equipment where the rated input voltage does not exceed 15 kV r.m.s. AC or DC including where the internal working voltages of the Ex product exceeds 15 kV@ for example starters for HID luminaires. Where references are made to IEC 60079 standards@ the referenced requirements found in these standards shall apply as modified by any applicable U.S. National Differences.