This part of IEC 60079 contains the specific requirements for design, construction and assessment of intrinsically safe systems, Type of Protection i , intended for use, as a whole or in part, in locations in which the use of Group I, II or III Ex Equipment is required. NOTE 1 This standard is intended for use by the designer of the system who may be a manufacturer, a specialist consultant or a member of the end-user s staff. This document supplements and modifies the general requirements of IEC 60079-0 and the intrinsic safety standard IEC 60079-11. Where a requirement of this standard conflicts with a requirement of IEC 60079-0 or IEC 60079-11, the requirement of this standard takes precedence. This document supplements IEC 60079-11, the requirements of which apply to apparatus used in intrinsically safe systems. The installation requirements of Group II or Group III systems designed in accordance with this standard are specified in IEC 60079-14. NOTE 2 Group I installation requirements are presently not provided in IEC 60079-14. Installation requirements for Group I are being considered.