This publication contains the Rules of Procedure of the IECEx Scheme, hereinafter referred toas the "Rules", for the certification of service facilities involved in selection of Ex equipmentand design of Ex installations which is intended for use in explosive atmospheres (IECExCertified Service Facilities Scheme – Part 2).Rules covering the IECEx Certified Equipment Scheme and the IECEx Certification ofPersonnel Competencies Scheme are given in Publications IECEx 02 and IECEx 05respectively.These Rules relate to the Basic Rules of the IECEx System, as given in Publication IECEx 01.