For an Assembly (e.g. Skid) the ManufacturerSupplier shall issue an ATEX Declaration of Conformity following Annex VIII of ATEX Directive for Zone 2 and in addition for Zone 1 & Zone 0 an ATEX Certificate following Annex IX of ATEX Directive.The CEATEX Declaration of Conformity and if any the ATEX certificate shall contain all the equipment comprises the Assembly. Skid/Assembly suppliers shall obligatorily use, in their scope of supply, only ATEX certified instrumentation (according to European Harmonized Standards latest edition) adequate for the installation area identified in the purchase specification.The Supplier for Assembly and Mechanical equipment shall send to BH GE an ATEX Risk Assessment based on the following standards EN1127-1, EN ISO80079-36 and other related applicable standards.