6. Transport equipment to which these Regulations apply shall, subject to the provisions of ATP, Annex 1, paragraph 5, comply with the standards for one of the classes (insulated, refrigerated, mechanically refrigerated or heated equipment) in paragraphs 1 to 4 (inclusive) of ATP, Annex 1 and shall be such as to ensure that throughout an international journey for the carriage of perishable foodstuffs of a particular class, the temperature limits referred to in Regulation 5 are not exceeded in respect of perishable foodstuffs of that class.