The Certificate of Conformity of the Customs Union (TR CU certificate or EAC CoC) is a document confirming the compliance of the goods with the requirements of technical regulations that are common for all countries that are part of the EAEU. An applicant or a person applying for a certificate can only be a resident of the EAEU. The issuance of certificates is carried out under the strict control of the National Accreditation Agencies of the countries – member of EAEU.

EAC CoC can be issued only after passing the mandatory product certification procedure within the framework of the requirements of the technical regulations of the Customs Union. Obtaining a voluntary certificate of the Customs Union is not provided.

There is no single large list of products subject to mandatory certification in the Customs Union. There are many lists of individual types of products, which, as a rule, are adopted by the decision of the Board of the Eurasian Economic Commission. In some technical regulations, the list of products is available in the form of an attachment, and in some it is absent altogether. Instead, certain parameters are indicated to help determine the mandatory certification (for example, in the technical regulations for equipment for work in explosive atmospheres and equipment operating under excessive pressure). To date, most of the technical regulations of the Customs Union have already entered into force, therefore, the mandatory requirements for various product groups are established precisely in such documents.