TR CU 012/2011 On safety of equipment intended for use in explosive atmospheres

The Technical Regulation of the Customs Union TR CU 012/2011 is a regulation that ensures safe operation of equipment in explosive environments. The main purpose of the technical regulations is to protect people and free movement of specific equipment in the territories of EACU member countries.

What does TR CU 012/2011 cover?


  • Electrical equipment (electrical apparatus), including Ex-components
  • Non-electrical equipment intended for use in explosive atmospheres.

The identification features of devices subject to mandatory EAC certification are those that the manufacturer specifies as explosion proof in the technical documentation and special EX-marking.


  • Household appliances such as gas stoves, heating boilers, ovens and other explosion-risk devices due to fuel gas leakage
  • All means of transport
  • Products of a nuclear defense complex without explosion protection
  • PPE and medical equipment for research

Marking indicates characteristics – levels and types of explosion protection used, groups of explosive atmospheres for operation explosive atmospheres and temperature class – that are investigated during the compliance certification process with the requirements of TR CU 012/2011.

Equipment classification

In order to ensure the optimal selection and safe operation of certified equipment in explosive environments, they have been divided according to explosion threat:

  • 0, 1, 2 Class – caused by gas mixtures
  • 20, 21, 22 Class – caused by dust mixtures

Equipment is classified into groups depending on the field of application:

  • I – underground with above-ground structures with risk of combustible dust and mine gases formation
  • II – gas mixtures
  • III – places with combustible dust mixtures

According to explosion protection level:

  • “Ultra explosion-proof” (EPL Ma, Ga, Da) – ultra-high-security equipment that remains operational even in the case of possible failures
  • “Explosion-proof” (EPL Mb, Gb, Db) – equipment for operation explosive environment of groups I and III that functions normally even with a single damage
  • “Equipment protection by increased safety” (EPL Mc, Gc, Dc) – increased explosion protection, assumes equipment of groups I and III that operates only in normal mode.

EAC certificate of conformity

TR CU 012/2011 EAC Certificate of Compliance is mandatory for all equipment intended for use in explosive environments. The EAC certificate not only proves successful safety assessment but also provides with the following:

  • Right to manufacture and sell devices with Ex components throughout EACU
  • Competitive advantage
  • Trust of partners and buyers
  • Opportunity to expand markets
  • Increased profits

To issue an Explosion proof EAC Certificate for an equipment, it is needed to contact EAC Certification Body with the appropriate accreditation to:

  • Submit an application
  • Prepare a set of documentation
  • Samples testing in an accredited laboratory
  • In case of serial deliveries, analysis of the production is carried out.

Required documentation

List of required documentation subject to full compliance verification:

  • Technical specifications
  • Operating instructions manual
  • Equipment’s technical passport
  • Explosion protection drawings, electrical and intrinsically-safe circuits diagrams
  • Nameplate draft project
  • Level of ignition risk according to GOST 31441.1
  • All available authorization document

TR CU 012/2011 ready-made conformity EAC Certificate of Compliance is issued when conducted all successful implementation measures. The details of the EAC Certificate are entered into the Unified Register of the Customs Union, hosted on the website of the Federal Service for Accreditation.

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