The Equipment and components that shall be certified according to the Technical Regulation TR CU 012/2011 “On safety of the equipment for operation in explosive atmospheres” have to be marked appropriately. This includes the explosion protection marking as well as the identification number, which indicates the explosion protection of the machine and its components.

The marking shall be conducted according to the GOST standards. Electrical equipment has to be marked according to GOST 31610.0-2014 “Explosive atmospheres. Part 0. Equipment. General requirements” and GOST 60079. GOST standards are harmonised with IEC 60079-0:2001.

Ex Label

EAC EX Kennzeichen

In addition to the EAC conformity Mark, the Ex label has to be attached on the equipment.
The EAC EX label consists of the combination of to conventionalized letters “E” and “X”, while “Ex” stands for explosion protection. The height of letter “x” has to be equal to 5/9 of letter´s “E” height. The letters shall be attached on a white or contrasting background.

The height of the Ex symbol must be at least 10 mm with height-to-width aspect ratio 11/8, so that it is clearly legible with an unaided eye.
The Explosion Safety Mark shall be affixed on every machine, ex-components or technical documentations.

Markings on the type label

The marking on explosion protected equipment shall include the following components:

Equipment category

The first number on the Ex Label indicates the equipment category.

0 – Equipment with "very high" level of protection for use in explosive gas atmospheres, in which ignition danger is not likely to expect in normal operation.

1 – Equipment with "high" level of protection for use in explosive gas atmospheres, that is unlikely to become an ignition source in normal operation or during expected malfunctions

2 – Equipment with "enhanced" level of protection for usage in explosive gas atmospheres, that is unlikely to become an ignition source and provides additional protection in order to prevent danger of ignition in case of expected malfunctions.

Equipment intended for use in mines susceptible to firedamp belong to group I and shall be certified according to GOST 12.2.020-76.

PO – Equipment with very high level of protection for usage in explosive gas atmospheres
PB – Explosion protected electrical equipment
– Equipment with enhanced level of protection

Type of ignition protection

Type of gas ignition protection GOST norm
"d" Flameproof enclosures GOST R 51330.1-99
"e" Increased safety GOST R 51330.8-99
"i" ("ia", "ib", "ic") Intrinsic safety GOST R 51330.10-99
"m" ("ma", "mb") Encapsulation GOST R 51330.17-99
"nA" Non-sparking equipment GOST R 51330.17-99
"nC" Hermetically sealed facilities GOST R 51330.17-99
"nR" Gas-proof housings GOST R 51330.17-99
"o" Oil immersion GOST R 51330.7-99
"p" ("px", "py", "pz") Pressurized enclosures GOST R 51330.3-99
"q" Powder filling GOST R 51330.6-99
"s" Special protection GOST R 51330.17-99
Type of ignition protection for non electrical equipment
"t" ("tа", "tb", "tc") Protection by enclosure
"i" ("ia", "ib", "ic") Intrinsic safety GOST R 51330.10-99
"m" ("ma", "mb") Encapsulation GOST R 51330.17-99
"p" Pressurized enclosures GOST R 51330.3-99
"s" Special protection GOST R 51330.17-99
Type of dust ignition protection
"c" Constructional safety
"b" Control of ignition source
"k" Protection of liquid immersion
"d" Flameproof enclosures
"p" Pressurized enclosures
"s" Special protection

Equipment group

Group I - Equipment intended for use in underground mining works and surface mining works
Group II - Equipment intended for use in remaining areas - apart from mining - that may be exposed to an explosive atmosphere
Group III - Equipment intended for dust explosion hazardous areas, apart from mining

Subdivision of the equipment groups

The danger increases from explosion sub-group IIA to IIC.

I: Methane and coal dust
II A: Propane
II B: Ethylene
II C: Hydrogen
IIIA: Combustible flyings
IIIB: Non-conductive dusts
IIIC: Conductive dusts

Level of protection

Gas explosion protection and dust explosion protection

G – for gas
D – for conductive dusts

Ga and Da – Equipment with very high level of protection for use in explosion hazardous areas, that is unlikely to become an ignition source in normal operation or during expected malfunctions.

Gb and Db – Equipment with high level of protection for use in explosion hazardous areas, that is unlikely to become an ignition source in normal operation or during expected malfunctions.

Gc and Dc – Equipment with enhanced level of protection for use in explosion hazardous areas, that is unlikely to become an ignition source and provides additional protection in order to prevent danger of ignition in case of expected malfunctions.

Equipment for mines:

Ma - very high level of protection: Equipment in explosion hazardous areas remains in operation
Mb – high level of protection: Equipment is switched off in explosion hazardous areas

Temperature class

The ignition temperature of an explosion hazardous gas atmosphere denotes the lowest temperature of a heated surface, at which an ignition of combustible materials, such as gas or steam can occur.

Ignition temperature in °C Temperature class
>450 T1
>300 bis 450 T2
>200 bis 300 T3
>135 bis 200 T4
>100 bis 135 T5
>85 bis 100 T6

IP Protection

The IP Coding is standardized by GOST 14254-96 (IEC 529-89) “Degrees of protection provided by enclosures.

The IP protection types define the level of protection of the housing against contact, foreign bodies and water. The marking consists in the letters “IP”, two numbers and eventually two additional letters. The first number is between 0 and 6 and determines the protection against foreign bodies; the second one is between 0 and 8 and determines the protection against water. If one of these numbers shall not be indicated it has to be replaced by an “X”. If necessary, the numerical combination may be completed by letters, which describe the type of protection in more detail.

Examples: IPXX IPX5 IPX2 IP20C IPXXC IPX1C IP3XD IP23S IP21CM

Schmidt & Schmidt supports you in the certification of ATEX equipment according to the technical regulations 012/2011 for Russia and the Eurasian Economic Union. We also offer to prepare the required technical documentations with translations into Russian.

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If you have any questions regarding the production of technical documentation, please contact us, we will gladly consult you about the offer.

In our video, we explain what an EAC Certification is and how and where to certify or declare your products for the introduction on the EAEU market.

The EAC Certification and the EAC Declaration are complex procedures that attest your products the conformity with the technical regulations of the EAEU and require a lot of know-how. Schmidt & Schmidt will support you with the certification of your products for the EAEU market.

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