ATEX 2014/34/EU

Equipment in Explosive Environments

The ATEX Directive (2014/34/EU) regulates equipment and protective systems used in explosive environments. Its purpose is to prevent electric or mechanical equipment from causing ignition of gas, vapor, or dust. It applies to machine manufacturers, integrators, operators, and component suppliers.

What does the ATEX Directive entail?

1. When does ATEX apply?

   The directive applies to all equipment that can be used in environments where explosive atmospheres may occur.
   - Gas, vapor, or mist (e.g., chemical industry, refineries)
   - Dust and powder (e.g., food industry, sawmills, agriculture)

   Examples:
   - A motor in a silo
   - A fan in a paint storage
   - A sensor in a gas pipeline

   All of these must be ATEX certified according to the correct zone and category.

   
   

2. Classification - Zones and Categories

   ATEX is divided into two areas and several categories:

   Area	Zone	Atmosphere	Equipment Category
   Gas	Zone 0	Continuous explosive atmosphere	Category 1G
   Gas	Zone 1	Sporadic explosive atmosphere	Category 2G
   Gas	Zone 2	Rare and short-term	Category 3G
   Dust	Zone 20	Continuous explosive atmosphere	Category 1D
   Dust	Zone 21	Sporadic explosive atmosphere	Category 2D
   Dust	Zone 22	Rare and short-term	Category 3D

   Tip: Always start by determining which zone the equipment will be used in - it governs all further design and documentation.

   
   

3. Marking - What CE + EX Means

All products covered by ATEX must be CE marked and marked with the EX symbol. Example of marking: II 2G Ex db IIB T4 Gb

Here means:
II - Equipment for surfaces (not mines)
2G - Zone 1, gas
Ex db - Type of protection (pressure enclosure)
IIB - Gas group
T4 - Max outer temperature
Gb - Protection level

Noex Tip: The marking must be found both on the product and in the technical file - otherwise, the CE marking is invalid.

4. CE Marking and Documentation

To obtain a CE mark for an ATEX product, the following is required:

1. Risk analysis for explosion risks

2. Classification of zones and category

3. Assessment of ignition sources (static electricity, friction, sparks, heat)

4. Testing and verification of the equipment

5. Technical documentation according to Annex III

6. Declaration of conformity and CE/EX marking

According to Article 13, equipment in category 1 (high risk) must be reviewed by a Notified Body.

5. Requirements for User Manual

The user manual should include:

• Zone affiliation and category

• Temperature limits

• Type of protection

• Specific conditions for use ("X marking")

• Maintenance and inspection intervals

  Common mistake: Copying standard texts - each environment requires a unique risk assessment.

Technical Overview - ATEX for Industry Professionals

Article 1-3: Scope and Definitions

ATEX applies to:

• Machines, components, and protective systems that can become a source of ignition.

• Mechanical equipment (bearings, fans, gears, pumps).

• Electrical equipment (motors, sensors, control panels)

• Protective systems (fire dampers, shut-off valves).

Exceptions: medical equipment, personal protection, certain vehicles.

Annex II - Basic Health and Safety Requirements

Requirements for:

• Temperature control

• Mechanical strength

• Material selection and ignition risk

• Static electricity

• Grounding and potential equalization

• Design of seals and enclosures

Noex Tip: Link your risk analysis directly to Annex II requirements - then the CE review is easier and traceability is clear.

Practical Example - Fan Motor in Zone 1

Scenario: An electric motor drives a fan in a ventilation system for solvents.

Requirements according to ATEX:

• Category 2G (Zone 1, gas)

• EX marking: II 2G Ex eb IIB T3 Gb

• Protection type: enhanced safety ("eb")

• Max outer temperature: 200°C

• The motor must be grounded, have spark-protective brushes, and documented heat test.

Good practice: Document test results, drawings, and certificates in a common EX folder in Noex docs - required during inspection.

Examples of Ignition Sources (according to EN1127-1)

• Hot surfaces

• Mechanical sparks

• Electricity / static charge

• Flames / hot gases

• Compression

• Electromagnetic waves

• Chemical reactions

Think like this: A spark of 0.3 mm in a mixture of air and gas is enough for ignition - that's why ATEX is so strict.

Technical Documentation Requirements (Annex III)

Must include:

• Drawings and diagrams

• Risk analysis (incl. zone classification)

• Material specification

• Test protocols

• Declaration of conformity

• Notified Body certificate (if applicable)

The documentation must be retained for at least 10 years after the product is released to the market.

Consequences of ATEX Non-Compliance

• Sales ban or recall

• Revoked CE/EX certificate

• Criminal liability in case of accidents

• Liability for damages in case of explosions

Example: In 2022, a dust explosion in a sawmill in Poland caused major damage - the equipment lacked proper ATEX classification.

Common Mistakes to Avoid

• Incorrect zone assessment (e.g., Zone 2 classified as Zone 1)

• Assessing only electrical components - mechanical ones can also cause sparks

• Lack of documented ignition analysis

• Missing EX marking in the user manual

• Use of components without certification from Notified Body

FAQ ATEX 2014/34/EU

1. What does ATEX mean?
   Answer: ATEX comes from French "ATmosphères EXplosibles" and refers to equipment for explosive environments.

   
   

2. Must all products in industrial environments be ATEX certified?
   Answer: No, only those used where explosive atmospheres can occur.

   
   

3. Does ATEX also apply to dust?
   Answer: Yes, dust (flour, wood, sugar, metal) can form explosive atmospheres and is covered by the directive.

   
   

4. How long is an ATEX certification valid?
   Answer: As long as the product is not substantially changed or updated with new components.