ATEX lighting is specially designed and certified for use in environments where there is an explosion hazard due to flammable gases, vapors, mists, or dust clouds. Using ordinary, uncertified fixtures in such environments is both prohibited and life-threatening. In this article, we answer the most frequently asked questions about ATEX LED lighting, so you know exactly what it is, when it is mandatory, and what to look out for.
In which environments is ATEX lighting mandatory?
As soon as an explosive atmosphere can occur, ATEX lighting is legally required. This applies to locations with flammable substances in the form of gas, vapor, mist, or combustible dust — in concentrations that can explode upon ignition. The European ATEX directives (2014/34/EU and 1999/92/EC) require employers to identify such zones and use exclusively approved equipment.
Typical environments where explosion-proof lighting is mandatory:
- Petrochemical plants and refineries
- Storage tanks and filling stations for flammable liquids
- Paint shops and coating facilities
- Flour processing, sugar refineries and grain storage (dust explosion hazard)
- Water treatment plants with biogas
- Offshore platforms and maritime installations
- Chemical plants and pharmaceutical production environments
- Mining sites
In all these environments, standard industrial lighting, no matter how robust, simply does not suffice. Even an occasionally present explosive atmosphere makes ATEX certification legally mandatory for all electrical equipment—including lighting.
What are ATEX zones and how are they classified?
ATEX zones are geographically demarcated areas within a facility, classified based on how often and how long an explosive atmosphere is present. The higher the risk, the stricter the zone classification and the heavier the requirements for the equipment.
Three zones apply to gas-hazardous environments:
- Zone 0: An explosive gas atmosphere is present continuously or for long periods. Examples are the interior of storage tanks or reactor vessels.
- Zone 1: An explosive gas atmosphere is occasionally present during normal operation. This applies, for example, to the immediate vicinity of filling points or pumps.
- Zone 2: An explosive gas atmosphere is not present during normal operation, but may occur in the event of faults or unusual conditions.
For environments with dust hazards, there is a comparable classification into Zone 20, Zone 21, and Zone 22 — the same logic, but for hazardous dust. The zone classification is the responsibility of the employer and forms the basis for selecting the correct ATEX-certified equipment. A misjudgment of the zone can have fatal consequences.
Which ATEX categories apply to luminaires?
The category of an ATEX fixture determines the required safety level and the zone in which it may be used. For gas environments, categories 1G, 2G, and 3G apply; for dust environments, categories 1D, 2D, and 3D apply.
The link between category and zone works as follows:
- Category 1G/1D: Suitable for Zone 0 and Zone 20. The highest level of safety, designed for continuous exposure to explosive atmospheres.
- Category 2G/2D: Suitable for Zone 1 and Zone 21. Intended for environments where explosive atmospheres frequently occur.
- Category 3G/3D: Suitable for Zone 2 and Zone 22. Intended for environments where an explosive atmosphere can only occur in the event of a malfunction.
A luminaire with a higher category may always be used in a lower-risk zone, but not the other way around. It is therefore not permitted to install a category 3G luminaire in a Zone 1 environment, even if the luminaire appears technically robust enough. Determining the correct category requires thorough lighting expertise — knowledge of both the zone classification and the technical specifications of the luminaire is essential for this.
What is on an ATEX marking of a luminaire?
The ATEX marking is a standardized code that indicates at a glance for which environments a luminaire is approved. It contains mandatory symbols and codes that are directly translatable to the application area, category, gas group, and temperature class.
A typical ATEX marking looks like this: II 2G Ex d IIB T4 Gb. Each part has a specific meaning:
- II: Equipment Group II, intended for above-ground industrial applications (Group I is for mining).
- 2G: Category 2, suitable for gas-hazardous environments (G = gas).
- Ex: Indication that the device complies with ATEX standards for explosion protection.
- d: The protection concept — in this case “flameproof enclosure”, which means that an internal ignition cannot propagate to the outside.
- IIB: The gas group, which indicates for which types of flammable gases the luminaire is suitable.
- T4: The temperature class, which indicates the maximum surface temperature (for T4 a maximum of 135°C).
- GB: Equipment Protection Level.
Reading and interpreting this marking is essential when selecting the correct luminaire. A luminaire that does not match the required gas group or temperature class of the environment does not meet the requirements — even if it bears the ATEX certification mark.
What are the consequences of using non-ATEX certified lighting?
Using uncertified luminaires in a potentially explosive atmosphere is a serious violation with potentially catastrophic consequences. Sparking, surface heat, or a defective enclosure can ignite an explosive atmosphere, resulting in explosions, fire, and fatalities.
In addition to the immediate safety risk, there are also far-reaching legal and financial consequences:
- Liability for injury or death of employees or third parties.
- Production shutdown by the Inspectorate SZW or other competent authorities.
- Heavy fines for violating the ATEX directives and the Working Conditions Act.
- Lapse of insurance coverage in an incident involving non-certified equipment.
- Reputational damage and prolonged legal proceedings.
Many incidents do not arise from deliberate negligence, but from insufficient knowledge of zone classification or from the use of luminaires that are robust, but not ATEX certified. The consequences are equally significant in both cases. In environments such as Offshore and maritime operations or chemical plants, this risk is particularly acute.
What should you look for when choosing ATEX lighting?
The zone classification of the location is always the starting point. Without a correct zone classification, it is impossible to select the right luminaire category. In addition, there are several technical and practical criteria that determine the choice.
The main points of attention at a glance:
- Zone classification: Ensure that the location's zone classification is formally established before selecting luminaires.
- Gas group and dust group: Check which flammable substances are present and ensure the luminaire is certified for the correct group.
- Temperature class: The maximum surface temperature of the luminaire must be lower than the ignition temperature of the substances present.
- IP rating In addition to ATEX certification, the IP and IK rating the protection against dust and moisture, which is equally important in many explosive environments.
- Ambient temperature Verify that the luminaire is resistant to the actual temperature conditions at the location, both high and low.
- Maintenance and accessibility: Choose luminaires that are easy to inspect and maintain, even in hard-to-reach locations.
- Complete documentation: Always request the complete ATEX certification, EU declaration of conformity, and technical documentation from the supplier.
When selecting ATEX lighting, collaborate with a specialized supplier who can demonstrate both technical knowledge and certification. Good, customized lighting advice prevents costly mistakes and ensures the installation complies with all legal requirements from the start.
Case Study: Bokalift 2 – Crane Vessel Working Lighting
The Bokalift 2 project clearly demonstrates how complex lighting issues can be in practice when ATEX requirements and extreme environmental conditions come together. This crane vessel operates in offshore environments where flammable gases and severe weather conditions go hand in hand — a combination that places high demands on every electrical component on board, including the work lighting.
The technical challenges were manifold. First, the lighting had to be resistant to seawater, salt, and corrosion, which required a high IP rating and corrosion-resistant materials. Second, the ambient temperature played a major role: fixtures had to function in both extreme cold and heat, depending on the area of operation. Third, accessibility for maintenance was limited — the vessel operates far from the coast, making it necessary for fixtures to be as low-maintenance as possible and easy to inspect during regular vessel stops.
The design choice fell on robust LED luminaires with a high light output, suitable for the heavy mechanical load that a crane vessel entails. Lighting levels were tailored to the specific work tasks on deck, while also taking into account the safety of the personnel during nighttime operations.
The lesson learned that directly connects to the subject of this article: in offshore environments, it is tempting to choose robust, but uncertified fixtures. Practice at Bokalift 2 shows that precisely the combination of correct certification, the right material specifications, and a well-thought-out maintenance plan makes the difference between a safe and a risky installation. More of these types of projects can be found on the Bokalift 2 project page.
How JEL Products Helps with ATEX Lighting
JEL Products provides explosion-proof lighting solutions for the most demanding industrial environments, including locations with ATEX requirements. As an ISO 9001- and VCA**-certified specialist, the company designs and manufactures luminaires in the Netherlands, with a complete focus on quality, safety, and performance under extreme conditions.
What JEL Products specifically offers for ATEX applications:
- Specialized stainless steel LED fixtures for environments with extreme corrosion and aggressive chemical exposure
- Valves with proven performance in temperature extremes from -45°C to +120°C
- Complete worry-free service: from engineering and lighting design to installation and commissioning
- In-depth knowledge of lighting in hazardous environments, also for Ports and terminals where ATEX requirements and severe operational conditions meet
- Personal advice tailored to the specific zoning and environmental requirements of your location
Do you want to be sure that your lighting complies with ATEX requirements and is safe for your specific environment? Please contact JEL Products for a no-obligation consultation.