what are atex zones?

what are atex zones? ATEX zones classify hazardous areas where explosive gases, vapors, mists, or dust may exist and define the required protection level for electrical equipment used in these environments.

In industrial projects, ATEX zoning is not simply a label on a drawing. It determines which lighting fixtures, junction boxes, sensors, and electrical equipment can safely operate in areas where ignition risks exist.

During hazardous area lighting projects at SEEKINGLED, I have reviewed installation requirements for oil terminals, chemical plants, and manufacturing facilities. The biggest mistake I see is selecting equipment before understanding the actual ATEX zone classification.

What Are ATEX Zones and Why Are They Important?

ATEX zones are hazardous area classifications defined under European explosion protection regulations.

The purpose is to identify locations where explosive atmospheres may occur and ensure equipment is designed with suitable protection.

The ATEX framework comes from two main European directives:

• 2014/34/EU – Equipment and protective systems intended for use in potentially explosive atmospheres
• 1999/92/EC – Workplace safety requirements for explosive atmospheres

According to the European Commission, ATEX requirements apply to equipment used in workplaces where explosive atmospheres may occur.

Source:
European Commission – ATEX Directive
https://single-market-economy.ec.europa.eu/sectors/mechanical-engineering/atex_en

ATEX Gas Zones Explained: Zone 0, Zone 1, Zone 2

For gases, vapors, and mists, hazardous locations are divided into three main zones.

ATEX Zone	Definition	Typical Location
Zone 0	Explosive atmosphere exists continuously or for long periods	Inside storage tanks, process vessels
Zone 1	Explosive atmosphere is likely during normal operation	Pump areas, filling stations
Zone 2	Explosive atmosphere is not likely but may occur temporarily	Surrounding areas near equipment

The difference between zones is mainly based on the frequency and duration of explosive atmosphere presence.

A Zone 0 location requires the highest protection level because the explosive atmosphere is expected continuously or for extended periods.

ATEX Dust Zones: Zone 20, Zone 21, Zone 22

Dust environments use a different classification system.

ATEX Dust Zone	Description	Example Applications
Zone 20	Explosive dust atmosphere exists continuously	Inside dust collectors
Zone 21	Explosive dust atmosphere may occur during normal operation	Flour mills, grain processing
Zone 22	Explosive dust atmosphere occurs rarely	Packaging areas

Dust explosions are a serious industrial safety concern. The U.S. Occupational Safety and Health Administration (OSHA) identifies combustible dust as a significant workplace hazard in industries such as food processing, chemical manufacturing, and metal processing.

Source:
OSHA – Combustible Dust Safety
https://www.osha.gov/combustible-dust

How ATEX Zones Affect Explosion-Proof Lighting Selection

The ATEX zone directly determines what type of lighting equipment can be installed.

For example:

Zone	Typical Lighting Requirement
Zone 0	Equipment with very high protection level
Zone 1	Explosion-proof lighting certified for frequent explosive atmosphere risk
Zone 2	Equipment suitable for occasional explosive atmosphere exposure

Before choosing hazardous area lighting, engineers usually confirm:

• Gas or dust classification
• Temperature class
• Equipment protection level
• Certification requirements
• Installation environment

A fixture suitable for Zone 2 cannot automatically be installed in Zone 1.

ATEX Zone Marking and Equipment Classification

ATEX-certified equipment includes markings showing its approved application.

A typical marking may include:

II 2G Ex db IIC T6 Gb

Meaning:

• II – Equipment group for surface industries
• 2G – Category for gas hazardous areas
• Ex – Explosion protection
• db – Flameproof enclosure protection
• IIC – Gas group with highest protection requirement
• T6 – Maximum surface temperature classification

Understanding these markings helps engineers avoid incorrect product selection.

Common Mistakes When Understanding ATEX Zones

Based on practical industrial projects, several mistakes appear frequently:

• Treating all hazardous areas as the same
• Choosing lighting based only on wattage
• Ignoring gas group classification
• Forgetting temperature class requirements
• Installing equipment without checking certification

ATEX classification should always be completed before equipment selection.

FAQ: what are atex zones?

How many ATEX zones are there?

There are six main ATEX zones: Zone 0, Zone 1, Zone 2 for gases, and Zone 20, Zone 21, Zone 22 for combustible dust.

What is the difference between ATEX Zone 1 and Zone 2?

Zone 1 means an explosive atmosphere is likely during normal operation, while Zone 2 means it is only expected occasionally.

Is ATEX certification required for hazardous area lighting?

Yes. Lighting installed in ATEX classified areas must meet appropriate explosion protection requirements.

Can Zone 2 equipment be used in Zone 1?

No. Zone 1 generally requires a higher protection category than Zone 2 equipment provides.

Who defines ATEX zone classification?

The hazardous area classification is normally determined by qualified engineers based on process conditions, materials, and risk assessment.

Conclusion

what are atex zones is a critical question for anyone working with hazardous area equipment. ATEX zones define where explosive atmospheres may exist and determine the correct protection level for lighting and electrical products.

At SEEKINGLED, we focus on helping industrial customers select suitable explosion-proof lighting solutions based on real application conditions, certification requirements, and hazardous area classifications.

ATEX zones Explosion Proof Lighting

LO Series LED Linear Explosion Proof lighting

SEEKINGLED LED Linear Explosion Proof Light and Explosion Proof lighting is ATEX and IECEx certified for Zone 1, Zone 2, Zone 21 and Zone 22 hazardous locations, built for long-term industrial use.

View details

Bay51 Series LED Linear EX Proof lights

LED Linear Explosion Proof Lights and EX Proof lights for Zone 1, Zone 2, Zone 21 and Zone 22 hazardous areas. ATEX & IECEx certified explosion proof LED linear lighting with emergency function, adjustable power and IP67 protection by SEEKINGLED.

View details

FL8 Series Explosion Proof FloodLights

SEEKINGLED LED Explosion Proof Flood Lights are ATEX certified for Zone 2 and Zone 22 hazardous areas, offering high efficiency, adjustable power and integrated junction box.

View details

FL7 Series Explosion Proof Flood Lights

SEEKINGLED LED Explosion Proof Flood Lights are flameproof ATEX and IECEx certified for Zone 1 and Zone 2 hazardous areas, offering high power, adjustable output and long service life.

View details

GS Series LED Gas Station Canopy Lights

SEEKINGLED LED Gas Station Canopy Lights are ATEX certified for Zone 2 and Zone 22 hazardous areas, featuring adjustable power and built-in explosion-proof junction box.

View details

FL7 series EX street lights

ATEX： Ex II 2G Ex db IIB T6/T5 GbEx II 2D Ex tb IIIC T80°C/ T95°C Db IECEx Ex db IIB T6 Gb;Ex tb IIIC T80°C Db Feature： ● For Zone 1,2 and Zone 21,22● Flameproof type, the strongest● 100W can replace 250W HID,energy saving● Power：60W,80W,100W Application: Oil and gas, marine, Chemical, pharmaceutical, semiconductor,mining,military industr…

View details

FL8 series Explosion proof street light

ATEX： II 3G Ex nR ⅡC T5/T6 GcII 3D Ex tc ⅢC T80℃/T95℃Dc ATEX Certificate NO: TÜV CY 26 ATEX 0207611 X Feature： ● For Zone 2 and Zone 22● 150W can replace 250W HID lamps,Energy saving● Power：50W,75W,100W,150W,200W Application: Oil and gas, marine, Chemical, pharmaceutical, semiconductor,mining,military industry, paint booth,power plant ETC…

View details

HB21 Series Explosion Proof High Bay lights

LED explosion proof high bay lights are designed for Zone 1, Zone 2, Zone 21 and Zone 22 hazardous areas. This page introduces the HB21 Series from SEEKING, including certifications, power options and real application considerations.

View details

LU Series LED Linear Flame Proof lights

LED Linear Explosion Proof Lights from SEEKINGLED. LU Series Flame Proof lights ATEX-certified explosion proof LED linear lighting for Zone 2 gas and Zone 22 dust areas, IP69K, IK10, long lifetime and flexible power options.

View details

Explosion proof work lights

Certified explosion proof work lights for Zone 1 & 21 hazardous areas. Portable, ATEX & IECEx approved, built for oil, gas and chemical plants by SEEKINGLED.

View details

FL8 Explosion-proof portable work light

ATEX： II 3G Ex nR ⅡC T6 GcII 3D Ex tc ⅢC T80℃ Dc ATEX Certificate NO: TÜV CY 26 ATEX 0207611 X Feature： ● For Zone 2 and Zone 22● Accepts battery-powered supply● indestructible● Power：AC input:50W,75W,100WDC input:15W,25W,35W Application: Oil and gas, marine, Chemical, pharmaceutical, semiconductor,mining,military industry, paint booth,po…

View details

BAYD82 Explosion Proof LED Exit Light

ATEX： Ex II 2G Ex db IIB T6 GbEx II 2D Ex tb IIIC T80°C Db IECEx Ex db IIB T6 Gb;Ex tb IIIC T80°C Db Feature： ● For Zone 1,2 and Zone 21,22● Flameproof type, the strongest Application: Oil and gas, marine, Chemical, pharmaceutical, semiconductor,mining,military industry, paint booth,power plant ETC hazardous area. Technical Specifications:…

View details

BAJ52 Explosion proof Emergency Light

ATEX： Ex II 2G Ex db IIB T6 GbEx II 2D Ex tb IIIC T80°C Db IECEx Ex db IIB T6 Gb;Ex tb IIIC T80°C Db Feature： ● For Zone 1,2 and Zone 21,22● Flameproof type, the strongest Application: Oil and gas, marine, Chemical, pharmaceutical, semiconductor,mining,military industry, paint booth,power plant ETC hazardous area. Technical Specifications:…

View details

BT8 Series Explosion proof T8 Tube Light G13

ATEX： Ex II 2G Ex d e IIB T6 Gb ATEX： Ex d e IIB T6 Gb; Feature： ● For Zone 1,2● 9W can replace 18W fluorescent lamps,50% Energy saving Application: Oil and gas, marine, Chemical, pharmaceutical, semiconductor,mining,military industry, paint booth,power plant ETC hazardous area. Technical Specifications: Standards：60079-0, 60079-1, 60079…

View details