Explosion-Proof Cameras for Zone 1 and Zone 2: ATEX vs IECEx Explained

An explosion-proof camera is chosen by the hazardous-area classification of the place where it will hang, not by the camera brochure. Zone 1 and Zone 2 set the equipment protection level the camera needs. ATEX and IECEx are two different ways of proving it. This guide shows how to read the marking on the label, how the two schemes compare, and what to check in the certificate before a model goes into the design.

Short answer: For a gas Zone 1 area, look for equipment protection level Gb (or Ga) in the marking. For Zone 2, Gc is the minimum, and Gb equipment can also be used there. Then confirm the gas group (IIA, IIB or IIC) and the temperature class against the site's area classification, and ask for the certificate that matches the exact model.

What Zone 0, Zone 1 and Zone 2 mean

Hazardous-area zones describe how often an explosive atmosphere may be present. The classification is made by the site owner or their safety engineer, usually following IEC 60079-10-1 for gas and IEC 60079-10-2 for dust. The camera supplier does not decide the zone. The supplier matches equipment to it.

Most CCTV positions on an oil or gas site sit in Zone 1, in Zone 2, or in a safe area that looks into them. Cameras are rarely placed inside Zone 0. Where a camera can sit outside the zone and still see the target, that is often the simpler design.

The real area-classification drawing for the site is the reference. A camera schedule should list the zone for every position, so each model can be checked one by one.

How to read an Ex marking on a camera

The marking on the label and in the certificate is the fastest way to see where a camera may be used. Take one marking published for a Rongfang infrared explosion-proof camera in our product catalog:

Ex d IIC T6 Gb / Ex tD A21 IP68 T80°C

A Wardmay stainless-steel camera in the same catalog publishes a marking in the European style:

II 2G Ex db IIC T6 Gb, II 2D Ex tb IIIC T85°C Db

Here, II 2G is the ATEX group and category: Group II (surface industries, not mining), Category 2, gas. Category 2 corresponds to Zone 1. db is the current way of writing a flameproof enclosure. IIIC is the most demanding dust group, which covers conductive dust.

Some handheld devices use a different concept. A Delinnovation explosion-proof camera in the catalog lists Ex ib IIC/IIB T4 Gb. Here, ib is intrinsic safety: the circuit energy is limited so it cannot ignite the atmosphere. T4 means the surface temperature stays at or below 135°C. A Rongfang PTZ dome lists Ex d [ia Ga] IIC T6 Gb. The square brackets show an associated intrinsically safe circuit inside a flameproof housing.

Protection concepts you will meet in CCTV

Zone 1 vs Zone 2: what changes in the camera choice

The main difference is the minimum protection level. Zone 1 needs Gb or better. Zone 2 needs Gc or better. A camera marked Gb can therefore be used in both, which is why many projects standardize on Zone 1 models across the site.

Three more checks apply in both zones:

• Gas group. The camera group must be equal to or higher than the group in the area classification. IIC covers IIB and IIA. IIB does not cover IIC.
• Temperature class. The camera T-class must be safe for the auto-ignition temperature of the gases present. T6 is the most conservative class. T4 is enough only where the gases allow it.
• Ambient temperature range. The certificate states the ambient range the marking is valid for. Desert sun, enclosure heating and cooling options all need to stay inside it.

For Zone 2, a lighter protection concept may be allowed, for example "n" or "ec" types, if the model is certified that way. Whether that is worth it depends on the project. Mixing Zone 1 and Zone 2 models adds spares and documentation. One Zone 1 model family keeps the schedule simpler.

ATEX vs IECEx: what is the difference

ATEX and IECEx both test equipment against the same technical family of standards, IEC 60079 (published in Europe as EN IEC 60079). The difference is the legal and administrative frame around the test.

In practice, a model may hold an ATEX certificate, an IECEx certificate, both, or a national certificate instead. Some factory pages in our catalog list certificate numbers from other certification bodies next to the marking, so the scheme behind each number needs checking. Which scheme a site accepts is set by the operator's specification, the tender or the local authority. Check that before choosing the model, not after.

Neither scheme is "stronger" in a technical sense. Both rely on the same standards. The practical questions are simpler: does the site specification ask for ATEX, IECEx or another scheme? And does the certificate cover the exact model, marking and ambient range?

How to check an explosion-proof camera certificate

A marking printed on a datasheet is a claim. The certificate is the evidence. Before a model goes into the design, check:

1. Model match. The certificate lists the exact model or model family on the order, including variants such as lens, heater or housing material.
2. Marking match. The Ex code on the certificate matches the label and the datasheet.
3. Holder. The certificate is issued to the manufacturer. A distributor or integrator cannot hold it in their own name for someone else's product.
4. Validity. For IECEx, search the certificate number in the online system and check its status. For ATEX, check the certificate number and the Notified Body named on it.
5. The "X" suffix. A certificate number ending in X means there are specific conditions of use. Read them. They often cover cable entry, cleaning, or the ambient range.
6. The "U" suffix. A certificate ending in U is for a component, not for complete equipment. A camera module certified as U still needs a certified enclosure system around it.
7. Installation parts. Cable glands, conduits, stopping boxes and junction boxes must also be certified for the zone. Installation then follows IEC 60079-14 or the local code the site uses.

At ExCCTV, the proposal includes the original manufacturer's certificate for the exact model selected. That certificate is issued to the factory, and we collect it with the project documents. We are a system integrator, and the camera hardware and its certificates stay with the original manufacturers.

What else the design needs beyond the camera

The Ex rating keeps the camera from becoming an ignition source. It does not by itself make the surveillance useful. On oil and gas sites, the rest of the system is where most of the design work sits:

• Positions and coverage. Place cameras so that each one has a clear job: perimeter, wellhead, loading bay or process unit. See how this looks in oilfield surveillance and gas station security.
• Materials for the climate. Stainless-steel 304 or 316L housings are published in the catalog for corrosive and coastal sites. Choose the material for salt, dust and heat as well as for the zone.
• Network and power. Fiber routes, industrial switches and cabinets in the safe area need planning. See desert and coastal site networks.
• Control room and analytics. The video has to land in a control room and VMS that operators can run, with AI video analytics where it helps.
• Documentation. A device schedule with the zone, the marking and the certificate for each position. This is part of our system design work.

A short checklist before you order

• The area-classification drawing is available, and each camera position has a zone.
• The marking EPL is Gb or Ga for Zone 1 positions, and at least Gc for Zone 2.
• The gas group and T-class cover the gases on site. The dust marking is present if the area is dust-classified.
• The ambient temperature range on the certificate covers the site's conditions.
• The certificate scheme (ATEX, IECEx or national) is the one the site specification asks for.
• The certificate matches the exact model, and any "X" conditions are understood.
• Glands, conduits and junction boxes are certified for the same zone.
• The device schedule and certificates are kept together with the project documents.

FAQ

Can a Zone 1 camera be used in Zone 2?

Yes. Equipment with protection level Gb is suitable for Zone 1 and Zone 2, as long as the gas group, temperature class and ambient range also fit the area. The reverse is not true: Gc equipment is not suitable for Zone 1.

Is ATEX or IECEx better for an explosion-proof camera?

Neither is better technically, because both use the IEC 60079 standards. ATEX is mandatory for the EU/EEA market. IECEx is an international system, and its acceptance depends on the country and the project. Follow the scheme that the site specification or the local authority asks for.

What does Ex d IIC T6 Gb mean?

It describes a flameproof-enclosure device (d) for the most demanding gas group (IIC), with a maximum surface temperature of 85°C (T6), at protection level Gb, which suits Zone 1 and Zone 2.

Can a camera go into Zone 0?

Zone 0 needs equipment protection level Ga. Most flameproof CCTV cameras are marked Gb, so they are not for Zone 0. A common approach is to place the camera outside Zone 0 and view the area from there. Confirm it with the site's safety engineer.

Does ExCCTV issue ATEX or IECEx certificates?

No. ExCCTV is a system integrator, not a camera manufacturer. Certificates are issued to and owned by the original manufacturers. The proposal includes the manufacturer's certificate for the exact model selected.

How do I verify an IECEx certificate?

Search the certificate number in the public IECEx online certificate system at iecex.com. Check the status, the holder, the model list and the marking, and read any specific conditions of use.

Next step

Send the area classification, the camera positions and the scheme your specification asks for. We will match original factory models from the product catalog to each position and return a device schedule with the certificates for review. Contact us to start.