ATEX vs IECEx vs NEC: What's the Difference?

If you work in oil and gas, chemical processing, or any industry where explosive atmospheres are a daily reality, you've almost certainly seen these acronyms: ATEX, IECEx, NEC.

They appear on equipment labels, procurement checklists, and compliance documentation. But they don't mean the same thing, and confusing them can create gaps in your hazardous location safety programme.

Here's what you actually need to know..

What Is ATEX?

ATEX comes from the French "ATmosphères EXplosibles" and refers to two separate European directives that cover different parts of the safety chain.

ATEX 114 (2014/34/EU) is a product directive. It sets out what manufacturers must prove before their equipment can legally be sold within the European Economic Area. This covers all potential ignition sources: sparks, hot surfaces, static discharge. If a product carries ATEX certification, it has been assessed against these requirements before reaching the market.

ATEX 137 (1999/92/EC) is the workplace directive. This one falls on employers, not manufacturers. It requires site operators to classify areas where explosive atmospheres can occur into hazard zones, then select equipment that matches those zones. In the UK, this is implemented through DSEAR (the Dangerous Substances and Explosive Atmospheres Regulations).

In practice: ATEX certification on a device tells you it has met the product standard. Your site's zone classification tells you whether that device is appropriate for your specific location.

For mobile devices used in hazardous areas across Europe, ATEX compliance is not optional. It's a legal requirement. This is why an ATEX phone or an ATEX phone case matters: the device itself, including any accessories, must meet the directive if it's being used in a classified zone.

What Is IECEx?

IECEx (International Electrotechnical Commission Explosive) is a voluntary international certification scheme. Where ATEX is mandatory within Europe, IECEx is designed for global trade.

It's built on the IEC 60079 series of standards and issues a single Certificate of Conformity that manufacturers can use across multiple markets. The idea is to avoid the same equipment being tested repeatedly in different countries under different schemes. One certificate, verified once.

IECEx also runs a publicly accessible online database where certificates and test reports can be checked. That transparency matters for procurement teams and safety managers who need to verify what they're actually buying.

Several countries outside the EU, including Australia, require IECEx or treat it as a primary reference. In the Middle East and elsewhere, it's often used alongside local approvals. If your organisation operates across borders, IECEx certification gives you the widest international coverage.

For mobile devices, carrying both ATEX and IECEx certification means a single device can be deployed across a multinational operation without sourcing separate country-approved alternatives. An IECEx phone or certified case gives procurement teams one less compliance headache when equipping workers across different regions.

What Is NEC (and CEC)?

North America runs on a different system entirely. The United States uses the National Electrical Code (NEC); Canada uses the Canadian Electrical Code (CEC). Both have historically relied on a Class and Division approach to hazard classification.

Under this system:

• Class I covers flammable gases and vapours
• Class II covers combustible dusts
• Class III covers ignitable fibres or flyings

Within each class, Division 1 means the hazard is present under normal operating conditions. Division 2 means it only appears under abnormal conditions. This distinction matters because Division 1 locations require more stringent equipment ratings.

The NEC has since introduced Articles 505 and 506, which allow the Zone system (used by ATEX and IECEx) as an alternative. This gives more flexibility and a closer alignment with international standards, but implementation still requires sign-off from local Authorities Having Jurisdiction (AHJs). It's not a simple swap.

The practical takeaway for anyone sourcing equipment for North American sites: ATEX and IECEx certification alone is not sufficient. You'll need to confirm the device also meets NEC Class/Division requirements, or that the Zone-based equivalent has been accepted by your AHJ.

How Do These Three Relate to Each Other?

They're not mutually exclusive. Many products, including explosion proof phone cases designed for global deployment, carry both ATEX and IECEx certification. North American compliance is handled separately through the NEC/CEC framework.

Why All Of This Matters for Mobile Devices

Smartphones are increasingly part of the working environment in hazardous locations. They're used for comms, documentation, inspection apps, and lone worker monitoring. That makes the device you carry just as subject to explosion protection requirements as the fixed equipment around it.

An uncertified phone in a Zone 1 or Division 1 area is a compliance failure. More importantly, it's a potential ignition source in an environment where that risk carries serious consequences.

Choosing an ATEX or IECEx phone case (or dedicated device) that has been properly certified is how you keep your firm safe and consistent with the rest of your hazardous area safety programme.

To learn more about Xshielders ATEX Zone 1/21 certified cases, get in touch with us here.