Intrinsically Safe Knowledge Base
Class I Div 2 vs ATEX Zone 2: How the Ratings Compare
If a product page lists “Class I Division 2” and another lists “ATEX Zone 2”, it is natural to ask whether they mean the same thing. They come from two different classification systems. This guide explains how each one defines the hazard, where each is used, how equipment is marked, and what to check before you buy. It also shows the products in our catalog that state both ratings on their listing.
Quick Answer: Class I Div 2 vs ATEX Zone 2
- Class I, Division 2 belongs to the Class/Division system. Zone 2 belongs to the Zone system. They are separate designations in the US rules: 29 CFR 1910.307(a)(2) lists “Class I, Division 2” and “Class I, Zone 2” as different classifications.
- Each is the lower-hazard level inside its own system: Division 2 sits below Division 1, and Zone 2 sits below Zone 1 (29 CFR 1910.399). The wording of the definitions is different (see the table below), so do not treat them as one-to-one translations.
- For a gas location, a US installation may be classified under the division system or under the zone system (29 CFR 1910.307(a)(4)). The classification has to be documented (29 CFR 1910.307(b)).
- “ATEX” is the name the European Commission uses for its rules on equipment for potentially explosive atmospheres. The zone definitions used in the EU are in Directive 1999/92/EC, Annex I.
- A practical purchasing rule: pick equipment whose marking matches the system your site documentation uses. A listing that states both ratings uses both vocabularies, but still confirm it against your classification document.
Class/Division vs Zone: Side-by-Side
| Class I, Division 2 | Zone 2 (ATEX / Class I, Zone 2) | |
|---|---|---|
| System | Class/Division | Zone |
| Gas locations | Division 1 and Division 2 | Zone 0, Zone 1 and Zone 2 |
| Dust locations | Class II, Division 1 and 2 (29 CFR 1910.399) | Zone 20, 21 and 22 (Directive 1999/92/EC, Annex I) |
| Core idea of the level | Gas is normally confined in closed containers or systems, or normally prevented by positive ventilation (29 CFR 1910.399) | Ignitable gas is not likely in normal operation and, if it occurs, lasts only a short period (29 CFR 1910.399; Directive 1999/92/EC, Annex I) |
| US rules | 29 CFR 1910.307(c) to (f) | 29 CFR 1910.307(g) (Class I, Zone 0, 1 and 2 only) |
| EU rules | — | Directive 1999/92/EC (places) and Directive 2014/34/EU (equipment) |
| Equipment is selected by | Class, group and temperature (29 CFR 1910.307(c)(2)) | Equipment category 1, 2 or 3 for the zone (Directive 1999/92/EC, Annex II, Part B) |
Where Each System Is Used
United States. OSHA’s rule for hazardous (classified) locations covers both systems. In Class I locations, an installation is classified with the division system or with the zone system. In Class II and Class III locations, the division system is used (29 CFR 1910.307(a)(4)).
European Union. Directive 1999/92/EC, Annex I, classifies hazardous places in zones, based on the frequency and duration of an explosive atmosphere. It defines Zone 0, 1 and 2 for gas, vapour or mist, and Zone 20, 21 and 22 for combustible dust.
The classification document for your site is the reference point. Our related guides go deeper on each side: ATEX Zone 1 and Zone 2 certifications, Class 1 Division 1 vs Division 2 and ATEX vs IECEx.
Definitions: Division 2 and Zone 2
Class I, Division 2 (29 CFR 1910.399). Volatile flammable liquids or flammable gases are handled, processed or used but are normally confined within closed containers or closed systems, from which they can escape only through accidental rupture, breakdown or abnormal operation; or ignitable concentrations are normally prevented by positive mechanical ventilation; or the location is adjacent to a Class I, Division 1 location and gas might occasionally reach it.
Class I, Zone 2 (29 CFR 1910.399). Ignitable concentrations of flammable gases or vapors are not likely to occur in normal operation and, if they do occur, exist only for a short period. The definition also covers normally confined liquids or gases, locations kept clear by positive mechanical ventilation, and locations adjacent to a Zone 1 location.
ATEX Zone 2 (Directive 1999/92/EC, Annex I). A place in which an explosive atmosphere of a mixture of air with flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
For comparison, the higher-risk level. In a Class I, Division 1 location, ignitable concentrations of gases or vapors may exist under normal operating conditions or frequently because of repair, maintenance or leakage. In a Class I, Zone 1 location, they are likely to exist under normal operating conditions or may exist frequently for the same reasons (29 CFR 1910.399).
How to Read a Product Label: A Real Example
The Bartec BCS 3600 handheld barcode scanner in our catalog lists the following on its product page:
ATEX: “II 3G Ex ic IIC T4 Gc II 3D Ex ic IIIB T135 °C Dc IP 64”
CSA: “Class I Div 2 Groups A, B, C and D T4 Ambient temperature -20 °C to 50 °C”
— Bartec Handheld Barcode Scanner BCS 3600, product page
Here is what the main parts tell you, and where the meaning comes from. See the manufacturer’s certificate or datasheet for the rest of the ATEX string.
- “II” is the equipment group. Directive 2014/34/EU, Annex I, puts mining equipment in Group I and lists Group II separately.
- “3” is the equipment category. Directive 2014/34/EU, Annex I, describes category 3 as equipment intended for areas where explosive atmospheres are unlikely to occur or, if they do, are likely to occur only infrequently and for a short period.
- “G” and “D” are the letters for the type of atmosphere: G for gases, vapours or mists, and D for dust (Directive 2014/34/EU, Annex II, point 1.0.5).
- “CSA: Class I Div 2 Groups A, B, C and D T4” follows the Class/Division pattern. US rules require equipment approved for a hazardous location to be marked with its class, group and operating temperature or temperature range (29 CFR 1910.307(c)(2)(ii)).
For equipment marked under the zone system, 29 CFR 1910.307(g)(5)(ii)(B) lists the order of a US zone marking: class, zone, the symbol “AEx”, protection technique, gas group and temperature classification. Its example is “Class I, Zone 0, AEx ia IIC T6”.
How OSHA Treats Zone and Division Classifications
Many searches for “Zone 2 vs Div 2” ask whether one system can stand in for the other. The US rule text sets the following:
- One system per installation. An installation is classified under either the division system or the zone system (29 CFR 1910.307(a)(4)), and the classification is documented (29 CFR 1910.307(b)).
- Within the division system. Equipment approved for a Division 1 location may be installed in a Division 2 location of the same class and group (29 CFR 1910.307(e)).
- Within the zone system. Equipment listed for Zone 0 may be installed in a Zone 1 or Zone 2 location of the same gas or vapor, and equipment listed for Zone 1 may be installed in a Zone 2 location of the same gas or vapor (29 CFR 1910.307(g)(5)(i)).
- Marking. Under the zone paragraph, equipment approved for Class I, Division 1 or Division 2 must, in addition to its normal marking, carry the applicable Class I Zone 1 or Zone 2 marking, gas groups and temperature classification (29 CFR 1910.307(g)(5)(ii)(A)).
- Mixed sites. Class I, Zone 2 locations may abut, but not overlap, Class I, Division 2 locations. A Division 1 or Division 2 location may be reclassified into zones only if all of the space classified because of a single flammable gas or vapor source is reclassified (29 CFR 1910.307(g)(4)(ii) and (iii)).
- Who classifies. In the zone system, classification of areas and selection of equipment and wiring methods is done under the supervision of a qualified registered professional engineer (29 CFR 1910.307(g)(4)(i)).
- European rule for Zone 2. Unless the explosion protection document says otherwise, category 1, 2 or 3 equipment is used in Zone 2 or Zone 22 (Directive 1999/92/EC, Annex II, Part B), provided it is suitable for gases, vapours or mists and/or dusts as appropriate.
What this means in practice: the OSHA text does not translate one system into the other. It sets rules inside each system and a few rules for sites that use both. If a product is marked for only one system, check your site classification document and confirm with the engineer responsible for the area before buying.
Products We Sell with Both Zone 2 and Class I Division 2 Ratings
The listings below state both ratings on the public product page (checked on 2026-10-09). Quotes are copied from each page.
Xciel iPad 10.9″ 10th Gen Case – Zone 2, C1D2
“Certified for ATEX Zone 2 & Class I Division 2 (Groups A–D)” and “ATEX Rating: Zone 2 Class & Division: Class I, Div 2, Groups A, B, C, D Temperature Rating: Ta: -20°C to +50°C”
— product page
Xciel iPhone 16 Intrinsically Safe Case
“ATEX Zone 2 and Class I Division 2 (C1D2) certified intrinsically safe case for iPhone 16” and “Certification ATEX Zone 2, Class I Division II”
— product page
The same page answers the Zone 1 / Division 1 question directly: “No, this model is specifically certified for Zone 2 / Division 2 only. For higher-risk areas, a Zone 1 / Division 1 device is required.”
Bartec Handheld Barcode Scanner BCS 3600
Features: “ATEX Zone 2/22 CSA Class 1 Division 2”; ATEX marking “II 3G Ex ic IIC T4 Gc II 3D Ex ic IIIB T135 °C Dc IP 64”; CSA “Class I Div 2 Groups A, B, C and D T4”
— product page
Browse the full ranges here: Class 1 Division 2 mobile devices, intrinsically safe cases, intrinsically safe tablets and intrinsically safe scanners. Check the rating on each individual listing before ordering.
How to Choose
- Find the site classification document. US rules require the classification to be documented (29 CFR 1910.307(b)). Note whether it uses divisions or zones.
- Identify the gas or dust. Equipment must be approved for the class of location and for the specific gas, vapor, dust or fiber present (29 CFR 1910.307(c)(2)(i)).
- Check the temperature marking. The temperature marking may not exceed the ignition temperature of the specific gas or vapor (29 CFR 1910.307(c)(2)(ii)).
- Match the marking to the system. Look for the Class/Division wording, the Zone wording, or both, on the label and on the listing.
- Treat higher-risk areas separately. A Division 2 or Zone 2 rating does not cover Division 1 or Zone 1 areas. The Xciel iPhone 16 listing says so explicitly.
- Involve the responsible engineer for mixed or reclassified sites (29 CFR 1910.307(g)(4)).
- Talk to our sales experts. If your documents mention both systems, contact our team and compare the ratings on the listings above against your list.
FAQ
What is the difference between ATEX Zone 2 and Class 1 Div 2? They are different classification systems. Zone 2 is part of the zone system (used under ATEX in the EU and available for Class I locations in the US). Division 2 is part of the division system used in US rules. Each is the lower-hazard level in its own system, defined with different wording (29 CFR 1910.399; Directive 1999/92/EC, Annex I).
Is Class 1 Div 2 the same as ATEX? No. Class I, Division 2 is a US location classification. ATEX is the European Commission’s name for its framework on equipment for potentially explosive atmospheres. Its zone definitions are in Directive 1999/92/EC and its equipment rules in Directive 2014/34/EU.
Is Zone 2 equivalent to Division 2? The US rule lists them as separate classifications and allows Zone 2 locations to abut, but not overlap, Division 2 locations (29 CFR 1910.307(a)(2) and (g)(4)(ii)). This guide does not state an equivalence; see the OSHA section above.
What is the difference between Class 1 Zone 1 and Class 1 Div 1? Both are the higher-risk level of their system, with different wording (29 CFR 1910.399, summarized above). See our guide to Class 1 Division 1 vs Division 2.
What is the difference between zone and division? The zone system has three gas levels (Zone 0, 1, 2) based on frequency and duration of an explosive atmosphere (Directive 1999/92/EC, Annex I). The division system has two (Division 1 and 2; 29 CFR 1910.399). In the US, Class I locations may use either (29 CFR 1910.307(a)(4)).
Can I use a Zone 2 device in a Zone 1 area? The US rule text allows equipment listed for Zone 1 in a Zone 2 location of the same gas or vapor (29 CFR 1910.307(g)(5)(i)). It does not describe the opposite case. The Xciel iPhone 16 listing, for example, says it is certified for Zone 2 / Division 2 only and that higher-risk areas need a Zone 1 / Division 1 device.