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ATEX group, category, zone and Ex marking: compare the actual use
Keep workplace zones, equipment categories, gas/dust suitability and operating limits distinct when selecting equipment.
Read the different classifications correctly
Equipment groups and categories under 2014/34/EU describe intended application and required protection levels. Workplace zones under 1999/92/EC are assigned through the responsible employer’s assessment of explosive-atmosphere frequency and duration. A category number is not a zone classification, and neither number alone establishes the complete equipment suitability.
Compare the full marking, gas/dust indication, instructions, certificate conditions where relevant and actual ambient/process limits. Technical protection markings need the relevant normative and product evidence; do not infer a protection type from a catalogue photograph. Gas suitability cannot silently establish dust suitability merely because a category number looks familiar.
Hypothetical case: gas-marked instrument for dust
A purchaser selects a gas-marked instrument for a dust location because the category number appears to match. The workplace hazard brief, temperatures and ambient conditions are incomplete. Obtain the responsible workplace assessment, actual substance/use information, full plate, issued conditions and instructions before judging the selection.
Keep the selection unresolved until the gas/dust and operating-limit comparison is supported. Do not relabel the product, assign an unknown zone or assume that a higher-looking number supplies missing protection evidence. Identify the responsible technical parties and what missing information is needed for a reasoned suitability decision.
Use the category relationship with its conditions
The workplace framework provides category-selection relationships subject to the explosion-protection document and appropriate gas/vapour/mist/dust suitability. Its ordinary relationship is category 1 for zones 0/20, categories 1 or 2 for 1/21, and 1, 2 or 3 for 2/22. This relationship does not replace the rest of the risk assessment, installation requirements or product operating conditions.
Kayra can organise the marking-to-use comparison and requests for missing records. The employer keeps workplace duties and the manufacturer keeps product conformity; this support service does not certify an unknown installation. The next step is the actual hazard and product-condition comparison, without a promise that matching one category number clears the selection.
Related product guides
- ATEX product conformity: intended use, ignition risks and equipment scope
- Choose ATEX support: defined technical work and notified-body tasks
- ATEX technical documents: revisions, risk evidence and production records
- ATEX costs and timing: variants, procedure and production work
- Check ATEX documents: authenticity, scope, variants and conditions
- ATEX changes and surveillance: type additions versus production follow-up
- ATEX assessment process: ignition evidence and manufactured configuration
- When ATEX applies: intended function, location and justified exclusions
- ATEX questions: component evidence, assemblies and workplace use
- ATEX application workflow: protection function, evidence and release
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For “ATEX group, category, zone and Ex marking: compare the actual use”, share the current product model, actual function, intended gas/dust use and available records. The agreed technical scope determines further evidence needs.