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ATP Distinguishing Marks and Certification Plates: How to Read and Verify Them
A practical field guide to ATP class marks, expiry information, certification plates, equipment identity and the checks that should accompany visual markings.
25 August 2026 · Technical Insights
KEY TAKEAWAY
An ATP mark is a fast field identifier, not a substitute for technical traceability. The mark, plate, certificate and actual equipment configuration should all describe the same approved equipment.
IN THIS GUIDE
1. What the distinguishing mark tells you
ATP distinguishing marks allow an equipment class to be recognized quickly. The code communicates the equipment category, insulation classification and temperature class using the notation defined in Annex 1.
Examples such as FNA or FRC are therefore technical classifications rather than brand or model names.
Read the mark as a summary of demonstrated capability, then verify the evidence behind it.
2. Class code and equipment capability must agree
A visible code should make sense for the physical equipment. A mechanically refrigerated mark should correspond to the installed thermal appliance and the body insulation category.
If the installed configuration has changed since certification, the mark alone cannot establish that the current equipment remains within the approved basis.
3. Expiry information matters
ATP distinguishing marks include validity information associated with the certification period. The date is an immediate operational cue that should be checked before international carriage.
A clean, legible mark with an expired validity date does not create current conformity.
Legibility is useful; validity is essential.
4. What the certification plate adds
Where a certification plate is used under the ATP system, it provides structured identification linked to the approved equipment. It supports faster verification of status but should remain traceable to the official certificate and underlying records.
Do not treat the plate as an independent approval detached from the equipment identity.
5. Identity is the foundation of verification
Serial number, body identification, manufacturer information and other identifying data should allow the physical equipment to be matched to its certificate and approval evidence.
A valid document for a different body or a previous configuration does not solve an identity mismatch.
6. Changes can make markings misleading
Replacement refrigeration units, major body repairs, new doors, openings or other significant modifications may change the technical basis that supported the class.
The correct response is a documented technical assessment and, where necessary, review through the competent-authority or testing-station route rather than simply retaining the old mark.
7. A practical roadside or fleet check
A useful fleet check combines what can be seen on the equipment with what is held in the document system.
Read the complete class mark and validity information.
Match the plate and certificate identity to the physical equipment.
Confirm that the installed thermal appliance matches the recorded configuration.
Look for body modifications or repairs that may affect the approval basis.
Check the current certificate and periodic-conformity status.
8. Common marking mistakes
Typical errors include assuming the mark itself is the certificate, reading one letter incorrectly, overlooking expiry, or failing to reconcile the installed unit with the documented unit.
Another mistake is to repaint or replace markings after repair without first confirming that the technical status remains valid.
Engineering perspective
For fleet management, treat the external mark as the front end of a traceability system. A QR-enabled internal record or asset database can connect class, certificate, plate, serial numbers, unit configuration, modifications and next conformity date without changing the official ATP markings.
Primary references
The ATP Agreement and its Annexes are the primary legal reference. Handbook comments support interpretation and harmonization but are not legally binding on Contracting Parties.
Related Technical Guides
Need technical guidance?
ATP Compliance provides independent engineering guidance on ATP classification, testing strategy, technical evidence and compliance readiness for temperature-controlled transport equipment.
ATP Compliance is an independent technical information and advisory platform and is not affiliated with UNECE, national competent authorities or official ATP test stations.
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