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Atex Marking

Atex Marking

Atex Marking

Can someone tell me what the difference between EEx and Ex is in the following context:

  II 2 G EEx de IIC or   II 2 G Ex de IIC

Have seen products that carry both marks.  I know EEx says the product complies with European standards, but wouldn't all Atex equipment comply with Euro. standards?  I am confused, please help.


RE: Atex Marking


The Ex markings that you have listed would be interpreted as applying to a piece of equipment that is marked as explosion protected using the marking system from the zone system of area classification. This could be used in North America or for any product under the IECEx scheme. The additional E in EEx however implies the use of a CENELEC standard and should be used on a product that is ATEX approved.

Are you sure that the Ex mark is on an ATEX approved piece of equipment?

Nick Scott

RE: Atex Marking

Would then the Ex apply to mechanical equipment, and EEx apply to electrical equipment under Atex?

Is there an EN standard that covers atex marking?  I have the directive and applicable product standards.  There seems to be little information contained in them as to how to mark the product.

RE: Atex Marking

The EEx marking was called out under the EN 50 series of standards. The newer EN 60 series of standards that are based on the IEC standards only call out the Ex mark. See the attached link for the ATEX document on marking. You can also reference EN 60079-0:2006 Electrical apparatus for explosive gas atmospheres - Part 0:General requirements for additional marking requirements.

Nick Scott

RE: Atex Marking

Thank you for your help.

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