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Installing Electronics within Ex e enclosure for Zone 2 Area

AlexMack
I'm building an instrumentation system for use in Zone 2 Hazardous Areas and want to install electronics within an enclosure to process the sensor(s) data. The electronics enclosure I want to use is built and certified Ex e.


I understand Ex d enclosures housing non-Ex rated electronics must be designed and certified "as-built" by an approved manufacturer or notified body.  


Can anyone advise on the following:
  1. Does the system still conform to ATEX / Ex standards if all electronics installed within the Zone 2 rated Ex e enclosure are also Ex rated minimum Zone 2 (e.g. all are ExnA)?

  • Can Ex nA electronics even be installed within a non-Ex (just Stainless Steel) encsloure with the right design parameters?

  • If I am supplying the enclosure with 24VDC power feed and RS485 comms ...do these feeds need to be intrinsically safe i.e. barrier protected to minimum Ex ib, or would over-current protection fuses suffice?


Thanks in advance
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    I will start off with a disclaimer as anything commented on this forum is based on the understanding gained from your post and may not be fully correct for the situation you have.


    Having said that, you need to look at the whole installation and not just the individual parts. I am not sure what you mean by an 'Ex e' enclosure as the enclosure of itself doesn't have any electrical parts, but presume that it means an enclosure which if Ex e equipment was installed within would meet the Ex e requirements (such as IP rating, etc.). If you install Ex nA electronics within it then it will no longer be considered Ex e. I would also add that my understanding is that Ex nA electronics could be installed in a non-Ex enclosure but the enclosure would need to comply with the relevant part of IEC 60079.


    I would suggest you probably need to discuss this in full detail with somebody who understands the ATEX Directive/DSEAR Regulations to make sure you are fully compliant.
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  • 0
    I will start off with a disclaimer as anything commented on this forum is based on the understanding gained from your post and may not be fully correct for the situation you have.


    Having said that, you need to look at the whole installation and not just the individual parts. I am not sure what you mean by an 'Ex e' enclosure as the enclosure of itself doesn't have any electrical parts, but presume that it means an enclosure which if Ex e equipment was installed within would meet the Ex e requirements (such as IP rating, etc.). If you install Ex nA electronics within it then it will no longer be considered Ex e. I would also add that my understanding is that Ex nA electronics could be installed in a non-Ex enclosure but the enclosure would need to comply with the relevant part of IEC 60079.


    I would suggest you probably need to discuss this in full detail with somebody who understands the ATEX Directive/DSEAR Regulations to make sure you are fully compliant.
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