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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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