I have an old EX d enclosure need to be replaced. is there any problem to order new one and put the old components on it?

replacing the damaged Ex d enclosures. it seems easy but according to IEC "components not to be removed from flameproof equipment. is there a solution to replace the enclosures without ordering new internal components?

also we need to know the same precautions for replacing EX e enclosures?

 

If the enclosure was original equipment supplied by a vendor with components already installed, you should contact the vendor for advice.

Otherwise, you should contact the governmental organization that covers such standards (in the US and Canada and Germany, these are not governmental organizations, but approved national testing labs such as FM, UL CSA and TUV).

Good luck.
Walt Boyes

Walt Boyes, Life Fellow, ISA; Fellow InstMC
Chartered Measurement and Control Technologist
Spitzer and Boyes LLC

 

Hi ibrahim

In fact if the enclosure was originally certified Exd by third party agency, You are allowed to reorder or modify internally in case of anything wrong inside the enclosure. Differently, the Exe (Increase Safety) enclosure is designed based on the strict requirement on construction therefore you are not entitled to change or modify internally without agreement of manufacturer.

In other word, if you want to change by new one, you should contact with supplier and verified the exploration certification again

Good Luck
Hoa Thaivan

 

Sorry - but this advice is not correct.

Under IEC rules, a bare Ex d enclosure will be certified as a "component". This will be shown by the certificate number having a U as suffix.

Before it can be used, the enclosure will need to be re-certified with its contents as supplied for the final application. This will include all internal terminals, partitions, etc. YOU ARE NOT ALLOWED TO MODIFY THE ENCLOSURE IN ANY WAY UNLESS SPECIFICALLY PROVIDED FOR IN THIS SECOND CERTIFICATION.

Possible issues are:

- adding elements may make the temperature rating void.

- rearranging components internally may create possible pressure piling because of restrictions allowing the build-up of combustion products.

Ex e Increased Safety enclosures can be modified provided that the modifications use only Ex e components, and that the internal power dissipation limit is not exceeded - but again unless you know what you are doing it is not recommended.