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My project has hazardous area classification as "IIA, IIB - Zone 2 - T3".
I know that just like IIC certified equipment can be used for IIB and IIA. Is there any similar hierarchy for protection.
Actual problem is that our project enclosure rating is Ex'd but one vendor has supplied us Ex'nl enclosure rating. Now i am asked to check if Ex'nl is OK to be installed instead of Ex'd.
I cannot find any basis for such requirement. I think if i can get any hierarchy for Ex rating the problem can be solved.
Please help.
Thanks.
I know that just like IIC certified equipment can be used for IIB and IIA. Is there any similar hierarchy for protection.
Actual problem is that our project enclosure rating is Ex'd but one vendor has supplied us Ex'nl enclosure rating. Now i am asked to check if Ex'nl is OK to be installed instead of Ex'd.
I cannot find any basis for such requirement. I think if i can get any hierarchy for Ex rating the problem can be solved.
Please help.
Thanks.