ground lug and ground wire in class1 div2 enclosure
Robert,
I did read the articles you mentionned. A lot of it is straightforward recommendations. When it comes to class1 ( div1 and 2) there are recommendations about components ( glands, enclosures, etc..) but not a lot about systems. Now the main difference between nema4x and class1 div2 is the ability for the latter to offer a shield from eventual gases under abnormal conditions., where 4x provides insulation from corrosives atmospheres, amongst other things. Now, there are no control panels that are rated class1 div2 unless all the components are either IS or class1 div2 rated, and yes the rating of the enclosure has to be approved for such environments. In my project, the selector switches ( Allen bradley, 880H series), the breakers (Stahl), cables (MC-HL), cable glands (C1 D2) are all rated class1 div2. The control panel is to be located on an offshore platform, thus the required rating. Most people avoid this by simply purchasing a very expensive class1 div1 enclosure and throwing in unrated components.
One final note, in the US the ATEX rating is useless. But if you do business worldwide, class1 div2 and sometimes class1 div1 is not accepted, especially in Europe . ATEX is required there.
I thank you for you help and your interesting comments.