How are proper explosion-proof documentation requirements and management handled?

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Regarding the specifications for explosion protection, as no in-depth research has been conducted, it’s based more on the client’s intuitive understanding of the equipment to be used. When making the purchase, explosion protection requirements are specified, and the electrical equipment comes with markings indicating that these requirements have been met; however, it usually does not come with an explosion protection certification. So the question arises: 1. For devices of the same type that are required to meet certain explosion-proof ratings, does the manufacturer need to obtain an external explosion-proof certification to get the corresponding approval certificate? Or do manufacturers just produce products according to certain standards to meet their own internal explosion-proof requirements? 2. As I understand it, for a certain type of equipment, one explosion-proof certification is sufficient; for example, for motors of the same model. As for control cabinets, many of them are customized according to the specific conditions on site, and their internal circuits vary. Is an explosion-proof certification required for each one of them? 3. Is it required that the manufacturer provide the owner with the corresponding explosion-proof certification, and does the owner have to keep such certifications? 4. Is there any corresponding national standard or specification to support all of this?