How to obtain explosion-proof certification
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To create a PLC-controlled system, the electrical components are placed inside explosion-proof enclosures, and the connection wires are secured and sealed using gland fittings, thereby meeting the explosion-proof requirements. However, can the explosion-proof certification for the entire device be provided by the manufacturer of those explosion-proof enclosures?
My friend is in charge of handling explosion-proof certification; you can consult her. I work in the field of explosion-proof lighting fixtures.
We have also been paying attention to issues in this area recently
For this PLC system, it is necessary to obtain explosion-proof certification for the entire equipment. Manufacturers of explosion-proof enclosures can only issue certification documents for those enclosures; to get overall certification, all the electrical components must also have explosion-proof certification.
These are clearly two different products. The explosion-proof enclosure manufacturers only obtain certificates for the empty shell, and these do not include the electrical components inside it. You buy it, put things inside it, and connect the wires; in terms of structure and function, it is no longer the same as the original hole cover, so it needs to be re-certified. You can think about it the other way around too: if that were possible, everyone would start producing flameproof enclosures, as they would be universal solutions.