The main function of ex d enclosure is to stop any internal explosion from spreading into the enclosure. There can be fire due to various reasons such as moisture, dust, water or dirt on the fixtures and ex d enclosure protects these fixtures from these environmental influences also. It means that it is mainly designed to resist any internal explosion.
While using the ex d enclosure while fixing the electrical apparatus, engineers need to see if the ex d enclosure is a certified equipment before and after installing it. For certified and quality ex d enclosure contact Supermec.