Regarding the sealing of electrical protection sleeves
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In areas prone to explosions, cables should be laid underground, and metal sleeves should be used to protect them at the points where they emerge from the ground. There is disagreement among experts regarding whether an explosion-proof seal is necessary at these exit points, and no clear regulatory requirements exist in this regard.
It’s not necessary; only wire and steel pipe wiring requires explosion-proof sealing. Moreover, it cannot be exposed directly inside the motor – an explosion-proof flexible tube must be used. Just plug it with a sealing filler. The purpose of the cable distribution steel pipe is to protect the cables from mechanical damage; it’s mentioned in the catalog.
Could you please provide the name of the specific atlas or share it? Thank you.
12D401-3 Installation of Electrical Circuits and Electrical Equipment in Explosive Hazardous Environments