The inlet of the explosion-proof motor junction box is sealed by pressing the rubber ring. The weakness of this structure is the aging of the rubber ring and the elastic failure, which makes the cooperation between the cable and the rubber ring inconsistent. For the junction box of the double outlet of the explosion-proof motor, the unnecessary outlet should be blocked with a metal sealing piece of thickness not less than 2mm. The outer diameter of the metal sealing piece should be close to the inner diameter of the outlet hole of the inlet and outlet device, so as to ensure that the sealing ring is evenly pressed by the pressure plate or the pressing nut to achieve a reliable seal.

One of the main causes of various failures of explosion-proof motors is damp insulation. For example, in Lviv-Wolensk coal mine, a day and night output of more than 1000 tons of palm scraper conveyor motor motor, due to damp and motor cavity water droplets caused by the stator winding insulation resistance decreased and the failure of 45.7 percent of the total number of faults.

Electrical equipment with enclosed structures is in many cases insufficient to protect it from adverse weather factors. Therefore, there should be some special devices in the shell of the explosion-proof motor to ensure that the weather conditions can be improved. It shall include an air humidity regulating device, which is used to reduce the relative humidity and humidity of the air in the explosion-proof motor, and the occasional falling moisture is excluded from the housing and prevented from inhaling moisture through the bearing and sealing ring.

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