Among the main functions of the control of an electric motor we have the item “mechanical protection” that is classified into three categories: drip and splash proof, fully enclosed and explosion proof.
Drip and splash proof motor – all rotating parts, or under tension, are protected against dripping water from all directions, not allowing the direct or indirect entry of drops or particles of liquids or solid objects that spill or motor.
Fully enclosed motor – This type of motor is so enclosed that there is no exchange of the cooling medium between the outside and the inside of the enclosure, and is not necessarily leakproof. Depending on the required characteristics, such electric motors may or may not have fan for cooling.
Explosion proof motor – Motors are built for service in environments saturated with gases and dust, susceptible to the danger of rapid ignition, and can not cause the same, either by means of spark or by high heating. Its enclosure resists explosions of explosive gases or explosive mixtures specified therein, and prevents a surrounding flammable atmosphere from being ignited. https://www.mrosupply.com/motors/ac-motors/general-purpose-motors/2840781_vel11304_baldor/