Material requirements for the flameproof enclosures of mining equipment

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Material for the flameproof enclosures of Class 1 electrical equipment: 1. The enclosures of electrical equipment used in mining and excavation operations (including electrical equipment mounted on machines such as coal miners, excavators, rock loaders, and conveyors) must be made of steel plates or cast steel. Other components or enclosures that are not exposed to external impacts after assembly, and whose volume is no more than 2000 cubic centimeters, can be made of gray cast iron with a grade of at least HT2500. However, except that the motor frame must be made of steel plate or cast steel, other components can also be made of HT250 gray cast iron. 2. The casings of electrical equipment used in non-mining work areas may be made of gray cast iron with a grade of not lower than HT250. 3. The casings of electrical equipment designed for use in chambers are not subject to the restrictions specified in point 2. 4. When the volume of the enclosure is not more than 2000 cubic centimeters, it is advisable to use non-metallic colored ring tones; however, it is not allowed to have threads solely for fastening on the non-metallic enclosure (except at the cable outlet)