Do you not know what the explosion-proof principles of explosion-proof electrical equipment are?

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1. The principle of flameproof electrical equipment is to place those parts that may generate sparks under normal operation or in case of accidents within one or several enclosures. These enclosures not only isolate the sparks and arcs inside from the explosive gases in the surrounding environment, but also prevent the enclosures from being damaged when the explosive gas mixture that enters them is ignited by those sparks or arcs, as well as stopping such ignition from spreading to the explosive gas mixtures in the surrounding area through any gaps in the enclosures. 2. Intrinsically safe electrical equipment is mining electrical equipment that does not generate arcs, sparks, or dangerous temperatures under normal operating conditions. 3. The explosion-proof principle of intrinsically safe electrical equipment is to achieve electrical explosion protection by limiting the discharge energy, which is done by restricting the electrical parameters of the circuit (specifically, circuits in which electrical sparks and thermal effects generated under normal operating conditions or specified fault conditions cannot ignite the specified explosive mixture under prescribed test conditions). 4. The explosion-proof principle of positive-pressure electrical equipment is to place the electrical equipment within a housing, fill the housing with a protective gas, and maintain a pressure of this protective gas higher than that of the explosive environment surrounding it; this prevents external explosive mixtures from entering the housing, thereby achieving explosion protection for the electrical equipment. 5. The explosion-proof principle of oil-filled electrical equipment is to immerse all or some of its components in oil, so that arcs and sparks generated in the event of a fault cannot ignite the explosive mixture above the oil surface or outside the enclosure. 6. The explosion-proof principle of sand-filled electrical equipment is to fill the enclosure of the electrical equipment with quartz sand, burying the device’s conductive components or live parts beneath this quartz sand material. This prevents arcs that may occur within the enclosure, flames that might spread, as well as temperatures on the enclosure walls or the surface of the quartz sand from igniting any explosive mixtures present in the surrounding area, under specified conditions. 7. The explosion-proof principle of spark-free electrical equipment is that, under normal operating conditions, no faults that could cause ignition occur. 8. The explosion-proof principle of encapsulated electrical equipment is to encase in an encapsulating material those components of the electrical equipment that could generate arcs, sparks capable of igniting explosive mixtures, or high temperatures, thereby preventing these electrical components from coming into contact with explosive mixtures. This ensures that the electrical equipment cannot ignite the surrounding explosive mixtures, whether under normal operation or in approved conditions of fault or overload. 9. The explosion-proof principle of a hermetically sealed electrical device is that the electrical equipment or components are placed within a hermetic enclosure, which prevents external flammable gases from entering the enclosure. 10. The explosion-proof principle of special electrical equipment is as follows: it differs from the explosion-proof principle of existing explosion-proof equipment, but it has been proven to possess explosion-proof properties through testing by **recognized testing institutions.