1.2. Increased safety electrical equipment will not produce arcs, sparks or high temperatures that can ignite explosive mixtures under normal operating conditions. Measures are taken to improve safety margins to prevent arcing, sparks or arcing under normal and recognized overload conditions. High temperature electrical equipment with the symbol "e"
Explosion-proof type: flameproof type mark: d
Explosion protection principle: When the equipment is in normal operation, the component that can generate spark arc is placed in the flameproof enclosure. The explosion-proof enclosure can withstand the internal explosion pressure without damage, and can ensure that the internal flame gas passes through the gap and the energy is reduced. It is not enough to detonate the gas outside the shell.
Explosion-proof type: Increased safety mark: e
Principle of explosion-proof: In the normal operation, no arc, spark and dangerous high temperature will be generated, and further protection measures are taken on the structure to improve the safety and reliability of the equipment.
Explosion-proof type: Positive pressure sign: p
Principle of explosion protection: Keep the pressure of the internal protective gas higher than the ambient pressure so that the explosive mixture does not enter the enclosure or a sufficient amount of protective gas passes through the enclosure, so that the concentration of the internal explosive mixture falls below the lower explosion limit.
Explosion-proof type: Intrinsically safe sign: i
Principle of explosion protection: Under the circumstance that the internal circuit of the device is under the specified conditions, the EDM and thermal effects produced under the normal operation or the specified fault condition cannot ignite the explosive mixture.
Explosion-proof type: Sealed type mark: m
Explosion protection principle: It will likely produce arcs, sparks, or high-temperature partial encapsulations that ignite the explosive mixture so that it cannot ignite the surrounding explosive mixture.
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