According to protection of IEC or EN type | The basic principle |
Flam-proof type"b" | When the equipment is in normal operation, the parts that can generate spark arc are placed in the flameproof outer shell. The flameproof shell can withstand the explosion pressure inside without loss and prevent transmission to the outer shell. |
Increased safety type "e" | It will not produce arc, spark and dangerous high temperature in normal operation. Further protective measures will be taken in the structure to improve the safety of the equipment. |
Plus presure type"p" | Keep the pressure of the internal plus gas higher than the surrounding to prevent explosive mixture from entering the shell, or allow enough protective gas to pass through the shell to reduce the concentration of the internal explosive mixture below the lower limit of explosion. |
Intrinsically safe type "I" | Under specified conditions, explosive mixtures cannot be ignited by electrical sparks and thermal effects produced by the internal circuits of the equipment under norma working or specified failure conditions. |
Oil-immersion type "o" | Soak the parts of the electrical equipment in the protective liquid so that the equipment cannot ignite the explosive gas on the liquid surface or outside the shell. |
Sand filled type"q" | An explosion-proof type of electrical equipment in which fixed conductive parts capable of igniting explosive gases are completely embedded in the filling material to prevent the external explosive gas environment from igniting. |
Encapsulated type"m" | The part that may ignite the explosive mixture is sealed in the compound so that it cannot ignite the surrounding explosive gas. |
Non-sparking type"n" | Electrical equipment shall not ignite the explosive gases around it (Under normal operating conditions and under certain abnormal operating conditions). |
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