What do the explosion-proof Ex label and coal safety MA label mean respectively?

Many customers do not understand what the Ex and MA logos represent. As a professional explosion-proof testing and certification organization, Zhongnuo Testing will briefly explain it to everyone.

Ex identification,It is an abbreviation for Explosionp roof in English, which means explosion-proof. Marking the product with Ex indicates that the product meets the requirements of explosion-proof standards and belongs to explosion-proof products.The letters following the explosion-proof symbol Ex indicate the explosion-proof protection method, equipment category in the place of use, temperature group, and equipment protection group. According to the requirements of GB 3836 standard, the explosion-proof marking of explosion-proof electrical equipment includes:Explosion proof protection methods are used in places where equipment categories, temperature groups, and equipment protection groups are used.

For example:Explosion proof markEx d IIC T4 Gb，

Among them:

Ex represents explosion-proof products, indicating that the product is explosion-proof;

D indicates that the explosion-proof type is explosion-proof and suitable for zones 1 and 2;

IIC indicates that it is allowed to be used for Class IIC explosive gases (representative gas is hydrogen);

T4 indicates that the surface temperature of the equipment does not exceed 135 ℃;

Gb indicates that the protection level of the device is "high"

MA， Mei An is an acronym for Coal Safety. So the MA label is the coal safety label. In China, equipment and products used in coal mines must obtain the coal safety mark in accordance with the relevant requirements of the National Safety Standards Center, which is a mandatory national mark certification.