Explosion proof electrical equipment is divided into Class I explosion-proof certificate, Class II explosion-proof certificate, and Class III explosion-proof certificate according to different usage locations.

The Class I explosion-proof certificate we refer to is a certification certificate used for underground equipment in coal mines, usually used in conjunction with the coal safety certificate of the equipment.

The Class II explosion-proof certificate refers to the certification certificate for explosion-proof equipment used in non mining explosive gas environments. For example, equipment is used in places such as petrochemical, gas, and oil depots.

The Class III explosion-proof certificate refers to the certification certificate for explosion-proof equipment used in non mining explosive dust environments. For example, equipment is used in places such as spray painting, polishing, feed, and food.

From this, it can be seen that the main difference between Class I, Class II, and Class III explosion-proof certificates is the location of use of the equipment.