CZ1490 explosion-proof junction box (IIB+H, IIIC/Db), with EU ATEX explosion-proof certification, EAC Customs Union explosion-proof certification and China CCC certification, meets the latest international explosion-proof standards, and can achieve dual explosion-proof. CZ1490 explosion-proof junction box (IIB+H, IIIC/Db), with EU ATEX explosion-proof certification, EAC Customs Union explosion-proof certification and China CCC certification, meets the latest international explosion-proof standards, and can achieve dual explosion-proof. The equipment Group I is subdivided into the Categories M1 and M2: The equipment in this category is intended for use in both underground parts of mines and those parts of surface installations of such mines that are endangered by firedamp and/or combustible dust. The equipment shall continue to. means: Not possible to use. Notified Body (NB) that has tested and certified the product (Cat. The CE marking confirms compliance with all applicable EU directives, while the Ex marking specifically shows that the product is suitable for use in potentially explosive atmospheres under the. ATEX protection methods provide systematic approaches to eliminate explosion risks by addressing the fundamental principles of combustion prevention. Understanding these protection concepts is essential for selecting appropriate equipment and ensuring compliance with safety standards in industrial. rence of an explosive atmosphere. Ignition temperature of a specific dust hazard must be higher than maximum surface temperature isplayed on electrical equipment. Category 1. These explosion-proof enclosures are the spearhead in terms of safety and provide optimum protection for your installed components against the ingress of gas, dust or water.