Basic Classification Under the ATEX Directive

The ATEX Directive classifies equipment according to its intended application, required level of protection, and the type of explosive atmosphere in which it will operate. Understanding these classifications is essential for selecting compliant equipment for hazardous areas.

Equipment Groups

Group I
Equipment designed for use in underground mining and surface installations where firedamp and combustible dust may be present.

Group II
Equipment designed for use in all other industries where explosive gas or dust atmospheres may occur, including chemical processing, oil and gas, pharmaceuticals, food production, and manufacturing.

Equipment Categories

ATEX equipment is further classified into the following categories based on the required level of protection:

• Category M1

• Category M2

• Category 1

• Category 2

• Category 3

Each category corresponds to a specific level of protection and is intended for use in hazardous areas with different levels of explosion risk.

Gas and Dust Classification

ATEX equipment is also identified according to the type of explosive atmosphere for which it is suitable:

G (Gas)For explosive atmospheres containing:

• Gases

• Vapors

• Mists

D (Dust)For explosive atmospheres containing combustible dust.

Correctly understanding these ATEX classifications helps ensure the selection of suitable explosion-protected equipment, supports regulatory compliance, and enhances workplace safety in hazardous environments.