Start with the formal area classification
Zone, equipment category, gas or dust group and temperature class must come from the responsible site or hazard-analysis team.
Provide representative material data
Combustible-dust properties can change with particle size, moisture and formulation. Relevant data may include Kst, Pmax, minimum ignition energy and minimum ignition temperature.
Evaluate mechanical ignition sources
ATEX design is not limited to the motor. Bearings, seals, clearances, foreign-object risk, surface temperature, static and abnormal operation must be considered.
Coordinate the full system
Feeders, filters, transfer lines, discharge equipment and controls can affect the same hazardous zone and protection strategy.