Additional precautions have to be taken when using such equipment in a dust atmosphere. Flameproof equipment
would have to be purchased specifically for dust atmospheres, as the normal IP rating might not be sufficient. Cabling
can follow conventional practice for flameproof equipment but if flammable gas is not an issue, Ex e cable glands with
an Ingress Protection level of IP 65 will be suitable.
Ex e or Ex n apparatus should be purchased with the appropriate ingress protection. Intrinsically safe barriers certified
for flammable gasses can be used in dust atmospheres. When used in dust containment, barriers of the type ‘ia’ and
certified for gas group IIC should be used.
In accordance with ATEX 95, apparatus with two independent methods of protection can also be used in zone 20.
Example: t certified enclosure, IP 6X with iD circuit or pD apparatus with t certified enclosure.