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ATEX Equipment > EX Dust Protected Equipment
Generally, electrical safety is ensured by the implementation of one of two considerations, i.e. that electrical apparatus be located where reasonably practicable outside hazardous areas and that electrical apparatus be designed, installed and maintained in accordance with measures recommended for the area in which the apparatus is located.
The Standards for dust protected equipment will be used and applied in the same way as the Standards for all equipment.
They specifies requirements in terms of
Design
Construction, and
Testing of electrical apparatus
There are currently four concepts, some are similar to the electrical protection concepts. The concepts are:
Standard - Description - Concept Letter
EN 61241-0 - Basic methods and requirements.
EN 61241-1 - Protection by enclosures - Concept - tD
EN 61241-2 - Protection bt pressurisation - Concept - pD
EN 61241-11 - Protection by Intrinsic Safety - Concept - iD
EN 61241-18 - Protection by Encapsulation - Concept - mD
Protective Measures
Protective measures shall be considered such as
EN 60526 Degree of Ingress Protection
Dust Tight Apparatus - To IP6X For use in Zones 20, 21, 22
Dust Protected Apparatus - To IP6X Electrically conducting Dust - For use in Zones 21, 22
Dust Protected Apparatus - To IP5X Non conducting Dust - For use in Zone 22
Constructional Requirements
Category 1 not more than 10% in total of aluminium,magnesium, titanium and zirconium; and not more than 7.5% of magnesium, titanium and zirconium.
Category 2 not more than 7.5% magnesium
Category 3 no requirement