NEW HAZARDOUS EQUIPMENT GROUPING FOR DUST
NEW DUST EQUIPMENT GROUP III
Ref: BS EN 60079-0:2009 4.3
Electrical equipment for use in potential dust atmospheres are now classified as Group III equipment as follows:-
Dust Group | Nature |
IIIA | Combustible fibres and flyings |
IIIB | Combustible dusts (non conductive) |
IIIC | Combustible conductive dusts |
Group III dust equipment is marked as follows:
- III 1 D or III Da for Group III, Category 1, combustible dusts, assumed either A, B, or C
- IIIA Da for Group IIIA, Category 1, combustible dust (fibres and flyings)
- IIIB Db for Group IIIB, Category 2, combustible dust
- IIIC Dc for Group IIIC, Category 3, combustible conductive dust
Note: Dust groups IIIA, IIIB, and IIIC can presently be used with either Da, Db, or Dc which defines the category of 1, 2, or 3 respectively.
