Double Speed motor explosionproof: Our explosion-proof motors EEx-d have been designed according to European standard Cenelec EN 50014 EN 50018and for this reason they are suitable fo rhazardous areas as per CEI 64-2 - EN60079-10.14.17 standard. Explosion Groups Our motors have been certified for explosion groups II A • II B ( some II C) and reproduce the following identifica- tion marks: - GAS: ZONE 1 and 2 II 2G EEx d IIB ( some in IIC) . The standard EN 50014 and CEI 31.8 issue 459, state the type of gases and vapours included in each explosion group. - DUST: ZONE 21 and 22 II 2D IP66 T 85° C, T 100° C, T 135° C, T 200° C in accordance with standard EN 50281-1-1 Temperature classes Our motors are certified for the temperatur classes T3 - T4 - T5 ( some T6) .The Cenelec standard settles the cor-relation between temperature class and maximum motor surface temperature,