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Choice of safety-electric motor

The connection between danger zones and the categories of equipment to be used is defined in Directive 1999/92/EC. The specific construction standards for the protection modes (e.g. Ex d) also define the motor category that can be obtained by applying the standards (e.g. 2G).

CHOOSING THE PROTECTION MODE FOR ZONES IN WHICH GAS IS PRESENT
Explosive
Atmosphere
Danger
Zone
Protection guaranteed
by Equipment
Motor
Category
Protection
Always present 0 Very High 1GIEC EN 60079-26
Probable1High2GEx d
Ex de
Ex e
Improbable2 Normal 3GEx nA


CHOICE OF PROTECTION MODE FOR AREAS WHERE COMBUSTIBLE DUST IS PRESENT
Explosive
Atmosphere
Danger
Zone
Protection guaranteed
by Equipment
Motor
Category
Protection
Always present 20 Very High 1DCurrently
not provided for
Probable21High2DEx tD - A21 -IP6x
Improbable22
Conductive dusts
Normal 2DEx tD - A21 - IP6x
Improbable22
Non-conductive dusts
Normal3DEx tD - A22 - IP5x

N.B. Equipment of a higher category can be installed in place of equipment of a lower category.