New requirements have been introduced in standard 60079-15:2001-02 and EN 50021: April 1999 regarding the minimum mechanical gap between stator and rotor:
This requirement is the same as for increased safety motors EEx e/Ex e for use in zone 1.
It reinforces the safety aspect in running performance and also during the start up of the motor.
In addition to the minimum gap between the rotor and the stator, the non-sparking inside the motor is ensured by:
- Minimum value for clearances and creepage distances according to the latest standards
- Insulation material with the highest class of resistance to tracking
- Minimum IP 54 protection
- Clamping of conductors