Description of protection standards for dust explosion-proof motors

The difference between type A and type B of dust explosion-proof motor housing:
Two different types of enclosure protection type "tD" are specified: type A and type B, both types have the same level of protection, the main differences are as follows:
Dust explosion-proof motor enclosure protection type A:
1. Mainly written according to performance
2. The maximum surface temperature is measured at the relevant dust thickness of 5mm, and the installation regulations require a safety margin of 75K between the dust surface temperature and the ignition temperature
3. The method for determining the entry of dust is based on the IP code in GB4208
Dust explosion-proof motor housing protection type B:
1. Mainly written according to normative requirements
2. The maximum surface temperature is measured at the relevant dust thickness of 12.5mm, and the installation regulations require a safety margin of 25K between the dust surface temperature and the ignition temperature
3. The method of measuring dust entry is according to the thermal cycle test
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