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What does Ex"de" protection method really mean?

What does Ex"de" protection method really mean?

What does Ex"de" protection method really mean?

(OP)
Does anyone know what Ex"de" hazardous area equipment protection really mean?.
Ex"d" means flame-proof while Ex"e" means          increased-safety, these are based on two different principles hence I am a little confused on how the two can be combined together for the same equipment.
 

RE: What does Ex"de" protection method really mean?

In addition to above, the EX d means that for an electrical motor the casing is strong enough to hold an explosion inside, but it may mean that the motor does not work any more.

The EX e is refering to the power connection to the same motor.

Also see att. document for much more info

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