For solenoids in class II, Div 2, they are required to be compliant with 502.120(B), which only requires them to be in an enclosure that is dusttight or otherwise identified for the location. That said, is a coil with a Nema 4/4X rating acceptable?
I read the code section you referenced. Confusing as always.
It says dusttight or otherwise identified for the location.
Here some thoughts that might induce some thought.
Nema 4/4X is dust tight, but not rated for Class II, division 2 per my perception.
Class II, division 2 generally requires Nema 9 enclosures. Also keeps heat inside.
A nema 9 will contain an interior explosion, a Nema 4/4X will not. Nema4/4X not rated for group E, F and G.
The link below gives a wonderful explanation of the difference between Nema 4/4X and Nema 9.
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In the end, if there is a spark, will there be an explosion inside the enclosure (good) or an explosion outside the enclosure (bad)? Is your enclosure heat rated?
Doesn't Class II, Division 2 also require rigid conduit with at least 5 threads and seals?
Please correct me if someone knows better.