Class 1 Div 2 question

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Our contractor has installed NEMA 4X junction boxes that will be used for pull boxes in a Class 1, Div 2 area. Per 500.7(A), I interpret an explosion-proof apparatus has to be used. The contractor disagrees saying 4X with Myers hubs will suffice.

Any thoughts?
 
Our contractor has installed NEMA 4X junction boxes that will be used for pull boxes in a Class 1, Div 2 area. Per 500.7(A), I interpret an explosion-proof apparatus has to be used. The contractor disagrees saying 4X with Myers hubs will suffice.

Any thoughts?
How do you interpret 501.10(B)(4)?
 
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