"Think about it, spark producing devices are only allowed to exist in an un classified area..." OR in an
explosionproof enclosure [Section 501.15(A)(1)(1)] OR by using some other recognized protection technique.[Section 500.7]
You should also carefully review the definition of
explosionproof equipment in Section 500.2 so you will have a correct understanding how it works.
Explosionproof Equipment. Equipment enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby.
Explosions can, and do, occur in
explosionproof equipment - commonly in Class I, Division 1; not so often in Class I, Division 2 (but it can still happen).
BTW,
unclassified is also a defined in Section 500.2 and there is no space between "un" and "classified".