Explosion-proof equipment is enclosed in a case that is capable of with-standing 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.

Format: Most exams are open-book and consist of 80 to 100 multiple-choice questions.
Time Limit: You generally have between 3 to 5.5 hours depending on the specific license type.
Core Topics: Questions typically cover wiring methods, grounding and bonding, load calculations, and overcurrent protection.