本标准规定了用于I类和II类、2类和III类、1类和2类危险（分类）场所的电气设备或其部件的设计、施工和标记的最低要求。该设备在正常运行时，不能在本标准规定的条件下点燃周围的大气，尽管该设备可能包含用于燃烧电路的电子元件，也可能具有作为燃烧电路的现场接线。 此外，本文件的目的是确定测试方法的一致性，以确定设备及相关电路和部件的适用性，因为它们与空气混合物中特定可燃气体或蒸汽、可燃粉尘、易点燃纤维或飞灰的潜在点火有关。

This standard provides minimum requirements for the design, construction, and marking of electrical equipment or parts of such equipment for use in Class I and Class II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations.This equipment, in normal operation, is not capable of causing ignition of the surrounding atmosphere under the conditions prescribed in this standard, although the equipment may contain electronic components used in an incendive circuit and may also have field wiring that is an incendive circuit.In addition, it is the intent of this document to establish uniformity in test methods for determining the suitability of the equipment and associated circuits and components as they relate to potential ignition of a specific flammable gas or vapour-in-air mixture, combustible dust, easily ignitible fibers, or flyings.