I've been told that if an explosion proof housing is used, an entire switch can be considered explosion proof, i.e. the same explosion proof certifications can be offered on an instrument that the housing carries. This seems suspect since I know that it is required that companies send complete units to labs such as Baseefa to be tested before you can receive a certification. I've asked the question over and over and I am continually told that it is acceptable to sell an assembly as explosion proof when only the housing has been certified; more specifically, I'm told "it's an industry standard practice to use the certification of the housing to deem an assembly explosion proof".
Can someone please shed some light on this
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