How to determine whether it is an explosive gas environment?
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I would like to ask everyone: is the test area using No. 32 lubricant located in an environment with explosive gases? Is it necessary to choose explosion-proof versions for electrical equipment (pump motors, instruments, etc.)?
There are national standards for this; the original poster should refer to the contents of GB 3836 and GB 12476, as they contain detailed regulations and requirements.
For explosion-proof selection, the key factor is whether there are flammable or explosive substances in the working environment; it is also necessary to consider whether the installation will take place outdoors, with IP55 being the preferred rating in such cases
GB 50058-2014 Code for Design of Electrical Installations in Explosive Atmospheres