Why is Acetylene part of Group IIC of IEC (Group A of NEC)

Hazardous Area Classification
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Ever wonder why Acetylene is classified under Group IIC of the IEC’s explosive material classification system (equivalent to Group A of the NEC material classification)? Why is it classified as much more explosive as compared to say, Methane?

Rather than launch into the theory of explosivity and other such things, wouldn’t it be nice to watch how a 0.5 gms qty of Acetylene behaves when ignited? Watch the video below.

More information on the reasons of area classification can be understood by downloading the ebook on hazardous area classification here.