Purged panel and Push buttons

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cornbread

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I'm having a debate with our engimneering group on what push buttons to use on a purged panel in a class 1 div 2 area. The purge I think is a Z purge (alarm only). I contend a stanadard pushbutton is OK, engineering says I have to use explosion proof. What say you?
 
don_resqcapt19

don_resqcapt19

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Location
Illinois
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retired electrician
The arc producing contacts are inside of the purged enclosure. As long as you can maintain the required purge flow and or pressure, I see no need for explosion proof pushbuttons.
 
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