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Infrared Windows and Arc Ratings: Dispelling the Myth of “Arc-Resistant IR Windows”

Posted by Martin Robinson on 4/7/15 10:00 AM

There exists a dangerous misconception regarding the “Arc Rating” of infrared (IR) windows or viewing panes. Many reliability and maintenance professionals are under the impression that an IR window will protect them in the event of an arc blast; still others are under the impression that installing IR windows will turn non-arc-rated switchgear or electrical equipment into “arc-rated” cabinets. Neither is the case, and both misconceptions need to be corrected because they present very real safety concerns.

 
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Topics: Arc Flash, Education, Infrared Windows, Arc Flash Safety, Standards & Regulations, certifications, switchgear

Why do companies still insist on installing products that de-rate their switchgear?

Posted by Martin Robinson on 4/1/15 4:11 PM

I am amazed when I still see companies fitting crystal infrared (IR) inspection windows into their 1kV and above electrical switchgear,  IEEE C37 20.2.a.3.6 clearly mandates that all visual viewing windows irrespective of size, shape or material undergo an impact and load test, and as we know all fluoride based IR windows cannot pass any form of impact test!

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Topics: Arc Flash, Infrared Windows, Current News, de-rating, switchgear

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