In an electrical enclosure with both 120 V control circuits and 480 V power circuits can a Lexan cover over the 480 V components negate the need for arc flash PPE when servicing the 120 V components? The circuits are live.
I will offer my opinion here. The quick answer is "no". Although some equipment manufacturers and some engineered solutions do have certain types of nonconductive covers over electrical components these are designed to protect against accidental contact and are a measure of shock protection. I would venture to say that developing and installing any form of arc flash protection has not been tested and approved by an appropriate testing agency would be a huge liability risk. There are simply too many factors involved in the circumstances surrounding an arc flash event for an individual to say otherwise...my dime.
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