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ekstra   ara
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PostPosted: Fri Apr 01, 2011 5:30 am 
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Joined: Thu Jan 10, 2008 8:49 pm
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Location: New England
How about adding or removing a bolt on circuit breaker from a lighting panel (208) or a power panel (480), while the panel is still energized. This would be a common occurrence in hospitals or even manufacturing where shutting down the panel creates additional risks.


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PostPosted: Sat Apr 02, 2011 4:32 am 
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Joined: Sat Mar 19, 2011 6:13 pm
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haze10 wrote:
How about adding or removing a bolt on circuit breaker from a lighting panel (208) or a power panel (480), while the panel is still energized. This would be a common occurrence in hospitals or even manufacturing where shutting down the panel creates additional risks.


That's exactly what I was doing when I had my only first hand arc flash experience 30 some years ago. I managed to touch two phase buses with the tip of my screwdriver. I was lucky. It must have been a low IE. Melted the end of the screw driver, burned my knuckles and caused temporary blindness. I also had to have cataracts removed from both eyes at a relatively young age (possibly because of the flash).

I kept that screwdriver in my tool bag during the years that I was working in the field as a "don't be an idiot again" reminder. I used to show it to apprentices as a caution warning. That was the extent of arc flash hazard training back in those days.


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