Terminating to a spare breaker while energized?

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zog

Senior Member
Location
Charlotte, NC
My understanding is that arc flash studies are no longer available from Bussmann.

We stopped as well, too many yahoos submiting bids for 1/3 our price because they have no idea what they are doing and are using free on line arc flash calculators (No PE obviously), but sometimes the work is not important, just the low price, so I did the same thing I did 10 years ago when untrained people started getting into UR scanning, I let them have it and moved on to something else. :)
 

jimnan88

Member
Location
California
I would say no you cannot do this legally. The bus of the breaker panel may be covered and the breaker you are working on could be locked and tagged off, but the breakers adjacent to it are still on. Even though they probably have finger safe wire terminals there is still a substancial portion of the lugs protruding enough where you could come in contact with them.
I have only seen a few large distribution panelboards that have a true isolated can around the load side of the breaker with an individual door so as you could truly work on a connected breaker, most small ones have a simple front cover that covers the load sides of all the breakers, thus if you remove it you have exposed the live circuits.
 
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