Originally Posted By: Bob Badger
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Live work never.
Officially no live work is done without PPE (Personal Protective Equipment) and a lot of paper work.
If I was to change a breaker in a bolt on Siemens panel it would be nerve racking as the screw can fall down as it removed from the bus.
Other panels the screws are retained and would not be so likely to cause a problem.
That would be small panels.
In the real world getting a distribution panel shut down is not that easy as you will be affecting many things.
I have and use in my truck all the PPE I need to work on 480 volt at high current levels.
Even with that I would not attempt to install the "fingers" on bus bars that are necessary to mount different sized breakers on non I-Line panels.
The chance of finger A dropping across fingers B and or C is just to great to even try.
With an I-Line panel there are no fingers, the breakers, even the largest ones plug into the I-Line bus bars with no problem.
I do check for shorts between phases on the breaker being installed before trying to put in place.
I have never found any cross phase shorts but that would be the one thing that could go wrong when putting in one of these breakers.
Having to install new breakers for feeders in existing buildings is a pretty common occurrence.
Bob (AKA iwire)
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