Years ago I was being shown the ropes by the brother of my employer, and as he was enphisizing the import of making sure to only disconnect the neutral of which you are working on, (Of which I knew already) "follow it right to the neutral bar - DOH!!! Go inside and see if I blew anything up..." I do and find the customer sitting horrorfied in front of a smoking near Salvador Dali like computer screen.
That took some splainin' to the boss I tell you...
Sometimes it is just better to shut it all off....
