I don't know if you are the one I replied to or not. However, my warning was not to you but to anyone trying to imitate you. I have watched utilities workers handle 7200 volts live but that doesn't mean I would do it. They are trained and equiped for the job.
We had a club member who shocked his wife everytime she helped him cut foam. After talking to him I found out that he was using line voltage directly. Duh!!!!!! He didn't know any better, he was a mechanical engineer!
Any time you have live line voltage connected as you say, there is a chance of a fault causing a problem, no matter how well you have made the connections. Wires do break.
Your suggestion of an isolation transformer is appropriate and a safer solution.
Dan Thompson (AMA 32873, EAA 60974, WB4GUK, GROL) remove POST in address for email