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It can be done,,, but,, ther should be a through understanding of electrical and grounding systems. Ins companies put the kibosh to it as far as liabilities go after a few incidents. I am sure the incident with the cows came from a shorted electric system which occured after it melted some system wiring. We do it all the time,, but,, I dont send an amateur on pipe thaws. On rolled copper water systems its fairly safe especially at realatively low currents. I usually carry an ampprobe with me to make sure the machine is acting properly.
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