Back in the days when I worked on live chassis equipment I always used an iso tranny as we didn't have earth leakage breakers then (70's). I saw a colleague being electrocuted and unable to let go. Fortunately he eventually threw himself backwards and ripped the mains plug out as he went. He was o/k but very shaken. Could have been much worse. I don't take any chances. Especially when you are working on your own.
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