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Unless you have a heart condition failure of the isolation on your repair bench should only result in a strange tingling, mild pain that subsides in a few seconds of letting go of equipment, and the release of some foul language... assuming safe bench practice. Test equipment.damage.is possible too.
Safe bench practice is only touching one potentially conductive object at a time (some recommend keeping one hand in your back pocket). Remember on a hot chassis TV or radio that uses a double you can have around 320VDC at lethal current levels....An isolation transformer will NOT save or even help you if one hand is touching B+ and the other is touching B-....no amount of equipment can cover for bad bench practice.
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