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Why is it so dangerous to use a ground lift on a metal cased power tool

User Nedblorf
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Answer:

Removal of the safety ground connection on equipment can expose users to an increased danger of electric shock and may contradict wiring regulations. ... If a fault develops in any line-operated equipment, cable shields and equipment enclosures may become energized, creating an electric shock hazard.
User Iesus Sonesson
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