If the user of the screwdriver is themselves isolated from ground and capacitively coupled to other nearby live wires, a false negative may occur when they test a live circuit, and a false positive when they test a dead circuit.
3.
:Regulations would require a safety systems which ensure that in the event of a local distribution circuit going down, that one doesn t continue to pump power in to a dead circuit which could endangers the utility workers trying to fix it.
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