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The current can flow through unintended paths.
Regardless of appearances... The ground circuit must be checked to confirm that it is in fact grounded CORRECTLY.
That means locating it, taking it off, loose, inspecting (your choice of methods). Many inexplicable phantoms are caused by poor grounding.
Horror stories of money flushed down the toilet due to faulty grounding.
When an electrical appliance or system is not properly grounded, the current can flow through unintended paths.
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