Metal Recycling Entrepreneur
They do need a grounded outlet to function in their intended capacity. If you "test" them simply by unplugging it from the wall, you'll no doubt be "failing" a number of otherwise working units.
The test units should be plugged into a dedicated (and grounded) socket which can be turned off at the breaker, leaving the unit with a ground contact
Last edited by Bear; 11-26-2013 at 08:29 PM.
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