Detecting first recepticle on a circuit
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You also want to make sure that you do _not_ have a ground connection
between any of the downstream outlets. It's possible that the ground
is hidden or that BX cable was used.
I thought GFI's operation had nothing to do with the ground. It trips
when it detects a current imbalance between the hot and neutral,
regardless if theres a ground or not. I could be wrong though.
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