I have a 11' long bathromm countertop with 3 individual drop-in sinks. I have a GFI on each end of the counter top to service the 2 outer sinks, do I need to add an additional GFI in the center to service the middle sink? The middle sink is over 3' from the edge of the sink to the 2 outer GFI's. This set up is in a commercial building.
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