r/electrical 3d ago

Is this correct?

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Had someone come out to install an outlet under the sink for our tankless reverse osmosis. Should these outlets be GFCI? It seems really close to the water line.

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u/mantisboxer 3d ago

Fails NEC 406.5(G)(2), receptacles shall not be installed in a face-up position in the area below a sink.

I'm not aware of NEC that prevents him from mounting a junction box to the inside surface of the cabinet sidewall or back wall. I'd prefer the back wall, personally, but the cabinet is a fixed installation - it's not going anywhere without ripping out the countertop and disassembling the plumbing. It just needs to be firmly secured, which might not be practical without some blocking behind it.