I had a boy from the neighborhood doing some landscaping here. He was digging in the mulch beds and uncovered a large metal pipe that I assume carries the AC to my detached garage. He didn't damage the pipe but for some reason he took it upon himself to spray paint it. So my question is, does spray paint make a pipe deteriorate faster? Is it any less electrically grounded with a coat of paint on it?

House is concrete slab in South Florida. After I opened up the kitchen wall to redo some of the wiring I noticed the previous owner did multiple wire splices inside the wall during his last kitchen remodel, these splices are not in any accessible junction boxes. I have since corrected all of those, either by replacing with a longer run or by adding junction boxes where needed. However I have one spot I am unsure about. There is a run of wire (12-2 NM-B) that runs down into the concrete slab, via a blue ENT conduit, this conduit runs below and comes back up about 10 feet or so away, under the kitchen island to supply the power to the dishwasher and garbage disposer. I am going to get rid of the garbage disposer, so it will be just for the dishwasher in the future. First, is it OK to run this blue ENT conduit under the slab? I don't know if it's inside the slab all the way, or whether it went past the slab into the subsoil below. Second, is it OK to use this ENT conduit as a raceway for NM-B wires for an underground application like this? I would have preferred to use PVC but I don't want to break up the floor and walls and the island cabinets, so I am hoping this is OK. Third, the NM-B wires is a bit short, it does reach the new junction box I put in but I have to sort of pull it pretty tight, tighter than I wanted. I can't move this junction box because if I move it closer, I am further away from another line that comes from the above. One thought I have is to pull this NM-B wire out, and replace it with a longer run of wire. I disconnected one end and pulled on the other, and it's very tight. I didn't try too hard as I don't want to end up with a wire stuck half way. So I wanted to know is if I pull out this 12-2 NM-B wire, how much difficulty will there be to run another run of 12-2 NM-B wire through this same ENT conduit? I don't know if the ENT conduit was run straight or twisted and coiled. Thanks in advance for any comment. :coffee: