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Discussion Starter #1 (Edited)
My father recently purchased a new dishwasher and ran into a problem during installation. Electrical service to the dishwasher comes through the floor in the center of the dishwasher cabinet opening. The old dishwasher had an electrical box integrated into the bottom of the dishwasher, and the electrical cable reached this box. The new dishwasher is a Bosch, which has its own electrical box that needs to be mounted in a cabinet next to the dishwasher (usually the under-sink cabinet). The existing electrical cable does not have enough slack to reach the next cabinet.

The kitchen in this house is on the ground floor. The portion of the kitchen containing the dishwasher and under-sink cabinet is cantilevered about 3 feet past the foundation edge. This means that if you travel down through the floor under the dishwasher or sink, you would be outside (under a deck, an accessible but not pleasant-to-access area). Electrical wiring (and formerly plumbing, now relocated) are contained in a plywood enclosure underneath the deck.The interior of the enclosure can be accessed through the basement ceiling below.

Some questions regarding this uncommon situation:

1. Wiring to reach the under-sink cabinet needs to be extended or a new longer cable needs to be run from somewhere accessible to the under-sink cabinet. Existing wiring is NM. The NM is run inside the plywood enclosure. This is fine if the enclosure is considered the interior of the house. I believe this is not OK if the enclosure would be considered the exterior of the house. Is there anything in the NEC that addresses and clarifies whether such an enclosure is interior or exterior?

2. Since the plywood enclosure can be accessed from the basement ceiling below, is putting a junction box inside this enclosure with access from below permissible? There is a hole in the drywall basement ceiling serving as the access to the enclosure from the interior. Normally this hole is covered with a small HVAC register (not connected to ductwork). Whether or not this is permissible, I'm not sure this hole is large enough to work with to secure a new junction box, connect the wiring inside, and then close the box. If the plywood enclosure is partially disassembled, a junction box is installed in the enclosure, and then the enclosure is reassembled, is the junction box considered accessible then?

3. If the plywood enclosure is not considered accessible from below but we need to put a junction box in the enclosure, is there an acceptable method of creating an access panel in the plywood enclosure that would be accessed from under the deck (similar to an access panel that can be installed in drywall)?

4. If my dad takes apart the plywood enclosure and it turns out a workable course of action is to install a junction box outside of the plywood enclosure (e.g. attached to a floor joist supporting the deck), now we are definitely outside. Can NM be run outside in this situation? If so, what sort of box would he need? If NM is not permissible in this situation, I know it's possible to switch to some other cable for exterior use (or maybe use wires in conduit), but either solution would need a junction between the interior and exterior, so that doesn't help this situation.

FYI, this kitchen was gut-renovated in the early 2000s, with permits, and the township building inspector presumably new NM was in the plywood enclosure and passed the work.
 

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If the cable will reach into the sink base, install the needed box there and be done.
 

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cut a hole in the plywood under the dishwasher and put a junction box in there and extend the electric to the cabinet next to the dishwasher and connect the electric to the bosh box or 2nd junction box then screw the plywood back on the floor, the box in the floor is accessible if needed...
 

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A "Handy Husband"
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Install the junction box behind or under the DW. From the JB run a cable to the sink base.
 

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then figure out what wire in the basement goes to the dishwasher and cut and put a junction box there and snake the wire where it has to go, your gona have to take apart or open something to get it done..
 

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A "Handy Husband"
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Floor under dishwasher is tiled.
Surface mount the box to the tile floor if the cable will not reach the back wall. All the DW I have seen have space under them that will accommodate a JB.
 
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You could mount the box on the back wall.
Like RJ said, plenty of room behind the dish washer.
 

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Discussion Starter #10
You could mount the box on the back wall.
Like RJ said, plenty of room behind the dish washer.
I don't think the existing cable can reach there, either.

Let's stop for a moment throwing out suggestions of how else to do this. I can figure those out on my own; if a box fits somewhere and it's accessible then that's doable and I understand that.

My question is about some particular box locations that I think may be feasible based on the situation. I haven't gotten any answers on those questions.
 

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if you want to do it 100% legal, the junction box must be accessible( not sealed in a wall or floor permanent) so an access door or unscrewing a panel is fine...so any where you can squeeze a box would be good, now if you dont have to keep it 100% code but done safely, there are plenty of options..its your call what you want to open up to stick a box in...you could get a diamond blade, cut the tile and flush mount a junction box with the floor and put a solid cover on it..you can even go 1 step better and use an exterior box just incase the dishwasher ever leaks that box would be water tight...
 
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