Re: Electrical outlet/Dishwasher installation
If this is a "built-in" undercabinet dishwasher, it's not necessary to connect it using an electrical outlet. You can just "hardwire" the dishwasher, running the Romex directly into the dishwasher's junction box. However, it must be a dedicated circuit, and the breaker must have a way of "locking out" the circuit. Your hardware store or home center will have devices that attach to the breaker so you can clip a padlock on it to prevent someone from turning on the p0wer when you're working on the dishwasher.
If you do go this route, you can just run the Romex up through the floor and not have to poke into the wall. The Romex (or the p0wer cord if you do go the outlet route) must have enough slack so the dishwasher can be completely removed from the cabinet without disconnecting the wires. Four feet of slack should be sufficient. Be sure to caulk the hole where the wire pokes through, both for energy efficiency and to prevent water intrusion into the subfloor.
P.S. -- There's a possibility that the previous owner ran a wire for the dishwasher, and when the wall was sheetrocked it got tucked behind instead of being poked out. If there's a mystery circuit breaker that has a wire running from it but doesn't seem to turn anything off, that's a distinct possibility. If you have an outlet under the sink, such as for a garbage disposer, one half of the outlet may be unswitched (on all the time) and you could plug the DW into this.
Last edited by Fencepost; 12-20-2010 at 04:18 PM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.