Janello Posted October 19, 2014 Report Share Posted October 19, 2014 Before I pour the concrete slab in my new shop I'd like to run conduit to a few electrical boxes in the floor. Ideally, I'd like to have two locations that share 220v and 110v outlets. Does anyone know if there are boxes made for this purpose that I can install both 110 and 220 in one box? Quote Link to comment Share on other sites More sharing options...
Tpt life Posted October 19, 2014 Report Share Posted October 19, 2014 I do not know this by code. What I do know is that pipe and boxes are the cheaper part of most electrical systems. Quote Link to comment Share on other sites More sharing options...
Trip Posted October 19, 2014 Report Share Posted October 19, 2014 There’s NEC, then there’s what the town requires, then there’s what the local inspector wants to see – these could be the same, or not… YMMV. Further, Hurricane Sandy drove some municipalities to tighten codes for near-grade-level electrics. I believe there was also an NEC update in the last 24months, so my 2010 copy is out of date. With all those caveats understood: If you use a double-gang box fed by separate branches (a 220 and a 110 - no paring a 110 from 220 branch, sharing Commons, etc -- none of the nonsense) with each gang having its own receptacles (220 on one side and 110 on the other), you can do this – by Code… However, as stated above, many towns have tightened residential electric/utilities post-Sandy. It may be Code, but you may not be able to get it approved... Call your town Engineering/Code Enforcement Dept and ask. Be prepared to provide elevation above grade for the slab/box/etc… It rather goes without saying, that if this is a below-grade install, it ain’t going to happen… Good luck. Quote Link to comment Share on other sites More sharing options...
Tom King Posted October 20, 2014 Report Share Posted October 20, 2014 there are floor boxes, and floor receptacles it's probably easier to find what's available online than in your local electrical supply. The supply house will probably only have one or two choices. For a recent project where I needed a couple, I just ordered them online to start with. Quote Link to comment Share on other sites More sharing options...
Janello Posted October 23, 2014 Author Report Share Posted October 23, 2014 Thanks for the info guys. Quote Link to comment Share on other sites More sharing options...
Beerboss Posted October 23, 2014 Report Share Posted October 23, 2014 Yes, you can have 120v & 240v in the same box. Voltage limitation is 300, you can’t have over 300 volts between any 2 phases. Floor boxes come in a variety of types the more versatile the box the more expensive they get (as you would expect). The cheapest being the round Carlon box will allow only one type of device per box. While you can have both 120 & 240 you would have to choose between the two since they do not make a combination device. You can have the wiring in the box and change the configuration latter if you want. Quote Link to comment Share on other sites More sharing options...
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