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We have ranges and dryers all over the country wired this way, and while not ideal, this is a similar situation.
InPhase277
I hear what you are saying. Ranges and dryers are not supplying multiple loads through a load center. Not even close to being similar. You can help him do a hack job if you want, I just wanted to say what I said. And a simple call to the AHJ (local fire departments are good too) if there is one, will get the receptacle outlet brought into compliance in a commercial location pretty quickly in most areas. I won't be debating this with you. I said what I wanted to say. You guys go ahead and do whatever you want. :no:
 

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The box you made looks pretty good, I just wanted to see how it was all connected internally, no worries if you can't get a pic.
 

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You need to make a 4 wire panel, and it won't be cheep. I would wire it the same as an R.V. Up to a 50 amp main breaker( if you use a range cord)( 30 amps for a dryer cord), isolate the neutral from the ground in the pannel. Use all G.F.I. breakers. You will need to 3 wire all of the receptacle boxes and, use a grounding pigtail on each box. Connect each ground wire to the pigtail with a ground crimp ring, and then run it to the receptacle ground screw. I would use MC wire to the boxes. Most home centers sell it in 25 ft boxes now a days. For the old box I would put in all new GFI breakers. You can get GFI protected extension cords, or plug in GFI adaptors for the old box, but again they ain't cheep. Check out some of the GFI products at Technology Research Corporation, Clear Water Florida. Why wouldn't that qualify as a temporary under article 590.4(C). Even with a 4 wire if he had to hook up the ground, and neutral to one ground bar it will give 4 wire protection. His 50 amp breaker is an approved panelboard.( Maybe)
 

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I just stumbled onto this site, and have this same situation.


My thinking on my panel is
wire it with separate ground and neutral (4 wire) and put a 4 wire receptacle on the outside of the box.
Then I can make a 4 wire cable to run for a normal 4 wire house setup.
AND
make a cable that has the 4 wire on one end (to plug into my box) and a 3 wire plug on the other with the ground and neutral tied together on the 3 wire end.

Would this be the "least wrong" and safest method?

It will give the added expense of an additional cable, but the 3 wire to 4 wire adapter cable can be short.
I will of course make the box with gfci receptacles
 
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