I am putting in a 50A sub panel to run 40A cookstove,30A water heater,30A oven,30A dryer,7 20A circuits. Will this work on 6-3 with grd NM cable

If all of the amp ratings you are quoting are for 220 with exception to the 7 - 20a circuits. Your going to have system overload with so much going on.

What voltages are these units your quoting?

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Originally Posted by pawhit109

I am putting in a 50A sub panel to run 40A cookstove,30A water heater,30A oven,30A dryer,7 20A circuits. Will this work on 6-3 with grd NM cable

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Do not expect to be able to use the cooktop and oven at the same time as doing dishes with hot water. Let alone drying clothes.

That is quite a LOT for only a 50A panel. WHY so much on that panel and why only 50A?

Try running this plan by your local electrical inspector.