That electrical resource is already in place. A 40Amp @ 240 VAC connection is not.
So is such an oven conscious of the day of the week? Doesn't a proper kosher kitchen have duplication in numerous facilities? That, of course, would be impossible here.
On some ovens, Sabbath mode just overrides the automatic shut-off. Many oven will turn off after 12 hours, assuming that you simply forgot to turn it off after removing the food. When you put it in Sabbath mode, it stays on at the same temperature until you cancel it. Not only do you not have to light the fire, you don't have to touch the controls. I also believe that Sabbath mode prevents the light from turning on and off in some ovens - again, preventing you from lighting a fire.
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