Did Rabbi Moshe Feinstein hold that the ban on electricity use on Shabbos (where no other issur results) is a biblical prohibition, a rabbinic prohibition, or just a minhag?
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He writes explicitly that he's not sure whether extinguishing an electric appliance is forbidden mid'oraysa, and uses that doubt as grounds, when combined with certain other grounds, to permit doing so. (Orach Chayim 3 #42.)