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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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Maybe you mean Reb Zalman Oyerbach? he held that the issur is derabanan (minchas shlomo a, 9-12), so did the Tzitz Eliezer – eliavs Feb 13 '14 at 11:18
As summarized here Rav Moshe did not come to a conclusion on the matter, and remained in doubt about it. I don't know the source enough to know if it is reliable, and I don't have time to check the quotes, but he gives his sources to investigate. – Yishai Feb 13 '14 at 23:18
Rav Shlomo Zalmen held it was a minhag – sam Feb 14 '14 at 16:09
@sam From wht I understand Reb Shlomo Zalmen did not hold it is a minhag but derabanan (issur "nolad" or "ovadin dechol") – eliavs Feb 16 '14 at 10:10
Electricity can be used in various forms. For example a fan would have a different din than a light bulb. And a cell phone from a car. Every device and how they operate will determine what the din is – David Feigen Mar 2 '14 at 23:15

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.)

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Which implies it is at least mid'rabbanan. +1 – Y ez Mar 6 '14 at 19:25

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