Is it illegal for a neighbor of an extension cord to power a device needed for a home run without power?

Some advanced new power unit on-line: question donpalmir : Is it illegal for a neighbor of an extension cord to power a device necessary for a property run with out electricity I live in Arizona and my brother has a device to be connected, but our efficiency is about to be released for several days. Our neighbor has provided to run an extension cord temporarily the power of the device, but I want to know if it's illegal or not. Can any person support answer me Finest: response from Teekno

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