electrical - How many wires per connector, why is a black wire

Hi all. I have a single hallway light that I decided to replace with two new fixtures. It is a 3-way with a switch in the office (3-way switch 2) and another in the hall (3-way switch 1). It appear

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electrical - How many wires per connector, why is a black wire

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Old outlet has 2 black wires and 2 white. Is it safe to connect two white and two black under one screw with the new outlet? Thank you! : r/electrical

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electrical - How many wires per connector, why is a black wire connected to a white wire, how to install brace bar without attic access? - Home Improvement Stack Exchange

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