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I know this should be simple but it's nothave two cables going into a ceiling electrical box; how can I tell which is coming from the panel?

I have two cables going into a ceiling electrical boxbox; how can I tell which is coming from the panel?

I know this should be simple but it's not

I have two cables going into a ceiling electrical box how can I tell which is coming from the panel?

I have two cables going into a ceiling electrical box; how can I tell which is coming from the panel?

I have two cables going into a ceiling electrical box; how can I tell which is coming from the panel?

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I know this should be simple but it's not

I have two cables going into a ceiling electrical box how can I tell which is coming from the panel?