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  • Per OP's description, the fan+light has two hot wires, one for the motor and one for the lamp, but only one shared neutral wire for both loads, that he cannot separate. In his drawing, the switched-hot goes to the lamp hot wire via one cable, and the constant-hot direct from the basement lights goes to the motor hot wire via another cable. - But the combined return current cannot be safely returned by any permutation of the two neutral wires. Commented Jun 14, 2020 at 18:58
  • @A.I.Breveleri Oh, I couldn't believe the basement lights were unswitched, but OK, that makes sense. Commented Jun 14, 2020 at 19:28
  • 2
    Repeating the no loops call. Every loop you create is an antenna. You should realy be runnig single 3 core cables for every circuit and never individual cores. And don't tap neutrals because it's convenient do it once do it right. Simon Registered Electrician and Rf designer Commented Jun 15, 2020 at 4:00