Had a customer call,she says that when she turns on her upstairs bathroom light ,It slows down the ceiling fans down stairs and the lights go dim. I verify this is happening and notice that the bathroom looks quite New....Joe Handy man fix-it has tapped into the switched leg of a three way (He has no nuetral) So when the fans downstairs are running its in series with the light upstairs...But how did the upstairs light work without a nuetral ??? Well to top it all off the fans had no grounding conductor all of the grounding conductors had been used as nuetrals...the fan windings were enough to act as a nuetral....Rewired half that house and cutomer complained...said I overcharged them......Yet joe handy man fix it was a good guy..I can't figure people..