Interesting. What I do know about Otis systems though is most of the modern controllers like the 411 and 401 I noted use a ring style communication loop and each car controller has an ocss board (operation control sub system). My understanding is that All OCSS boards have the abity to become the group dispatcher. So it still isn't clear to me why there exists a separate feed to the group unless one of the car controllers was set as a master for the group and the others cannot assume any dispatching responsibility. What I'm trying to understand is when another 480V power feed for the group is required to be installed.