I have a large rotating (think wagonwheel) portion of a space-craft that, at the hub, connects to a non-rotating scientific research station. Imagine a football (soccer) field sized research and logistics station in microgravity, connected to a hub of a rotating space colony.
The floating scientists in the football field get to the hub, and then travel by ladder (or lift) to the spinning, near-Earth gravity colony.
My problem is connecting electricity (okay that's easy) as well as water, drainage, and sewerage from the non-rotating part to the rotating part. It needs to be one system. Has this been considered before? It's doing my head in.