It seems like this is an ideal case for modular wiring, ie the wire is cut to size, and terminated with modular connectors at the factory. Installation is just

It seems like this is an ideal case for modular wiring, ie the wire is cut to size, and terminated with modular connectors at the factory. Installation is just threading the wire through the building and pluging it in. Connectors could be copper, the wire itself could be aluminium, completely sealed in pvc.