Alumium wiring
Aluminium wiring has been used in cabins for years to save weight. Back when I was an avo I dealt with it regularly in AB cabins. Just wack up the voltage and it works fine. Only area you MUST use copper is around the engines and APU due to temperatures (melting point of copper being higher). I havn't worked in an MRO for years so I'm sure somebody else who has can elaborate.....