I don't think lead is used anywhere outside of reactor stuff.
So I'm suggesting lead cables.Made the same way as the other metal cables,8EU/t throughput,and with a loss of 0.015 EU per block.
Lead is an absolute terrible conductor.
It could use silver then.If it's in vanilla IC.
Silver is used in the glass fibre cables
Although it doesn't really make sense. I think Greg/Player may be confusing them with optical fibre wires...
Really, Glass Fibre cables should be made of solid graphene, ie, carbon fibres woven atomically into a mesh.