Abstract: A power supply cable (20; 40; 50; 70) comprising a plurality of conductor assemblies (10; 30; 60), each conductor assembly comprising an electrical conductor (14; 63) and a cooling tube (11) defining a central internal passage for carrying a cooling fluid, wherein the cooling tube (11) comprises an inner polymeric layer (12) in contact with the internal passage (17) and an outer polymeric layer (13) surrounding the inner polymeric layer (12), and the inner polymeric layer (12) has a first Shore D hardness value and the outer polymeric layer has a second Shore D hardness value, the first Shore D hardness value being larger than the second Shore D hardness value. The present disclosure further relates to a power charging cable assembly and a charging system including said power supply cable.