A good power cord for little money.
I build my power cable from shielded control cable 3x1,5mm², a good plug and a good cold appliance socket. Here you should take care that the material of the housing can withstand soldering temperatures, because I solder the cables in addition to the screw connection in the plugs. This results in a permanent low-resistance connection. The shielding is only connected to the protective conductor on the plug side.