Single conductor-

identical to the braided wire style but instead uses cheaper pvc wire with a single wire acting as a hot & a bare as a ground

Internally-

the Screw coil’s start wire (red) is connected to the white pvc wire. The screw and slug coil's finish wires (Black) are soldered together. With the slug coils start wire (red) and bare wire soldered to the baseplate. This style does all the hard work for you. With this set up the ground is pre-done and all you have to do is solder it to a pot casing.