Here is an example of a supervised circuit with an end of line resistor.
If the resistor isn't seen due to a line break the panel will go into trouble.
In the pictuer you will see this wiring three different ways.
One is normal at the top.
The other two are good and bad but the resistor is all the way back at the panel.
The reason for this is we may have to split up the circuit later into two circuits.
The bad one will work but as you can see it would be a nightmare splitting or trouble shooting any bad connection or break in the wiring.
The single line represents a pair of wires/two conductors, not one wire/conductor.
Worth
Device wire. R.jpg