Why does a End-Of-Line Voltage Drop Calc yield a different result than a Point-To-Point Calculation?
The end of line resistor calculation shown at the start is a worst case approximation, assuming that all of the current is flowing through a single device \$30.\overline 3\overline0\$ rods away rather than several devices at varying distances.  The second calculation is more accurate and quantifies the whole network but more time consuming.







simulate this circuit &ndash; Schematic created using CircuitLab

This shows the oversimplification being made.  The top diagram is the actual circuit, the bottom diagram is what the end of line calculation represents.

Those are awful, weird overlapping diagrams you have there by the way.