Formula & method
Two-wire resistive estimate: Rloop = 2 × length × resistance/length; Vdrop = I × Rloop
Worked example
10 A, 10 m one-way, 1 Ω/km → 0.2 V drop
Assumptions & safety boundary
Mathematical estimate only. Verify equipment datasheets, manufacturer instructions, electrical codes and qualified design before real-world use. Do not work on energized electrical systems unless you are qualified and authorized to do so.