- #36

Baluncore

Science Advisor

2023 Award

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An estimate of the voltage drop can be made by assuming equal loads, distributed equally along the cable.alan2023 said:Looking at this original question from an electrical install perspective, my challange to someone would be how to build a spreadsheet to plug in the distances and any other necessary values (voltage, wire size/resistance, amps, etc.).

The number of loads is, n = 13.

The current drawn by each load is, i = 0.35 A.

The length of the cable is, d = 580 ft.

The resistance per unit length is, r = 1.6 milliohm/ft.

The average current is, i * n / 2.

The return resistance per unit length is, 2 * r.

The twos will cancel.

V drop = n * i * d * r = 4.2224 volt.

V far end = 120.0000 - 4.2224 = 115.7776 V.