QuoteYour main problem will be getting enough volts to appear at the end of the wireI googled the DC resistance of Cat5 cable and got results of 95 Ohm / km ( or 50 Ohm / km )40 m is less than 5 Ohm. A 10..20 mA current sees a hardly measurable voltage drop less than 0.1V
Your main problem will be getting enough volts to appear at the end of the wire
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