Good Evening Don,

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The original question dealt with voltage drop on a 24 volt line. (See original question below.)

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The voltage drop for a length of wire is dependent on its length, the current through it, the size of the wire, and the wire’s material.? All other things being equal, the length of wire that will give you a 3% voltage drop for a given current through it will be about 22% for a supply voltage of 24 volts instead of 110 volts? ((24 / 110) x 100).? Therefore, using the numbers you supplied (and assuming they were for the supply plus the return lengths of wire), one would be limited to 7.5 feet of 18 gauge wire or 12.1 feet of 16 gauge wire. ?

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I don’t know what on-line table or calculator you used, but one also needs to be careful when doing these types of calculations to recognize if the cable is in free air or in a conduit.? Wires in a conduit will have a more restrictive rating than those in free air because any heat generated in the wire will be trapped with the conduit.? ??

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Jerry F.

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ORIGINAL QUESTION: “Hello all. Back again with another simple question. What american (sic) wire gauge sized wire size should I use to connect the 110-120v to th 24v out converter box, thence to the speed controller and finally to the motor itself. The scooter motor wire looks to be 16 awg or so. My rudimentary knowledge of electrics tell me that watts/voltage= amperage or 150W/24V= 6A in round numbers. From tables on line it appears that 18awg should be more than adequate. Is that reasonable?”

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