16 AWG min, short run, 10 amperes; 14 AWG min short run 15 amperes; 12 AWG min short run 20 amperes. I wouldn't run more than that out of one of these receptacles. In short, look at the size of the wire of that which you plug into it. If you have a short run you really don't have to have any larger wire size than the load....but I like some cushion.
Keep in mind that a cigarette lighter is used seldom and the average work load is very very low. The average work load is what heats wiring up, not short spurts of 2x, 3x normal rating. If in doubt, grasp the wire with your hand and if it feels warm after it has been supplying power for 15 minutes roughly, your wire is too small.
I am not competing with John, just trying to give you a different perspective. I made my living as a EE too.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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