You need a thicker (smaller gauge number) the longer your wire run is. This is Due to Ohms law It simply states that if you multiply volts times amps you get watts. voltage in a long run extention cord is slighty lower at the end so ampage thur the wire goes up this cause the wire to heat.As a wire heats its restistance increases causeing voltage to lower more and increaseing current a larger wire can carry more amps.
so a 12 gauge is better then a 14 gauge . the outercase also makes a differance your typical pvc orange covered cord tened to be a pain to use when it gets cold out where black rubber coated ones seem a little more plyable as the thermometer drops.
The bad thing is wire becomes more expensive as it gets thicker and rubber is more expensive then pvc so dont be to shocked at the price of a high quality rv cord.
I am so glad i dont have ac mircowave toasteroven or and other
electrical hog so i can get away with useing a cheap orange cable.
Al
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