You don't mention the length of the run. If it's a short run, say 20 feet, then the difference in voltage drop (in the case of an unbunbalancedalanced load) between 2 and 4 guage will be negligible. But if it's a long run, say 100 feet or more, it's probably worthwhile to go with 2 gauge just to reduce potential voltage drop.
As far as ampacity goes, you can easily figure out your worst-case scenario by looking at your circuit breaker panel. Add up the sizes of your circuit breakers on each leg. If, for example, you have four 15 amp breakers on one leg and five 20 amp breakers on the other, that means you'll never have more than 60 amps load on one leg and no more than 100 on the other. 4 gauge URD has an ampacity of 85 amps (in conduit), so the 100 amp leg could potentially cause an overcurrent in a 4 gauge neutral. But by moving one 20 amp breaker to the other leg, you would bring both legs down to 80 amps, which a 4 gauge neutral can safely handle.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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