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The neutral should be the same size as the hots. The neutral could possibly carry as little as zero amps (even if the hots are carrying full amps) to as much as the full rated current of one hot (if one hot was pulling max amps and the other hot pulling zero amps). That is a characteristic of split phase 120/240 vac power.
The ground can be smaller but I don’t remember the rule for sizing it.
6 ga is small for that distance. You could have a drop of over 5 volts at 25 amps or over 10 volts at 50 amps according to one voltage drop calculator I looked at.
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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