![]() If you're running the same current through the first length of wire as you are through the second length, there's no reason to run different gages. These infrastructure items payback is over a long period as service life is quite long, so look at it that way. You can use it as a selling point if you depose of it beforehand or put a board up near the circuit breaker stating allowable so the next one who follows your footsteps knows. You don't have to go too far like running electric ovens or a lot of high demand items but be sensible on size for what 99% of population will use your shed for. Then your just limiting the usage and eventual price of your building. Why limit usage over a little sum, Generally the service will outlast you so the next person along won't know of limitation and go full hog, unless they get it checked then they really know. You may have the welder running with lights and electric heater the whole shed lit up like a christmas tree for whatever reason for a short period of time and need the capacity. i would look at worst case and go a little extra capacity not the other way around. Maybe there is a electrican on the board. The open air cable may be smaller after all. I believe that there are different sizes for open air runs as opposed to direct burial or in underground conduit. ![]() Upon rereading your question, it seems that the first 50 feet may be buried while the last 100 feet will be in open air. You can also talk to your local building department. I would suggest that you get a copy of the NEC and read it. Otherwise, just live with the small Voltage drop that you get with the smaller wire. ![]() I would run the same gauge wire the whole distance and if you want to save the Voltage drop, oversize it for the whole run. I guess you would save some of the Voltage drop, but I doubt it will be worthwhile. So, there would be little reason to use the larger wire for part of the run. It will be smaller than the current that the larger wire could carry. I can not quote the code, but I do know that the breaker is sized to protect the wire so the breaker would be sized for the smallest wire size in that run. I do not think any electrician would do such a thing. ![]()
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