enblethen wrote:
What type of wiring goes between the house and the barn? It could be possible and less expensive to have this wire upgraded especially if it is aerial. Underground cost would be too high.
Did the electrician say which of the two taps he used? 16 or 32? If he used the 32, he could switch to the 16 and see what the levels are.
I suspect there are not two taps, but rather that 32V boost comes if you use it in a 240V circuit and 16V in a 120V circuit.
By the way, I suspect the barn is well over 40 years old. A subpanel in the mid 70's would not typically have screw-in fuses, and a large barn built at that time likely would have had more than a 30A 240V service installed. (At least in this part of the country, an old barn is more like 100 or 150 years old and built with post-and-beam construction.)