Wires on the high sides of transformers are overloading when you try to use the wire at max capacity. I tried different loads, different wires, and different combinations of transformers. When 20kW of transformer draw is placed on heavy watt wire, it will break. When 2kW of transformer draw is placed on conductive wire, it will break. Etc. As you can see in the energy tab, the transformer draw totals 20kW. From the mouse over you can see the current load is at capacity. Yet the wire (in this case a bridge, but it will break just wire as well) overloads.
This is not consistent with previous behavior. We were able to have 5 large transformers on heavy watt wire before without issues, as well as 2 small transformers on conductive wire.
Place transformers equal to a wire's capacity. Place generators on the high side generating more than wire's capacity. Place consumers on the low side demanding more than the wire's capacity (or batteries). The high side wire will overload. It shouldn't overload, and hasn't in the past.