This discussion led me to some experimentation in creative mode to get some tin cables to overload from amperage (so that I could work from there to figure out the minimum safe setup), and I couldn't figure out how to over-amp them deliberately - I had three 1x tin cables fed by 6 basic gas turbines and feeding a 4-slot battery buffer, which in turn fed another 4-slot battery buffer with a 1x tin cable, and none of them even caught on fire. Is that a bug, or am I missing something?
How many batteries were in the buffers? Buffers only input and output 1A per battery inside.