I love this product because it's so easy for me personally as an electrician who installs these systems myself with no help from my employer what kind of wire do you mean? It was very simple just like they said in their manual but we have had our ups downs when installing them ourselves however once installed there were not many problems encountered over time. We are using two 1 kw units one at each end house connected into 3 phase power supply where both ends use same voltage level therefore only single transformer needed.