We have a project that called for 20 amp lighting contactors with lugs that have #10 maximum conductor size. Because of distance the wire size is #8. We had planned on using a #8 to #10 wire termination reducer at the contactors but the electrical engineer said we would need to go to a larger contactor with larger lugs because the wire reducer would choke down the electricity and defeat the purpose of over sizing the wire. Just would like to hear some thoughts.