What are the requirements for connecting a motor feed wire (250 MCM THHN) to the 2/0 class F motor leads? Is a section of 250 MCM 1800C wire required between the 250 MCM THHN feeder wire and the 2/0 motor leads? We are seeing signs of heating on the THHN insulation near the connection. The 2/0 motor leads extend out from the motor about 6 inches. The motor is rated 460V, 3ph, 250 hp with 6 leads.