My electrician just installed a Nema 14-50 in my garage. He used 6/3 NMD90 wire on a 50 amp breaker. The run is about 120 feet. The car is charging at a full 32 A, but the voltage is only 198 V. I knew there might be some small degradation given the length of the run, but less than 200 volts is of concern to me. Is there something wrong here?