To size to bonding jumper from rod to rod is not clear. 250.53(c) states to use 250.66 to select the size wire to bond electrodes together. The rule of 250.66(a) is for the sole connection to the rod is not required to be larger then #6 copper. My question is : to comply with 250.58 to have a common grounding electrode , if one service is on each in of a building and the only electrodes used are ground rods, the gec from rod to rod should be selected from table 250.66 and not 250.66(a) correct me if I am wrong...
