If I'm running #10 conductors due to voltage drop from a 20A overcurrent device, would I be able to use a #12 bonding jumper at a j-box? All conductors are #10 including the EGC. Table 250.122 shows a #12 copper for a 20A Overcurrent Device. Just want to know if I can use a #12 bonding to the box or I would have to use the same size (#10) as the Equipment Grounding Conductors.