QO Load Centers offer premium features like QO breakers, ground arc fault interrupters and surge arresters. QO load centers are designed for residential and industrial use to protect electrical systems, equipment and people. Systems are single or three phase and have indoor and outdoor versions. QO Load Centers enable the use of a full complement of accessories. This grounding bar kit has five terminal connections. Each terminal connection will accept one 14 AWG to 4 AWG wire or two 14 AWG or 12 AWG copper wires. The grounding bar will also accept one 12 AWG to 4 AWG wire or two 12 AWG or 10 AWG aluminum wires The grounding bar is 2.25 inches long. The grounging bar is mounted directly to the back of the enclosure with two screws.