EC2GB series ground bars are intended for use in Siemens ES and PL series of load centers with a box height of 18, 21, 23, 24, 27, 30, 35, or 36 inches. For the ES and PL lines of load centers this would include up to 200A load centers that have 40 1-Inch circuit spaces or less. The ground bars can be mounted in one of 4 locations inside the load center: top right, top left, bottom right, and bottom left. Up to 4 ground bars can be added to each load center.