Square D PK27GTA Qo Equipment Ground Bar Assembly Brand: Square D. Part Number: PK27GTA. Square D QO Equipment Ground Bar Assembly, Surface Mount, 9.36 in Length, 27 Terminals, 14 to 4 AWG Conductor, For Use with: QO Load Center and NQ Panelboard. Additional Description: SQD -PK27GTA LOAD CENTER EQUIPMENT GROUND BAR ASSY. Catalog Description: Load center accessory, QO/Homeline, ground bar kit, 27 terminals..