Square D PK12GTA Qo Equipment Ground Bar Assembly Brand: Square D. Part Number: PK12GTA. Square D QO Equipment Ground Bar Assembly, 4.7 in Length, 12 Terminals, 14 to 4 AWG Conductor, For Use with: QO Load Center and Type PK Circuit Breaker. Additional Description: SQD -PK12GTA LOAD CENTER EQUIPMENT GROUND BAR ASSY. Catalog Description: Load center accessory, QO/Homeline, ground bar kit, 12 terminals..