ABB ENFBAFFZECDDZEL BUSWAY, RELIA GEAR SERIES BUSWAY, GRAY, STANDARD, 54IN, 4000A, 3 PHASE 4 WIRE, 600V MAXIMUM, 200KA FOR 3 CYCLES, 200KA FOR 1 SEC, AND 149KA FOR 3 SEC, TIN PLATED COPPER BUS, BUSWAY, NEMA BU-1, FEDERAL SPECIFICATION W-B-811B, CSA