To protect the bus from faults, it is mandatory to disconnect it from all the power sources as soon as possible. This means that, breaker CB-1, 2, 3 & 4 must open during actuation of busbar protection. You might think that only CB-1 should open. Busbar protection is a protection scheme meant to protect the busbar from electrical fault. Double Busbar arrangement or one and half breaker scheme. With increasing short-circuit power in the network. Disadvantages: Single bus-bar system has the following three principal disadvantages:- The bus-bar cannot be cleaned, repaired or tested without de-energizing the whole system. Thus, it is an electrical junction where all incoming and outgoing currents connect. Always use appropriate personal protective equipment, such as safety glasses and insulated gloves, and verify circuits are dead using a multimeter.