Abstract: A closed door operation racking device is provided for racking a circuit breaker to and from a power bus from outside of a housing of a motor control center unit. The racking device includes a racking operator assembly and a push-button interlock assembly. The racking operator is configured to rack-in the electrical device and connect the stabs to a power bus in a connected position and to rack-out the electrical device and disconnect the stabs from the power bus in a disconnected position. The push-button interlock assembly prevents the operation of the racking operator under certain conditions, and includes a spring-loaded locker assembly and a spring-loaded push-button operator assembly. A push-button operator of the push-button operator assembly is depressed to disengage the locker assembly from the racking operator to allow operation of the racking operator.

Abstract: The inventive rack positioning assembly for an electric panel comprises a vertical busbar (J2) for distributing electric current to electric appliances, said busbar comprising several bars, which are positioned in a same vertical plane and on which it is provided to connect racks of the electric panel, and several rack positioning modules (20), which are positioned above one another and which surround the bars of the vertical busbar. The positioning modules (20) comprise means (50) for increasing the insulation distance between the bars at the interface between two successive modules, that insulation distance corresponding to the length of the electric creep path between the bars.