Abstract: A jumper assembly that includes a housing assembly and a plurality of bus assemblies. Each bus assembly has a planar member and one or more collar assemblies. The housing assembly has a plurality of upper raceways and one or more raceways provide access to each bus assembly collar. The raceways associated with different bus assemblies are separate from each other. The upper raceways having openings on the left and right sides of the housing assembly. The housing assembly has a connector structure on at least one of the left and right sides. The connector structure may be coupled to another jumper assembly.

Abstract: An interlock for electric power switches includes indicator followers each following a state indicator on an associated electric power switch indicating the open/closed state of the switch. A first coupler couples one end of an associated elongated connecting member to each indicator follower. A second coupler couples the other end of each elongated connecting member to an auxiliary trip member actuator which actuates an auxiliary trip member on another electric power switch to maintain it in the open/tripped condition when the associated electric power switch is in the closed condition. The first couplers include a swivel through which the elongated connecting member slides and a compliant member, preferably in the form of a helical compression spring, captured between the swivel and a stop nut on the one end of the elongated connecting member.