TEST AND CONNECTION APPARATUS ARRANGEMENT

A testing arrangement is provided for testing the electrical circuits of an assembly of terminal blocks arranged in side-to-side relation, each of the terminal blocks including two mutually-insulated collinearly-arranged horizontal bus bar sections that are normally electrically connected by first and second pairs of leaf spring contacts arranged above and below the bus bar sections, respectively. During the testing operation, the testing device may be arranged either above or below the assembly, and an insulating test plug on the testing device is inserted either vertically downwardly from above, or upwardly from below, the terminal block, thereby to disengage one pair of contacts. A dummy plug is vertically inserted in the opposite direction to disengage the other pair of contacts. The remote ends of the bus bar sections are provided with clamping devices for connection with the bare ends of insulated conductors, respectively.