A power feeder device (100; 700) can include a base (101; 701) having a mounting portion (103; 703) and a plurality of connector structures (105; 705) extending from the mounting portion and spaced apart relative to each other to form a respective gap (107) therebetween. Each connector structure can be configured to receive a respective pair of terminals (109; 719a, 719b) to electrically connect the respective pair of terminals within connector structures and to block a line of sight between adjacent pairs of terminals. The device can also include a cover (111; 711) configured to mate with the base to enclose each of the plurality of connector structures and to increase a length of a creepage path between each pair of terminals by at least partially inserting into each gap between the connector structures. The base and the cover can be configured to form a terminal opening (113; 713) on each lateral side when assembled to allow pass-through of a conductor and/or portion of each terminal. In certain embodiments, at least one of the terminals of the respective pair of terminals can be a bus bar extending from a bus bar chassis (721) and the base and/or the cover can form a creepage barrier (723a, 723b) that extend into a chassis wall opening (725) of the bus bar chassis to increase a length of a chassis creepage path from the respective pair of terminals to the bus bar chassis.