An electrical transition fitting for enabling electrical wires contained in multiple cables to be extended through an electrical conduit, or into a panel box. The fitting has a lower body member having a first member dimensioned for receipt of an electrical conduit or passage through a knockout hole of a panel box, and a second member with a slot at a second end, an upper body member having at least three bores formed therein, the bores for receipt of the cables, the upper body member having a plate at a first end, the plate dimensioned for contact with a perimeter of the second member and having a tab for receipt in the slot, and a hole for receipt of a fastener to secure the upper body member to the lower body member and plastic insulators and inner locking devices for installation in the bores.