An electrical chamber can include at least one wall forming a cavity, where the at least one wall includes a first end and a wall inner surface. The electrical chamber can also include a first isolation zone disposed on the inner surface at a first distance from the first end, where the first isolation zone is formed by a first proximal wall, a first distal wall, and a first isolation zone inner surface disposed between and adjacent to the first proximal wall and the first distal wall, where the first proximal wall forms a first angle with the first isolation zone inner surface, where the first distal wall forms a second angle with the first isolation zone inner surface, where the first angle is non-perpendicular. The cavity is configured to receive at least one electrical conductor. The cavity and the first isolation zone are configured to receive a potting compound.