An electrical chamber is disclosed herein. The electrical chamber can include at least one wall forming a cavity, where the at least one wall includes a first end and an 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 bridge, a first underhang, and a first isolation zone inner surface, where the first bridge protrudes inward toward the cavity from the inner surface, and where the first underhang extends from a distal end of the first bridge. The cavity can be configured to receive at least one electrical conductor. The cavity and the first isolation zone can be configured to receive a potting compound.