An isolator sub is disclosed. The isolator sub can include a first rod having a first coupling feature disposed at a first end. The isolator sub can also include a second rod having a second coupling feature disposed at a first end, where the first rod is electrically conductive. The isolator sub can further include an isolator made of an electrically non-conductive material and having a first complementary coupling feature and a second complementary coupling feature, where the first coupling feature couples to the first complementary coupling feature, and where the second coupling feature couples to the second complementary coupling feature. The isolator sub can also include an outer housing coupled to the first rod, the second rod, and the isolator, where the outer housing is electrically conductive and has at least one third coupling feature configured to electrically couple to an electrical cable.