Abstract: A clamp-on multiple lug buss bar assembly that is attached to the electrical terminal stud that extends upwardly from the top surface of an electrical power transmission transformer that is used in an underground transformer vault. After its installation, a mold is placed thereover with its bottom edge contacting the top surface of the transformer. The height of the mold is such that it covers the top edge of the conductor plates that form part of the buss bar assembly. Additionally the mold has risers extending up from its top surface that surround the bottom end of the spade connector fingers extending upwardly from the conductor plates. The cavity of the mold is filled with an epoxy resin and when it has set forms a water tight casing for the electrical conductor plates, the electrical terminal stud extending upwardly from the transformer and the top wall of the transformer.