A low voltage power receptacle assembly is provided for use in a modular electrical system. The receptacle assembly includes a housing that defines an internal cavity for receiving and protecting various high and low voltage electrical components, and for providing convenient access to low voltage power outlets associated therewith. The receptacle assembly houses at least two electrical bus bars that are spaced apart and that conduct line voltage received from a relatively high voltage power input. A low voltage transformer has at least two electrical contacts for engaging the electrical bus bars, and is operable to convert the line voltage to a lower output voltage at the power outlets. An isolator body has a non-conductive wall positioned between the electrical bus bars to maintain electrical isolation thereof.