An electrical system (500) is positioned beneath an access floor (30) and includes a number of access floor modules (502) for providing electrical power locations for energizing electrical devices. Cable assemblies (578) electrically interconnect the modules (502) to the power source and to each other. Junction blocks (518) are mechanically connected to the access floor modules (502). Electrical receptacle blocks (562) are electrically interconnected to the junction blocks (518) for supplying power to interconnected electrical devices.