A mounting assembly for an electrical fixture can include an upper unit and a lower unit that be releaseably retained together and including respective contacts that touch when the upper and lower units are retained together to create an electric pathway. The units can further include respective contacts for a neutral or ground connection. The assembly can also include a device in electrical contact with both of the contacts of the lower unit to draw power. The lower unit can also include a third contact and a power distribution circuit to deliver a level of electrical power to the third contact that is different than power available through the other contact of the lower unit. In a system of the mounting assemblies, each mounting assembly can include also include a transceiver to communicate with one another.