In order to monitor and manage the electric power consumption and distribution in a building or a house dispersedly implemented digital power meters are utilized, while the meters are very costly due to the complicated numerical operation or due to the multi-functionality such as measurements of reactive power, power factor, integrating power and so on. Therefore a simple combination of current transformer (CT) and potential transformer (PT) with post processing of collected data is used for energy usage diagnosis process. However, as long as the power lines are usually behind the walls the CT installation is not easy. In this paper a set of voltmeters dispersedly installed at power outlets is proposed as a monitoring system for power distribution to each outlet. Experimental results show the advantage of the proposed scheme in the sense that it does not disturb the usage of electric appliances and that the system configuration is simple. The proposed system was applied to the monitoring system for avoiding overload conditions or power losses.