In recent years, wide-spread renewable energy sources (RES) including photovoltaic (PV) accelerates the voltage fluctuation problem in distribution networks. The induced issues have been indicated from early on, and many studies have already been reported. However, most of the previous studies have focused on high-voltage distribution networks, and to the authors' knowledge, there are few studies for low-voltage network issues. Therefore, the authors have so far studied desirable low-voltage distribution network configurations. In this paper, an efficient solution method for low-voltage network configuration problem is proposed to deal with uncertainties of PV output and load. The proposed method utilizes Interval Arithmetic (IA) for handling these uncertainties to find a comprehensive solution efficiently. To verify the effectiveness, the proposed method is tested through several numerical simulations with successful results.