The installation of small power distribution units is a key step to ensure the normal operation of the power system and the safety of electricity consumption. Reasonable installation is crucial to maintaining power supply and preventing safety accidents. First of all, as an important part of electricity measurement, the small power distribution unit is installed at the user's electricity entrance. It can accurately record the usage of electricity, provide accurate metering data to the power company, and ensure that users pay according to actual electricity consumption. Secondly, the reasonable installation of small power distribution units can facilitate power maintenance personnel to carry out monitoring and repair work, and improve the operation and maintenance efficiency of the power system. In addition, reasonable design and installation of small power distribution units can also help prevent electrical fires and other safety hazards, ensuring a safe and stable electricity environment. Therefore, the rational installation of small power distribution units not only meets the measurement needs, but is also related to the reliability of the power system and the safety of users' electricity use, which has important practical significance.