The distribution board has the characteristics of small volume, simple installation, special technical performance, fixed position, unique configuration function, no site restriction, common application, stable and reliable operation, high space utilization, less land occupation and environmental protection effect. It is the control center for commanding various components in the power supply line to reasonably distribute electric energy. It is the control link for reliably receiving the upper power supply and correctly feeding out the load electric energy. It is also the key to obtain the user's satisfaction with the power supply quality. Improving the operational reliability of power distribution board is not only the laying of family circuit, but also a crucial link. The installation of family distribution board is related to the safety of household electricity.