- Boxes should be securely installed in the correct position with complete components, and the installation height should meet design and maintenance requirements. - Wiring inside the box should be neat without twisting; connections should be tight without damaging the wire. Due to the long time interval between the embedding of the box and the installation and wiring of the box panel, the box shall be disassembled with the box cover (door) and the panel first, and marked for storage, so as to prevent the electrical components and the box cover (door) from damage or. - Before connecting the power supply lines, confirm that the surge protective device (SPD) model and performance parameters meet the design requirements, and the grounding wire is reliably connected to the PE bar. Browse specifications, literature, drawings, videos and tools that make planning and specifying. In this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Choose the right box based on environment (indoor/outdoor), load capacity, and durability. Check for proper IP/NEMA ratings and material quality. Ensure safe placement: install in. The invention discloses a kind of pre-embedded construction method of electrically concealed junction box, this method lays electric pipeline first, by the leading-out terminal Pass line adjustment of electric pipeline to consistent, the outlet end position of electric pipeline opens up the. 1)The distribution box shall be installed in a concealed way. When building the wall, the reserved hole shall be about 20mm larger than the length and width of the distribution box.