- For surface-mounted distribution boxes on the wall, the indoor ceiling, wall, and decoration should be completed before installation; for flush-mounted control (distribution) boxes, the reserved holes, and conduits for power and lighting wiring should be. - For surface-mounted distribution boxes on the wall, the indoor ceiling, wall, and decoration should be completed before installation; for flush-mounted control (distribution) boxes, the reserved holes, and conduits for power and lighting wiring should be. trial applications. The Mirage range of practical f outgoing devices. * For different colours and thickness, please r DETAILSThe installation of electrical riser lines and distribution boxes is of paramount importance to the integrity and functionality of the entire electrical system. - The ground leveling layer should be completed. Check for proper IP/NEMA ratings and material quality. Additionally site team will need detailed information of all aspects associated with the installation process in order to complete the job inline with the. This methodology document highlights the technical guidelines for the installation of Electrical Distribution Boards (DBs). Respective electrical rooms, LV.