The distribution box shall be installed firmly, horizontally and vertically, and the vertical deviation shall not be greater than 3 mm; in case of concealed installation, there shall be no gap around the distribution box, the edge around the panel shall be close to the wall, and. The distribution box shall be installed firmly, horizontally and vertically, and the vertical deviation shall not be greater than 3 mm; in case of concealed installation, there shall be no gap around the distribution box, the edge around the panel shall be close to the wall, and. Additional services are permitted for the six reasons listed in 230. These include fire pumps and emergency systems. Additional services are permitted for either multiple-occupancy buildings where there's insufficient space for supply equipment accessible to all. Wall mounting is the most common installation method. Based on the installation form, it can be divided into surface mounting and concealed mounting methods, each with its own characteristics; the appropriate solution should be selected based on the actual project conditions. The exposed bottom edge of the lighting box in the basement is 1. The NEC (National Electric Code) does allow an electric panel to be mounted horizontally, but only if vertical mounting is not possible due to space limitations or otherwise impractical (NEC 240. Unfortunately, a second code requirement is that when circuit breakers are mounted in a vertical.
