Open installation means the box is mounted directly on the surface of a wall, making it easy to access and service. It helps control and distribute electricity to different areas. This article discusses the construction of the distribution box, its functional divisions. A distribution box uses MCBs, RCDs, and busbars to protect circuits, prevent shocks, and ensure safe power distribution in homes and buildings. If you know. This Code of Practice provides the details of the general principles to be applied to the design of distribution substations, including substations located at ground floor, basement, upper floor level including at high level in high rise building and outdoor areas.