This document provides specifications for various distribution boxes including dimensions, mounting sizes, and number of ways. It stipulates requirements for enclosure materials, installation dimensions, the mandatory "one equipment, one switch, one RCD" rule, mechanical structure, earthing systems. This publication contains the following new or updated information. This list includes substantive updates only and is not intended to reflect all changes. 10. The metal distribution box is designed for a wide range of low-voltage applications in residential buildings, commercial complexes, offi ces, and industrial facilities.