Main Distribution Board (MDB) is a panel from where electrical energy is taken out to distribute power to various consumer points. It typically has a single or multiple incoming power sources and includes circuit breakers and protection devices.
An MDB is a panel or enclosure that houses circuit breakers and ground leakage protection units where the electrical energy, which is used to distribute electrical power to numerous individual circuits or consumer points, is taken in from the transformer or an upstream panel. An MDB typically has a single or multiple incoming power sources and includes main circuit breakers and residual current or earth leakage protection devices. A MDB is comprised of a freestanding enclosure, a bus bar system, MCCB’s, metering and support equipment’s and required current transformers. Panels are assembled in a systematic manner such as incomer section and outgoing section.
MDB then feeds SMDBs, which is installed generally at the point where a large distribution cable terminates and several smaller sub-circuits start