What is a main distribution panel (MDP) and what are its key components?

A main distribution panel (MDP) is the central point where incoming power is received and distributed to various circuits in a building. Key components include main breaker or fused switch for overcurrent protection, bus bars for power distribution, individual circuit breakers for branch circuits, neutral and ground bars, and metering equipment. The MDP must be rated for the building's total calculated load with appropriate fault current rating.