কিভাবে ডিবি বক্স কানেকশন করবেন||How to MCB Db box connection||Distribution MCB Db box connection

What is Distribution Board?
Distribution board is a safe system designed for house or building that included protective devices, isolator switches, circuit breaker and fuses to connect safely the cables and wires to the sub circuits and final sub circuits including their associated Live (Phase) Neutral and Earth conductors. Distribution board is also known as “Fuse Board“, “Panel Board” or “Consumer Unit“. following are the types of Distribution boards.

Related Wiring Tutorial: Wiring of the Distribution Board (Single Phase Supply From Utility Pole & Energy Meter to the Consumer Unit)
Types of Distribution Boards

Main Distribution Board (MDB)
Sub Distribution Board (SDB)
Final Distribution Board (FDB)


MDB = Main Distribution Board:
A distribution board unit installed in the buildings which firstly receive the incoming single phase electric supply (AC low voltage (LV) (230V AC or 120V AC in US) from transformer secondary through electric pole and energy meter or the distribution company’s electric service provider outlets is known as Main Distribution Board.

Main Distribution Board (MDB) is also known as Fuse board or consumer unit where the main protective and isolation devices are installed to provide electricity in a safe range to the connected electrical appliances.

SDB = Sub Distribution Board:
The Distribution Board which is used to distribute electrical wiring and circuits within a selected area in a building or house, i.e. floor in a multi storey building. The Sub distribution board is connected and supplied from the Main Distribution Board through different wires and cables rated according to the load requirement.

FDB = Final Distribution Board:
The Distribution Board which provide electric supply to the Final and Sub Final Circuits is known as Final Distribution Board. FDB (Final Distribution Board) directly connected through SDB (Sub Distribution Board) and the final switches are used to control the connected electrical devices and appliances such as light, air-conditioner, fan etc.

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