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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