Wiring a Distribution Board (DB) is vital in any electrical installation. All the electrical sub-circuits are originated from a Distribution Board. The main feeder cable to the Distribution board should be able to handle the total power anticipated when all the sub circuits in the Distribution Board are in use. A sub-circuit can be an electric cable distributing power to few lights, or a socket outlet through a MCB device or a fuse in the distribution board. We consider a Distribution Board with MCBs ( Miniature Circuit Breakers) for power distribution.