We controlled the supply of our house from this distribution board with the help of main switch or circuit breakers; when we change the position of the main switch button, the whole supply of the installation is becomes dead. Large installations such as flats, commercial building etc. have several distribution boards. Every distribution board supply electricity to one floor of the building.
In large installations, all the distribution boards are controlled from main distribution board. The incoming supply of the main distribution board is three-phase. From main distribution board, we obtain the phases and every phase supplying electricity to one floor or more than one floor of the building. It is remember That, every floor has its own distribution board. For domestic premises, it is always recommended that the single phase supply is introduced.
The protective devices (fuses, circuit breaker) must be capable of opening the circuit instantaneously in case of short circuit.
“A distribution board is a unit .which consists on one or more protective devices against over current. The distribution hoard also delivered electrical energy to the circuits of, installation”.
In fig (51.1). (5.2.1), (5.3.l).and (5.4.1) distribution of electrical supply.
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