Preparing of Distribution Board

Preparing of Distribution Board Points : Preparing of Distribution Board Distribution boards are available in single phase or three phase construction. In fshows the different techniques to prepare the distribution board. If 3- Φ supply is available, first we control the 3-0 supply through 3- Φ main distribution board. In 3 - 0 main (D.B), the fuses and circuit breakers are installed. A main, 3 - pole switch is also available to out-off the supply.

After that we separate the each phase and neutral is common. Every phase and neutral wire is inserted in input terminals of double pole main switch. After that we give the output terminals of double-pole main switch to neutral and phase bus bars to the single phase distribution board.

From phase bus-bar we determine the phase wire and at every phase wire a fuse or circuit breaker is installed. After that this supply i used for electrical apparatus. In some D.F.B, box is made of metal and it is closed. A door is fitted with metal box; therefore, we can easily open or close the DF.B. In some D.F.B the door is also locked. Always earth the D.F.B by using earthing wire. In Φ D.F.B there are two bus bars making the making phase connection with neutal wire. In 3- Φ D.F.B four bus bars are used, three for phases and one for neutral. Always use the porcelain insulatar between bus bar and metal box. The number of fuses or C.B’s is equal to number of circuits, which are determined from the DF.B. The D.F.B is fitted on the wall by using screws. In last made the connections f bus bars to main supply and neutral wire is also connected to neutral B.B.