Electrical Revolution: Bus bar And Bus bar Chamber

The incoming supply to bus bar is controlled by switch fuse unit or MCB.
The outgoing circuit from bus bar to load point is controlled by switch fuse unit.
The bus bar chamber is a heart of switch fuse unit and it is main junction of incoming and outgoing line.
The bus bar is made of aluminum or copper strip.
There are four bus bar requires for supply system of 3 – Phase, 4 – wire.
There are 3 strips used for phase connection and one strip for neutral connection.
The bus bar strip is mounted on Bakelite, Porcelain or insulating material.
The length and width of the bus bar strip depends upon the current passing through strip.
The outgoing connection through bus bar chamber is taken through wire or bus bar strip.
The joint of bus bar strip is done through other material but in order to avoid corrosion it should be painted.
There are two supports requires for 1 meter length of bus bar.
The switch board and Distribution board is mounted on wall by using of frames.

The following things to be noted for bus bar connection.

The length of bus bar chamber should be 10 meter more than that of length of bus bar.
The distance between two feeders for each bus bar should be at least 5 cm.
If the current capacity is 200 Amp then it is 5 cm and for 400 Amp, it should be 10 cm.
The minimum distance between end of bus bar and support should be 3 cm.
There is only one connection for each hole provided in the bus bar. The connection of round bus bar is through nut bolt and clamp.

The supply in the High rise building and complex is given through bus bar chamber.
There are 4 copper strips / aluminum strip is used in the bus bar chamber.
There is one incoming line and one or more outgoing line is used.
The size of the bus bar chamber depends upon following factors.
The size of bus bar depends upon current capacity of the bus bar.
The switch number and rating is given to the bus bar chamber.
The bus bar chamber is made of 16 SWG Mild steel sheets.
If the current capacity is 400 Amp, the size of the bus bar should be 50 mm * 5 mm copper and 50 mm * 10 mm aluminum.

Number of Epoxy / Porcelain insulator per Phase = 3

Aluminum / Copper bus bar length in ( mm ) = 1000

Dimension of Bus bar Chamber *L H * B ( mm )**	Current rating ( Amp )	Rectangle Cross section
		Copper		Aluminum
		No. of Strips / Phase	Size ( mm )	No. of Strips / Phase	Size ( mm )
1150 * 400 * 150	100	1	20 * 5	1	25 * 5
1150 * 400 * 150	200	1	30 * 5	1	40 * 5
1150 * 400 * 150	300	1	40 * 5	1	50 * 5
1150 * 500 * 300	400	1	50 * 5	1	50 * 10
1150 * 500 * 150	630	-	-	2	40 * 10
1150 * 500 * 300	800	-	-	2	50 * 10