3 April 2019

Bus bar And Bus bar Chamer

  • 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.

BUS BAR CHAMBER

  • 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.

Distance between Bus bar For Given Voltage


SR. NO
VOLTAGE
CLEARANCE IN MM
BETWEEN PHASE
BETWEEN PHASE TO EARTH
1
415 V
19
16
2
0.6 kV
25
19
3
3.3 kV
51
35
4
11 kV
127
77
5
22 kV
242
140
6
33 kV
356
223

Dimension of bus bar Chamber, its Size and Number of Strips for Given Current Rating

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

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