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HOW TO SELECT AN INSTRUMENT TRANSFORMER > Selecting a Current Transformer 
   

Permissible Current in a Busbar

 Permissible Current in a Busbar | Accuracy of Current Transformers | Important Warning for CT's


 
Ambient temperature = 30°C
Maximum busbar temperature rise = 40°C
Bars on edge
Busbar spacing equal to thicknes of 1 bar
Permissible current in Amps

Current in a busbar
BarCopperCopperCopperCopperAluminiumAluminiumAluminiumAluminium
size (mm)
1 bar 2 bars 3 bars 4 bars 1 bar 2 bars 3 bars 4 bars
20 x 5320570730940190340430570
30 x 5460820105013803606408201080
40 x 5550990126016504307709801290
50 x 565011701490195051091011701530
60 x 5840151019302520660118015101980
80 x 51000180023003000780140017902340
100 x 51200216027603600940169021602820
160 x 518003240414054001410253032404230
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