 # How to confirm the sizes of flat copper busbar

Standard Copper Bar Current CapacityEstimation method:Single copper bus bar current capacity= width(mm)*thickness coefficientDouble copper bus bar current capacity= width(mm)*thickness coefficient*1.5

# Standard Copper Bar Current Capacity

### Estimation method:

Single copper bus bar current capacity= width(mm)*thickness coefficient

Double copper bus bar current capacity= width(mm)*thickness coefficient*1.5 (empirical coefficient)

Copper bar and aluminum bar can also be estimated as square terms, usually copper should be 5-8A/sq, Aluminum should be 3-5A/sq.

### Common copper bar current capacity method:

Copper bar current capacity when 40℃ = bar width(mm)*thickness coefficient

(thickness coefficient is 20 when bar width is 12(mm);it is 18 when bar width is 10; it is successively: [12-20,10-18,8-16,6-14,5-13,4-12]

Double copper bars[40℃]=1.56-1.58*single copper bar[40℃] (according to the size of section)

Three layers copper bars[40℃]=2*single copper bar[40℃]

Four layers copper bars 40[℃]=2.45*single copper bar[40℃] (not suggested option,replacing with special bus bar is better.)

Copper bar[40℃]=0.85*copper bar[25℃]

Aluminum bar [40℃] =1.3*copper bar[25℃]

For example: To count the 100*10 section copper bar current capacity,

One layer:100*18=1800(A)

Two layers:Current Capacity of 2( 100*10) is :1860*1.58=2940(A)

Three layers:Current Capacity of 3( 100*10) is :1860*2=3720(A)

### Common copper bar sizes and current capacity form:

1. Rectangular copper bar 2. Copper conducting wire current capacity 3. Drawer conducting wire choosing standard How to choose the sizes of flat copper busbar if you know the current and using enviroment.

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