Current carrying capacity of a single copper bus =
Width (mm)
X
Thickness coefficient
Double bus carrying capacity =
Width (mm)
X
Thickness coefficient
X
1.5 (empirical coefficient)
Copper bars and aluminum bars can also be square, usually 5-8A/ square for copper bars and 3-5A/ square for aluminum bars.
Calculation method of current carrying capacity of common copper busbar;
Current carrying capacity of copper bar at 40℃ = width * thickness coefficient.
Line width (mm); The thickness coefficient is: 20 when the bus bar 12 is thick; 18 when it is thick; They are: [12-20,10-18,8-16,6-14,5-13,4-/kloc-0.
Double copper bar [40℃]= 1.56- 1.58 Single copper bar [40℃] (depending on cross-sectional size)
3-layer copper bar [40℃]=2-layer copper bar [40℃]
4-layer copper bus [40]= single-layer copper bus [40]* 2.45 (this option is not recommended, it is better to use a special-shaped bus instead).
Copper platoon [40℃]=
Copper platoon [25℃]*0.85
Aluminum platoon [40℃]=
Copper platoon [40℃]/ 1.3
For example, find the bearing capacity of TMY 100* 10 as follows:
Single layer:100 *188 =1800 (a) [1860a reference manual];
Double deck: the current carrying capacity of 2(TMY 100* 10) is:1860 *1.58 = 2940 (a); [Refer to the manual of 2942a];
The third floor: the current carrying capacity of the third floor (TMY 100 * 10) is: 1860 * 2 = 3720(a)[3780 a reference manual].