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

Bar	Copper	Copper	Copper	Copper	Aluminium	Aluminium	Aluminium	Aluminium
size (mm)	1 bar	2 bars	3 bars	4 bars	1 bar	2 bars	3 bars	4 bars
20 x 5	320	570	730	940	190	340	430	570
30 x 5	460	820	1050	1380	360	640	820	1080
40 x 5	550	990	1260	1650	430	770	980	1290
50 x 5	650	1170	1490	1950	510	910	1170	1530
60 x 5	840	1510	1930	2520	660	1180	1510	1980
80 x 5	1000	1800	2300	3000	780	1400	1790	2340
100 x 5	1200	2160	2760	3600	940	1690	2160	2820
160 x 5	1800	3240	4140	5400	1410	2530	3240	4230

Current in a busbar