Aluminium Bus Bars for power distribution give an economic advantage compared to copper bars due to the lower cost of aluminium and to a significant difference in the weight / volume.In fact aluminium bars weigh up to 70% less than copper bars, compared with a reduction in electrical capacity of only about 30%.The use of aluminium bars for carrying electrical current is therefore recommended in switchboards, distribution equipment and systems where there are no space problems, or where weight reduction is critical.Aluminium bars with different corners are available with many Thickness and many lengths.

CURRENT CARRIYING CAPACITY OF ALUMINIUM AT  35 °C
Size in  (mm)	Area  (mm²)	Weight   (kg/m)	Current  Carriying  Capacity  in Amp - 50 Hz A.C/D.C
			A.C( no. of bus)				D.C( no. of bus)
			I	II	III	IIII	I	II	III	IIII
12X2	24	0,0633	80	140			80	145
15x2	30	0,0795	90	160			95	175
15x3	45	0,12	110	200			115	220
20x2	40	0,107	115	210			125	225
20x3	60	0,161	140	255			150	280
20x5	100	0,268	185	330			200	370
25x3	75	0,201	170	315			185	340
25x5	125	0,335	220	410			235	440
30x3	90	0,242	195	365			275	520
30x5	150	0,403	255	475			220	400
40x3	120	0,323	265	475			285	525
40x5	200	0,538	330	620			360	660
40x10	400	1,08	490	925			540	1000	1420
50x5	250	3,637	405	740	1070	1430	445	815	1220
50x10	500	1,35	595	1090	1520	2050	655	1220	1730
60x5	300	0,808	490	925	1260	1700	530	960	1420	1850
60x10	600	1,62	695	1260	1800	2380	770	1430	2030	2600
80x5	400	1,08	645	1110	1570	2120	700	1250	1850	2400
80x10	800	2,16	890	1620	2240	3000	985	1840	2640	3400
100x5	500	1,35	780	1370	1900	2470	855	1550	2220	2900
100x10	1000	2,7	1100	1950	2650	3500	1200	2240	3200	4200
100x15	1500	4,04	1400	2400	3200	4200	1500	2750	4000	5200
120x10	1200	3,24	1300	2280	3100	4100	1500	2750	3900	5100
120x15	1800	4,86	1550	2750	3700	4750	1420	2700	3900	6300
160x10	1600	4,32	1650	2850	3950	5050	1750	3250	4800	6300
160x15	2400	6,47	2000	3400	4600	5950	1850	3450	5000	6500
200X10	2000	5,4	2150	3650	4950	6400	2300	4300	6200	8100
200X15	3000	8,09	2550	4200	5600	7300	2850	5250	7650	10100
CURRENT CARRIYING CAPACITY OF COPPER AT  35 °C
Size in  (mm)	Area (mm²)	Weight (kg/m)	Current Carriying  Capacity in  Amp - 50 Hz A.C/D.C
			AC ( no. of bus)				DC ( no. of bus)
			I	II	III	II II	I	II	III	II II
12X2	24	0.209	110	200			115	205
15X2	30	0.262	140	200			145	245
15X3	75	0.396	170	300			175	305
20X2	40	0.351	185	315			190	325
20X3	60	0.529	220	380			225	390
20X5	100	0.882	295	500			300	510
25X3	75	0.663	270	460			275	470
25X5	125	1,10	350	600			355	610
30X3	90	0.796	315	540			320	560
30X5	150	1,33	400	700			410	720
40X3	120	1,06	420	710			430	740
40X5	200	1,77	520	900			530	930
40X10	400	3,55	760	1350	1850	2500	770	1400	2000
50X5	250	2,22	630	1100	1650	2100	650	1150	1750
50X10	500	4,44	920	1600	2250	3000	960	1700	2500
60X5	300	2,66	760	1250	1760	2400	780	1300	1900	2500
60X10	600	5,33	1060	1900	2600	3500	1100	2000	2800	3600
80X5	400	3,55	970	1700	2300	3000	1000	1800	2500	3200
80X10	800	7,11	1380	2300	3100	4200	1450	2600	3700	4800
100X5	500	4,44	1200	2050	2850	3500	1250	2250	3150	4050
100X10	1000	8,89	1700	2800	3650	5000	1800	3200	4500	5800
120X10	1200	10,70	2000	3100	4100	5700	2150	3700	5200	6700
160X10	1600	14,20	2500	3900	5300	7300	2800	4800	6900	9000
200X10	2000	17,80	3000	4750	6350	8800	3400	6000	8500	10000
Various common Cases are listed as below with minumum cross -section needed in mm² for Busbar
Material	Fault level (KA)	Withstand time
		1 sec.	200 msec.	40 ms.	10 ms.
		mm²	mm²	mm²	mm²
Aluminium	35	443	198	89	44
	50	633	283	127	63
	65	823	368	165	82
Copper	35	285	127	57	28
	50	407	182	81	41
	65	528	236	106	53