هادی‌های تک مفتولی ( کلاس 1 )

Class 1 , Solid Conductors for Single & Multi Core Cables

1	2	3	4
Nominal Cross Sectional Area ( mm²)	Maximum Resistance of conductor at 20 °C
	Circular, Annealed Copper Conductors		Aluminum and Aluminum Alloy Conductors, Circular or Shaded ( Ω / km )
	Plain ( Ω / km )	Metal Coated ( Ω / km )
0.5	36.0	36.7	–
0.75	24.5	24.8	–
1.0	18.1	18.2	–
1.5	12.1	12.2	–
2.5	7.41	7.56	–
4	4.61	4.70	–
6	3.08	3.11	–
10	1.83	1.84	3.08 a
16	1.15	1.16	1.91 a
25	0.727	–	1.20 a
35	0.524	–	0.868 a
50	0.387	–	0.641
70	0.268	–	0.443 b
95	0.193	–	0.320 b
120	0.153	–	0.253 b
150	0.124	–	0.206 b
185	0.101	–	0.164 b
240	0.0775	–	0.125 b
300	0.620	–	0.100
400	0.0465	–	0.0778
500	–	–	0.0605
630	–	–	0.0469
800	–	–	0.0367
1000	–	–	0.0291
1200	–	–	0.0247
a ) Aluminum conductors , 10 mm² to 35 mm² circular only . b ) For single core cables , for sect oral shaped conductors may be assembled into a single circular conductor the maximum resistance of the assembled conductor shall be 25% of that of the individual component conductors .