هادی‌های نیمه افشان ( کلاس 2 )

Class 2 , Stranded Conductors for Single & Multi Core Cables

1	2	3	4	5	6	7	8	9	10
Nominal Cross Sectional Area ( mm²)	Maximum Number of Wires in the Conductor						Maximum Resistance of conductor at 20 °C
	Circular		Circular Compacted		Shaped		Annealed Copper Conductors		Aluminum or Aluminum Alloy Conductor ^c ( Ω / km )
	Cu	Al	Cu	Al	Cu	Al	Plain Wires ( Ω / km )	Metal Coated Wires ( Ω / km )	Aluminum or Aluminum Alloy Conductor ^c ( Ω / km )
0.5	7	–	–	–	–	–	36.0	36.7	–
0.75	7	–	–	–	–	–	24.5	24.8	–
1.0	7	–	–	–	–	–	18.1	18.2	–
1.5	7	–	6	–	–	–	12.1	12.2	–
2.5	7	–	6	–	–	–	7.41	7.56	–
4	7	–	6	–	–	–	4.61	4.70	–
6	7	–	6	–	–	–	3.08	3.11	–
10	7	7	6	6	–	–	1.83	1.84	3.08
16	7	7	6	6	–	–	1.15	1.16	1.91
25	7	7	6	6	6	6	0.727	0.734	1.20
35	7	7	6	6	6	6	0.524	0.529	0.868
50	19	19	6	6	6	6	0.387	0.391	0.641
70	19	19	12	12	12	12	0.268	0.270	0.443
95	19	19	15	15	15	15	0.193	0.195	0.320
120	37	37	18	15	18	15	0.153	0.154	0.253
150	37	37	18	15	18	15	0.124	0.126	0.206
185	37	37	30	30	30	30	0.0991	0.100	0.164
240	37	37	34	30	34	30	0.0754	0.762	0.125
300	61	61	34	30	34	30	0.0601	0.0607	0.100
400	61	61	53	53	53	53	0.0470	0.0475	0.0778
500	61	91	53	53	53	53	0.0366	0.0369	0.0605
630	91	91	53	53	53	53	0.0283	0.0286	0.0469
800	91	91	53	53	–	–	0.0221	0.0224	0.0367
1000	91	91	53	53	–	–	0.0176	0.0177	0.0291
1200	b						0.0151	0.0151	0.0247
1400	b						0.0129	0.0129	0.0212
1600	b						0.0113	0.0113	0.0186
1800	b						0.0101	0.0101	0.0165
2000	b						0.0090	0.0090	0.0149
2500	b						0.0072	0.0072	0.0127
a ) These sizes are non-preferred. Other non-preferred sizes are recognized for some specialized applications but are not within the scope of this standard. b ) The minimum number of wires for these sizes is not specified . These sizes may be constructed from 4 , 5 or 6 equal segments ( Milliken ). c ) For stranded aluminum alloy conductors having the same nominal cross sectional area as an aluminum conductor the resistance value should be agreed the manufacturer and the purchaser .