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Conductors of Insulated Cables

IEC 60228 Solid aluminium and solid aluminium alloy conductors (Class1) Stranded circular non-compacted conductors,Stranded compacted circular conductors and stranded shaped conductors (class 2);Flexible conductors (classes 5 and 6) − plain or metal-coated annealed copper(coated with a thin layer of suitable metal, such as tin or tin alloy); − aluminium or aluminium alloy.

Classification:

Bare Conductor

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Application:

Conductors of Insulated Cables Specifies the nominal cross-sectional areas, in the range 0,5 mm2 to 2 500 mm2, for conductors in electric power cables and cords of a wide range of types. These conductors include solid and stranded copper, aluminium and aluminium alloy conductors in cables for fixed installations and flexible copper conductors.

Classification:

The conductors have been divided into four classes, 1, 2, 5 and 6. Those in classes 1 and 2 are intended for use in cables for fixed installations. Classes 5 and 6 are intended for use in flexible cables and cords but may also be used for fixed installations.

Materials

− plain or metal-coated annealed copper(coated with a thin layer of suitable metal, such as tin or tin alloy);

− aluminium or aluminium alloy.

− Class 1: solid conductors.

− Class 2: stranded conductors.

− Class 5: flexible conductors.

− Class 6: flexible conductors which are more flexible than class 5.

Solid conductors (class 1)

Solid aluminium and solid aluminium alloy conductors of sizes 10 mm2 to 35 mm2 shall be of circular cross-section. Larger sizes shall be of circular cross-section for single-core cables and may be of either circular or shaped cross-section for multi-core cables.

Solid copper conductors shall be of circular cross-section. Solid copper conductors having nominal cross-sectional areas of 25 mm2 and above are for particular types of cable, e.g. mineral insulated, and not for general purposes.

Stranded circular non-compacted conductors (class 2)

Stranded aluminium or aluminium alloy conductors shall have a cross-sectional area not less than 10 mm2. The wires in each conductor shall all have the same nominal diameter.

Stranded compacted circular conductors and stranded shaped conductors (class 2)

Stranded compacted circular aluminium or aluminium alloy conductors shall have a nominal cross-sectional area not less than 10 mm2. Stranded shaped copper, aluminium or aluminium alloy conductors shall have

a nominal cross-sectional area of not less than 25 mm2.

Flexible conductors (classes 5 and 6)

shall consist of plain or metal-coated annealed copper.The wires in each conductor shall have the same nominal diameter.

Table 1 – Class 1 solid conductors for single-core and multicore cables

Nominal cross-sectional area

mm2

Maximum resistance of conductor at 20 °C

Circular, annealed copper conductors

Aluminium and aluminium alloy conductors, circular or shaped c

Ω/km

Plain

Ω/km

Metal-Coated

Ω/km

0,5

0,75

1,0

1,5

2,5

120

150

185

240

300

400

500

630

800

1 000

1 200

36,0

24,5

18,1

12,1

7,41

4,61

3,08

1,83

1,15

0,727 b

0,524 b

0,387 b

0,268 b

0,193 b

0,153 b

0,124 b

0,101 b

0,0775 b

0,0620 b

0,0465 b

36,7

24,8

18,2

12,2

7,56

4,70

3,11

1,84

1,16

- 3,08 a

1,91 a

1,20 a

0,868 a

0,641

0,443

0,320 d

0,253 d

0,206 d

0,164 d

0,125 d

0,100 d

0,0778

0,0605

0,0469

0,0367

0,0291

0,0247

a Aluminium conductors 10 mm2 to 35 mm2 circular only; see 5.1.1 c).

b See note to 5.1.1 b).

c See note to 5.1.2.

d For single core cables, four sectoral 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.

Table 2 – Class 2 stranded conductors for single-core and multi-core cables

1	2	3	4	5	6	7	8	9	10
Nominal cross- sectional area mm2	Minimum number of wires in the conductor						Maximum resistance of conductor at 20°C
	Circular		Circular compacted		Shaped		Annealed copper conductor		Aluminium or aluminium alloy conductorc Ω/km
	Cu	Al	Cu	Al	Cu	Al	Plain wires Ω/km	Metal-coated wires Ω/km	Aluminium or aluminium alloy conductorc 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	0,0762	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	61	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
1 000	91	91	53	53	-	-	0,0176	0,0177	0,0291
1 200	b						0,0151	0,0151	0,0247
1 400 a	b						0,0129	0,0129	0,0212
1 600	b						0,0113	0,0113	0,0186
1 800 a	b						0,0101	0,0101	0,0165
2 000	b						0,0090	0,0090	0,0149
2 500	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 aluminium alloy conductors having the same nominal cross-sectional area as an aluminium conductor the resistance value should be agreed between the manufacturer and the purchaser.

Table 3 – Class 5 flexible copper conductors for single core and multi-core cables

1	2	3	4
Nominal cross-sectional area mm2	Maximum diameter of wires in conductor mm	Maximum resistance of conductor at 20 °C
Nominal cross-sectional area mm2	Maximum diameter of wires in conductor mm	Plain wires Ω/km	Metal-coated wires Ω/km
0,5	0,21	39,0	40,1
0,75	0,21	26,0	26,7
1,0	0,21	19,5	20,0
1,5	0,26	13,3	13,7
2,5	0,26	7,98	8,21
4	0,31	4,95	5,09
6	0,31	3,30	3,39
10	0,41	1,91	1,95
16	0,41	1,21	1,24
25	0,41	0,780	0,795
35	0,41	0,554	0,565
50	0,41	0,386	0,393
70	0,51	0,272	0,277
95	0,51	0,206	0,210
120	0,51	0,161	0,164
150	0,51	0,129	0,132
185	0,51	0,106	0,108
240	0,51	0,0801	0,0817
300	0,51	0,0641	0,0654
400	0,51	0,0486	0,0495
500	0,61	0,0384	0,0391
630	0,61	0,0287	0,0292

Table 4 – Class 6 flexible copper conductors for single-core and multi-core cables

1	2	3	4
Nominal cross-sectional area mm2	Maximum diameter of wires in conductor mm	Maximum resistance of conductor at 20 °C
Nominal cross-sectional area mm2	Maximum diameter of wires in conductor mm	Plain wires Ω/km	Metal-coated wires Ω/km
0,5	0,16	39,0	40,1
0,75	0,16	26,0	26,7
1,0	0,16	19,5	20,0
1,5	0,16	13,3	13,7
2,5	0,16	7,98	8,21
4	0,16	4,95	5,09
6	0,21	3,30	3,39
10	0,21	1,91	1,95
16	0,21	1,21	1,24
25	0,21	0,780	0,795
35	0,21	0,554	0,565
50	0,31	0,386	0,393
70	0,31	0,272	0,277
95	0,31	0,206	0,210
120	0,31	0,161	0,164
150	0,31	0,129	0,132
185	0,41	0,106	0,108
240	0,41	0,0801	0,0817
300	0,41	0,0641	0,0654

Table A.1 – Temperature correction factors kt for conductor resistance to correct the measured resistance at t °C to 20 °C

1	2	1	2
Temperature of conductor at time of measurement t °C	Correction factor, kt All conductors	Temperature of conductor at time of measurement t °C	Correction factor, kt All conductors
0	1,087	21	0,996
1	1,082	22	0,992
2	1,078	23	0,988
3	1,073	24	0,984
4	1,068	25	0,980
5	1,064	26	0,977
6	1,059	27	0,973
7	1,055	28	0,969
8	1,050	29	0,965
9	1,046	30	0,962
10	1,042	31	0,958
11	1,037	32	0,954
12	1,033	33	0,951
13	1,029	34	0,947
14	1,025	35	0,943
15	1,020	36	0,940
16	1,016	37	0,936
17	1,012	38	0,933
18	1,008	39	0,929
19	1,004	40	0,926
20	1,000
NOTE The values of correction factors kt are based on a resistance-temperature coefficient of 0,004 per K at 20 °C. The values of temperature correction factors specified in column 2 are approximate but give practical values well within the accuracy that can normally be achieved in the measurements of conductor temperature and length of cables or flexible cords. For more accurate values for the temperature correction factors for copper and aluminium, reference should be made to Annex B. However, these should not be treated as a requirement for testing in compliance with this standard in the assessment of resistances.

Table C.1 – Maximum diameters of circular copper conductors – solid, non-compacted stranded and flexible

1	2	3	4
Cross sectional area mm2	Conductors in cables for fixed installations		Flexible conductors (Classes 5 and 6) mm
Cross sectional area mm2	Solid (Class 1) mm	Stranded (Class 2) mm	Flexible conductors (Classes 5 and 6) mm
0,5	0,9	1,1	1,1
0,75	1,0	1,2	1,3
1,0	1,2	1,4	1,5
1,5	1,5	1,7	1,8
2,5	1,9	2,2	2,4
4	2,4	2,7	3,0
6	2,9	3,3	3,9
10	3,7	4,2	5,1
16	4,6	5,3	6,3
25 a	5,7	6,6	7,8
35 a	6,7	7,9	9,2
50 a	7,8	9,1	11,0
70 a	9,4	11,0	13,1
95 a	11,0	12,9	15,1
120 a	12,4	14,5	17,0
150 a	13,8	16,2	19,0
185	15,4	18,0	21,0
240	17,6	20,6	24,0
300	19,8	23,1	27,0
400	22,2	26,1	31,0
500	-	29,2	35,0
630	-	33,2	39,0
800	-	37,6	-
1 000	-	42,2	-
NOTE The values given for flexible conductors are intended to allow for both class 5 and class 6 conductors.
a See 5.1.1 b).

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