Copper stranded conductor -BS 7884 standard

Solid or concentrically stranded bare copper. Copper is classified into three types: hard, moderately hard, and soft.

This conductor is also manufactured in accordance with BS7884, ASTM B8, NF C34-110, IEC 61089, DIN 48201-1, and other specifications.

Features

Hot-dip zinc coating that is uniform and firm.
A bright, clean surface.
Extremely high corrosion resistance.

Application

In overhead transmission and distribution applications, solid stranded bare copper is used. The more elastic stranded conductors are appropriate for grounding, jumpers, and uninsulated connections in electrical construction.

Construction

Copper wire, solid or stranded. Temperaments are available in hard, medium-hard, and soft. Multi-strand conductors are stranded concentrically in the hard and medium hard states, while combined single-strand stranding is used in the soft tensioned state.

Performance

Physical, mechanical and electrical properties of solid, circular, hard drawn copper wire

Nominal area of cross-setion mm2	Wire diameter Nominal mm	Wire diameter Max. mm	Wire diameter Min. mm	Nominal mass per unit length kg/km	Resitance at20°C Ω/km	Resitance at 20°C Ω/km	Minimum breaking load N
1.43	1.35	1.364	1.337	12.73	12.41	12.66	583
2.01	1.60	1.616	1.584	17.87	8.838	9.018	818
2.27	1.70	1.717	1.683	20.18	7.829	7.988	923
2.54	1.80	1.818	1.782	22.62	6.983	7.125	1035
3.46	2.10	2.121	2.079	30.79	5.130	5.235	1409
3.98	2.25	2.273	2.228	35.35	4.469	4.558	1618
4.75	2.46	2.484	2.435	42.25	3.739	3.816	1932
4.91	2.50	2.525	2.475	43.64	3.620	3.694	1997
5.51	2.65	2.677	2.624	49.03	3.222	3.286	2244
6.16	2.80	2.828	2.772	54.74	2.886	2.944	2505
6.61	2.90	2.929	2.871	58.72	2.600	2.745	2687
7.07	3.00	3.030	2.970	62.84	2.514	2.565	2875
8.04	3.20	3.232	3.168	71.50	2.210	2.254	3271
9.90	3.55	3.586	3.515	87.99	1.795	1.881	4027
11.04	3.75	3.788	3.713	98.19	1.609	1.641	4494
14.52	4.30	4.350	4.250	129.1	1.224	1.253	5675

NOET 1. Resistance values are calculated from a resistivity of 0.01777μΩm at 200 C. This is equivalent to a conductivity of 97% IACS.Maximum values of resistance are calculated from minimum diameters.
NOTE 2. Minimum breaking loads for nominal diameters up to and including 4 mm are based on the minimum diameter of conductor and a tensile strengh of 415 N/mm2 and for nominal diameters greater than 4 mm they are based on the mimimm diameter of conductor and a tensile strength of 400 N/mm2.
NOTE 3. Nominal mass per unit length has been calculated using a density of 8890 kg/m3.

Physical, mechanical and electrical properties of solid, circular, hard drawn copper alloy wire

Nominal area of crosss-section	Wire diameter Nominal	Wire diameter Max.	Wire diameter Min.	Nominal mass per unit length	Resistance at 20°C	Resistance at 20°C	Minimum breaking load
mm2	mm	mm	mm	kg/km	Ω/km	Ω/km	N
2.27	1.7	1.717	1.683	20.30	9.494	9.687	1379
2.54	1.80	1.818	1.782	22.76	8.469	8.641	1546
3.14	2.00	2.020	1.980	28.10	6.860	6.999	1909
3.46	2.10	.2.121	2.079	30.98	6.222	6.348	2105
3.98	2.25	2.273	2.228	35.57	5.420	5.527	2417
4.15	2.30	2.323	2.277	37.16	5.187	5.292	2525
4.91	2.50	2.525	2.475	43.91	4.390	4.479	2983
5.31	2.60	2.626	2.574	47.49	4.059	4.141	3226
6.16	2.80	2.828	2.772	55. 08	3.500	3.571	3561
6.61	2.90	2.929	2.871	59.08	3.263	3.329	3820
8.04	3.20	3.232	3.168	71.94	2.680	2.734	4651
9.62	3.50	3.535	3.465	86.06	2.240	2.285	5564
10.75	3.70	3.737	3.663	96.18	2.004	2.045	5901
12.57	4.00	4.040	3.960	112.4	1.715	1.750	6897
14.52	4.30	4.350	4.250	129.9	1.484	1.519	7944

Note 1.Resistance values are calculated from a resistivity of 0.021 55 μΩm at 20C .This is equivalent to a conductivity of 80 % IASC. Maximum values of resistance are calculated from minimum diameters.
NOTE 2. Nominal mass per unit length has been calculated using a density of 8945 kg/m3 and therefore the values apply only to copper-cadmium alloy C108.

Physical, mechanical and electrical properties of hard drawn copper stranded conductors

Nominal area of cross-section of stranded conductor mm2	Construction(stranding and wire diameter) number/mm	Overall diameter of conductor (approx.) mm	Nominal mass per unit length kg/km	Resistance at 20°C Nominal Ω/km	Resistance at 20°C Max Ω/km	Minimum breaking load N
10	7/1.35	4.05	89.82	1.788	1.829	3752
14	7/1.60	4.80	126.2	1.273	1.303	5267
16	3/2.65	5.70	148.3	1.082	1.106	6194
16	7/2.10	5.10	142.4	1.128	1.154	5946
25	7/2.10	6.30	217.3	0.7391	0.7563	9073
32	3/3.75	8.06	296.9	0.5405	0.5520	12400
32	7/2.46	7.38	298.2	0.5386	0.5497	12442
35	7/2.50	7.50	308.0	0.5215	0.5337	12860
50	7/3.00	9.00	443.5	0.3622	0.3706	18520
50	19/1.80	9.00	435.8	0.3727	0.3819	17700
70	7/3.55	10.65	621.1	0.2586	0.2646	25930
70	19/2.10	10.50	593.2	0.2738	0.2806	24090
95	19/2.50	12.50	840.7	0.1932	0.1980	34140
100	7/4.30	12. 90	911.2	0.1763	0.1810	36540
120	19/2.80	14.00	1055	0.1540	0.1578	42830
125	19/2 .90	14.50	1131	0.1436	0.1471	45940
150	19/3.20	16.00	1377	0.1180	0.1208	55940
150	37/2.25	15.75	1334	0.1233	0.1264	53880
185	19/3.55	17.75	1695	0.09582	0.09815	68860
185	37/2 .50	17.50	1647	0.09981	0.1024	66490

Note 1.Resistance values are calculated from a resistivity of 0.01777 μΩm.at 20°C .Nominal resistance is calculated from the nominal diameter and mean lay ratio.Maximum resistance is calculated from minimum diameter and minimum lay ratio.
NOTE 2. Minimum breaking load is based on the sum of minimum breaking loads of component wires shown in table 2, multiplied by a factor of 0.92 for three and seven wire standards and 0.90 for nineteen and thirty-seven wire strands.
NOTE 3. Nominal mass per unit length has been calculted using a density of 8800 kg/m3

Physical, mechanical and electrical properties of hard drawn copper alloy stranded conductors

Nominal area of cross-section of stranded conductor mm2	Construction (stranding and wire diameter) number/mm	Overall diameter of conductor (approx.)	Nominal mass per unit length kg/km	Resistance at 20°C Nominal Ω/km	Resistance at 20°C Max Ω/km	Minimum breaking load N
12	3/2.30	4.95	112.4	1.743	1.780	6968
16	7/1.70	5.10	143.3	1.368	1.399	8883
22	7/2.00	6.00	198.3	0.9882	1.011	12290
25	7/2.10	6.30	218.7	0.8959	0.9171	13550
30	7/2.30	6.90	262.3	0.7469	0.7645	16260
35	7/2.50	7.50	309.9	0.6324	0.6471	19210
38	7/2.60	7.80	335,2	0.5847	0.5983	20780
45	7/2.90	8.70	417.0	0.4698	0.4809	24600
55	7/3.20	9.60	507.8	0.3859	0.3950	29950
70	19/2.10	10.50	596.8	0.3316	0.3403	35990
75	7/3.70	11.10	678.8	0.2887	0.2954	38010
95	19/2 .50	12.50	845.9	0.2343	0.2400	51010
100	7/4.30	12.90	916.9	0.2138	0.2195	51160
120	19/2.80	14.00	1061	0.1862	0.1914	60890
125	19/2. 90	14.50	1138	0.1739	0.1784	65310
150	19/3.20	16.00	1386	0.1428	0.1465	79530
150	37/2.25	15.75	1342	0.1493	0.1533	80490
180	19/3.50	17.50	1658	0.1196	0.1225	95140
180	37/2.50	17.50	1657	0.1209	0.1242	99330
200	19/3.70	18.50	1853	0.1068	0.1696	100900
240	19/4. 00	20.00	2165	0.09153	0.09378	117900

Note 1. Resistance values are calculated from a resistivity of 0.02155 μΩm at 20°C .Nominal resistance is calculated from the nominal diameter and mean lay ratio.Maximum resistance is calculated from minimum diameter and minimum lay ratio.
NOTE 2. Minimum breaking load is based on the sum of minimum breaking loads of component wires shown in table 3, multiplied by a factor of 0.92 for there and seven wire standards and 0.90 for nineteen and thirty-seven wire strands.
NOTE 3. Nominal mass per unit length has been calculted using a density of 8945 kg/m3 and therefore the values appy only to copper-cadmium alloy C108.

Lay ratios of stranded conductors

Number of wires in conductor	lay ratio 3 wire layer Min.	lay ratio 3 wire layer Max.	lay ratio 6 wire layer Min.	lay ratio 6 wire layer Max.	lay ratio 12 wire layer Min.	lay ratio 12 wire layer Max.	lay ratio 18 wire layer Min.	lay ratio 18 wire layer Max.
3	11	16	-	-	-	-	-	-
7	-	-	13	17	-	-	-	-
19	-	-	13	17	12	15	-	-
37	-	-	13	17	12	15	10.5	13