Copper Clad Steel (40%) Conductor Wire

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Copper Clad Steel (CCS) is a composite conductor material containing a low carbon steel core surrounded by copper. The copper provides the electrical conductivity and the steel contributes strength to the conductor. The most common grade of CCS used for electrical conductors has a nominal s40% IACS electrical conductivity. CCS is suitable for applications where high strength and medium conductivity are required. Copper Clad Steel is also suited for high frequency signal applications since high frequency currents travel mainly in the outer skin of a conductor.

CCS is available bare or plated with silver, nickel or tin.

Physical Properties

  Hard Drawn Soft
Tensile 758 MPa 310 MPa
Elongation 1% 10%
Electrical Conductivity 0.226 megmho/cm @ 20°C 0.226 megmho/cm @ 20°C
Electrical Resistivity 4.397 microhm-cm @ 20°C 4.397 microhm-cm @ 20°C
Melting Point --- ---
Density 8.14 g/cm³ 8.14 g/cm³
Thermal Coefficient of Resistance 0.00378 Per °C 0.00378 Per °C

19-Strand Concentric Constructions

Bare CCS (40%) - Hard Temper
AWG  Const  Diameter (mm) Resist
(Ω/km)
Weight
(kg/km)
Break StrG
(N)
Min Max Max Max Min
18 19/30 1.257 1.283 47.6 8.14 716
20 19/32 1.003 1.029 74.5 5.22 455
22 19/34 0.787 0.813 121.4 3.27 281
24 19/36 0.622 0.648 192.9 2.07 175
26 19/38 0.495 0.521 304.8 1.34 111
28 19/40 0.381 0.406 515.4 0.816 65.8
Bare CCS (40%) - Soft Temper
AWG  Const  Diameter (mm) Resist
(Ω/km)
Weight
(kg/km)
Break StrG
(N)
Min Max Max Max Min
18 19/30 1.257 1.283 47.6 8.14 293
20 19/32 1.003 1.029 74.5 5.22 186
22 19/34 0.787 0.813 121.4 3.27 115
24 19/36 0.622 0.648 192.9 2.07 71.6
26 19/38 0.495 0.521 304.8 1.34 45.4
28 19/40 0.381 0.406 515.4 0.816 26.9

7-Strand Constructions

Bare CCS (40%) - Hard Temper
AWG  Const  Diameter (mm) Resist
(Ω/km)
Weight
(kg/km)
Break StrG
(N)
Min Max Max Max Min
22 7/30 0.754 0.770 128.3 2.99 263
24 7/32 0.602 0.617 200.5 1.90 168
26 7/34 0.472 0.488 325.8 1.20 103
28 7/36 0.373 0.389 521.6 0.759 64.5
30 7/38 0.297 0.312 820.5 0.488 40.9
32 7/40 0.229 0.244 1,391.4 0.299 24.2
BARE CCS (40%) - SOFT TEMPER
AWG  Const  Diameter (mm) Resist
(Ω/km)
Weight
(kg/km)
Break StrG
(N)
Min Max Max Max Min
22 7/30 0.754 0.770 128.3 2.99 108
24 7/32 0.602 0.617 200.5 1.90 68.5
26 7/34 0.472 0.488 325.8 1.20 42.3
28 7/36 0.373 0.389 521.6 0.759 26.4
30 7/38 0.297 0.312 820.5 0.488 16.7
32 7/40 0.229 0.244 1,391.4 0.299 9.92

Single End Constructions

Silver Plated CCS (40%) - Hard/Soft
AWG  STD
Plate
Diameter (mm) Resist
(Ω/km)
Weight
(kg/km)
Break StrG
Hard (N)
Break StrG
Soft (N)
Min Max Max Max Min Min
30 2 0.251 0.262 922.2 0.443 37.7 15.4
31 4 0.224 0.234 1,192 0.354 29.8 12.2
32 4 0.201 0.211 1,479 0.289 24.0 9.83
33 4 0.175 0.185 1,884 0.229 18.8 7.70
34 4 0.157 0.168 2,402 0.180 14.8 6.05
35 4 0.140 0.150 3,052 0.144 11.6 4.76
36 4 0.124 0.135 3,845 0.116 9.21 3.78
37 7 0.112 0.122 4,924 0.095 7.43 3.04
38 7 0.0991 0.1092 6,270 0.076 5.83 2.39
39 7 0.0864 0.0965 8,248 0.060 4.44 1.82
40 7 0.0762 0.0864 10,597 0.048 3.46 1.41
Silver Plated CCS (40%) 
AWG  STD
Plate
Diameter (mm) Resist
(Ω/km)
Weight
(kg/km)
Break StrG
Hard (N)
Break StrG
Soft (N)
Min Max Max Max Min Min
30 3 0.251 0.257 885.5 0.429 37.7 15.4
31 3 0.224 0.229 1,121 0.341 29.8 12.2
32 4 0.201 0.206 1,390 0.275 24.0 9.83
33 4 0.178 0.183 1,771 0.219 18.8 7.70
34 4 0.157 0.163 2,258 0.173 14.8 6.05
35 5 0.140 0.145 2,869 0.137 11.6 4.76
36 5 0.124 0.130 3,615 0.110 9.21 3.78
37 6.1 0.112 0.117 4,482 0.0896 7.43 3.04
38 6.1 0.0991 0.1041 5,705 0.0713 5.83 2.39
39 8 0.0864 0.0914 7,506 0.0551 4.44 1.82
40 8 0.0762 0.0813 9,642 0.0436 3.46 1.41