Copper Clad Steel (40%)

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 40% 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 110 ksi 45 ksi Elongation 1% 10% Electrical Conductivity 39% IACS* @ 68°F 39% IACS* @ 68°F Electrical Resistivity 26.45 cir mil ohm/ft @ 68°F 26.45 cir mil ohm/ft @ 68°F Melting Point --- --- Density 0.294 lbs/in³ 0.294 lbs/in³ Thermal Coefficient of Resistance 0.00210 Per °F 0.00210 Per °F

19-Strand Concentric Constructions

Bare CCS (40%) - Hard Temper AWG  Const  Diameter 

(inch)

Resist

(Ω/mft)

Weight

(lb/mft)

Break STRG

(lb)

Min Max Max Max Min 18 19/30 0.0495 0.0505 14.5 5.47 160.9 20 19/32 0.0395 0.0405 22.7 3.51 102.4 22 19/34 0.0310 0.0320 37.0 2.20 63.1 24 19/36 0.0245 0.0255 58.8 1.39 39.4 26 19/38 0.0195 0.0205 92.9 0.899 25.0 28 19/40 0.0150 0.0160 157.1 0.548 14.8 Bare CCS (40%) - Soft Temper AWG Const Diameter

(inch)

Resist

(Ω/mft)

Weight

(lb/mft)

Break StrG

(lb)

Min Max Max Max Min 18 19/30 0.0495 0.0505 14.5 5.47 65.8 20 19/32 0.0395 0.0405 22.7 3.51 41.9 22 19/34 0.0310 0.0320 37.0 2.20 25.8 24 19/36 0.0245 0.0255 58.8 1.39 16.1 26 19/38 0.0195 0.0205 92.9 0.899 10.2 28 19/40 0.0150 0.0160 157.1 0.548 6.04

7-Strand Constructions

Bare CCS (40%) - Hard Temper AWG  Const  Diameter

(inch)

Resist

(Ω/mft)

Weight

(lb/mft)

Break StrG

(lb)

Min Max Max Max Min 22 7/30 0.0297 0.0303 39.1 2.01 59.2 24 7/32 0.0237 0.0243 61.1 1.28 37.7 26 7/34 0.0186 0.0192 99.3 0.803 23.2 28 7/36 0.0147 0.0153 159.0 0.510 14.5 30 7/38 0.0117 0.0123 250.1 0.328 9.20 32 7/40 0.0090 0.0096 424.1 0.201 5.44 BARE CCS (40%) - SOFT TEMPER AWG Const Diameter

(inch)

Resist

(Ω/mft)

Weight

(lb/mft)

Break StrG

(lb)

Min Max Max Max Min 22 7/30 0.0297 0.0303 39.1 2.01 24.2 24 7/32 0.0237 0.0243 61.1 1.28 15.4 26 7/34 0.0186 0.0192 99.3 0.803 9.50 28 7/36 0.0147 0.0153 159.0 0.510 5.94 30 7/38 0.0117 0.0123 250.1 0.328 3.76 32 7/40 0.0090 0.0096 424.1 0.201 2.23

Single End Constructions

NICKel Plated CCS (40%) - Hard/Soft AWG STD
Plate
% Diameter

(inch)

Resist

(Ω/mft)

Weight

(lb/mft)

Break StrG
Hard

(lb)

Break StrG 
Soft 

(lb)

Nom Min Max Max Max Min Min 30 2 0.0101 0.0099 0.0103 281.1 0.298 8.47 3.46 31 4 0.0090 0.0088 0.0092 363.4 0.238 6.69 2.74 32 4 0.0081 0.0079 0.0083 450.9 0.194 5.39 2.21 33 4 0.0071 0.0069 0.0073 574.2 0.154 4.23 1.73 34 4 0.0064 0.0062 0.0066 732.0 0.121 3.32 1.36 35 4 0.0057 0.0055 0.0059 930.2 0.0966 2.61 1.07 36 4 0.0051 0.0049 0.0053 1,172 0.0779 2.07 0.849 37 7 0.0046 0.0044 0.0048 1,501 0.0639 1.67 0.684 38 7 0.0041 0.0039 0.0043 1,911 0.0513 1.31 0.538 39 7 0.0036 0.0034 0.0038 2,514 0.0401 0.999 0.409 40 7 0.0032 0.0030 0.0034 3,230 0.0321 0.778 0.318 Silver Plated CCS (40%) AWG STD
Plate
% Diameter

(inch)

Resist

(Ω/mft)

Weight

(lb/mft)

Break StrG
Hard

(lb)

Break StrG 
Soft 

(lb)

Nom Min Max Max Max Min Min 30 3 0.0100 0.0099 0.0101 269.9 0.288 8.47 3.46 31 3 0.0089 0.0088 0.0090 341.6 0.229 6.69 2.74 32 4 0.0080 0.0079 0.0081 423.8 0.185 5.39 2.21 33 4 0.0071 0.0070 0.0072 539.8 0.147 4.23 1.73 34 4 0.0063 0.0062 0.0064 688.1 0.116 3.32 1.36 35 5 0.0056 0.0055 0.0057 874.4 0.0921 2.61 1.07 36 5 0.0050 0.0049 0.0051 1,102 0.0739 2.07 0.849 37 6.1 0.0045 0.0044 0.0046 1,366 0.0602 1.67 0.684 38 6.1 0.0040 0.0039 0.0041 1,739 0.0479 1.31 0.538 39 8 0.0035 0.0034 0.0036 2,288 0.0370 0.999 0.409 40 8 0.0031 0.0030 0.0032 2,939 0.0293 0.778 0.318

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

For a full size version of product specifications, including chemical composition in both US and Metric units, please download the PDF.