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 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