Item # 7#7, Copper Clad Steel Wire On ...

APPLICATIONS
Copper Clad steel wire and strand combines the electrical characteristics of copper with the mechanical properties of steel. Often used for buried ground grid systems, overhead ground wire and messenger wire, it can resist mechanical damage during installation, as well as electrical damage during a fault condition. Copper Clad steel has virtually no scrap value, and is extremely difficult to cut with traditional wire and cable cutting tools, greatly reducing the potential of theft.

CONSTRUCTION
Dead Soft Annealed (DSA) Copper Clad steel (CCS) conductors are a concentric lay-stranded construction. The CCS strands are a 40% conductivity grade of material using a low carbon steel core rendering greater flexibility to enable easier handling during installation.

STANDARDS

• ASTM B193 - Standard Test Method for Resistivity of Electrical Conductor Materials
• ASTM B227 - Standard Specification for Hard-Drawn Copperclad Steel Wire
• ASTM B228 - Standard Specification for Concentric-Lay-Stranded Copperclad Steel Conductors
• ASTM B258 - Standard Specification for Standard Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round
• ASTM B910 - Standard Specification for Annealed Copperclad Steel Wire

Copper Clad steel wire and strand combines the electrical characteristics of copper with the mechanical properties of steel. Often used for buried ground grid systems, overhead ground wire and messenger wire, it can resist mechanical damage during installation, as well as electrical damage during a fault condition. Copper Clad steel has virtually no scrap value, and is extremely difficult to cut with traditional wire and cable cutting tools, greatly reducing the potential of theft.Dead Soft Annealed (DSA) Copper Clad steel (CCS) conductors are a concentric lay-stranded construction. The CCS strands are a 40% conductivity grade of material using a low carbon steel core rendering greater flexibility to enable easier handling during installation.

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NOTES
Dimensions and weights are nominal values, subject to standard manufacturing tolerances. The ampacity rating and the DC and AC resistance of the Copper Clad steel wire conductor is not equivalent to that of a copper conductor.

To select the correct equivalent please see — Proper Product Sizing: Diameter Comparison for Copper Equivalent Fusing Current for Grounding Applications.


Updated 12/6/2021

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There are some people selling steel wire plated with copper for making wire antennas.

Perhaps the most well-known brand of this product, Copperweld, makes at least two kinds of copper-clad wire, copper-clad steel (CCS), and copper-clad aluminum (CCA). On Copperweld's applications page, they write:

CCA is a natural for antennas in a variety of applications such as large ground-based arrays or even ham radios or mobile phones. CCA is applicable to most localized RF transmitters and is being used near radio towers to shield other structures from creating interference.

(note: CCA, the A for aluminum)

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Wikipedia on copper-clad aluminum lists applications:

The primary applications of this conductor revolve around weight reduction requirements. These applications include high-quality coils, such as the voice coils in headphones, portable loudspeakers or mobile coils; high frequency coaxial applications; such as RF antennas; CATV distribution cables; and power cables.

The article on copper-clad steel lists nothing about RF applications:

Grounding, union of ground rods to metallic structures, meshes, substations, power installations and lightning arrestors.

To be fair, most of the amateur radio sites I've seen selling anything similar call it simply "copper-clad wire", and don't specify if the core is steel, aluminum, or gold.

It seems to be understood that steel is not a good antenna wire. So, is copper-clad steel a good antenna wire, or no? Why?

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