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Resistivity Of Copper And Steel In 20 ℃ Respectively Is 17.24 X 10-6 (Ω Mm) And 138 X 10-6 (Ω Mm). If The Conductivity Of The Copper Is 100%, The Conductivity Of The Standard 1020 Steel Is Only 10.8%, The Conductivity Of The Galvanized Steel Is Only 8.6%, So The Conductivity Of The Copper Is About 10 Times Of Steel. 

Pure Copper Ground Rod Is The Best Ground Rod, Can Use H90, H70, H68, A Variety Of Specifications H65 And H62 Brass To Make Ground Rod Body, Suitable For The Use Of Lightning Protection Conductive To Demand Higher Occasion.