Hard-to-find original source documents for the American Substation Grounding Guide
1918 NBS no. 108 - Grounding Guide - Round Pipe and Flat Strips (pdf)
Download1945 Rudenberg - Grounding Math - Round Cables and Other Shapes (pdf)
Download1947 NSB and CDA - Copper Corrosion Rates in Different Soils (pdf)
Download1956 AIEE - Grounding of Industrial Power Systems ("FAIR USE") (pdf)
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