Resistivity Values of Earthing Medium (2-5), (2-6), (2-7)
Surface soils, loam, etc.
Sand and gravel
Granites, basalts, etc.
Fresh Water Lakes
Pastoral, low hills, rich soil, typical
of Dallas, Texas; Lincoln, Nebraska
Flat country, marshy, densely wooded
typical of Louisiana near Mississippi
Pastoral, medium hills and forestation,
typical of Maryland, Pennsylvania, New
York, exclusive of mountainous territory
Rocky soil, steep hills, typical of New
Sandy, dry, flat, typical of coastal
City, industrial areas