Vz. Annenkov, SPARKING ZONES AND SOIL BREAKDOWN WITH LIGHTNING CURRENT SPREADING OUT FROM A SOLID EARTHING CONDUCTOR, ELECTRICAL TECHNOLOGY, (3), 1995, pp. 53-67
Formulae for the fictitious sparking zone of an earthing rod are deriv
ed on the basis of an analysis of earth connection tests carried out b
y various authors and with account taken of the volt-ampere characteri
stics of different soils. Safe distances between earthing rods in vari
ous soils are evaluated. Results of calculations are in good agreement
with experimental data.