How to model conductors surrounded by additional substance using SafeGrid
Model the effects of Bentonite, Marconite or equivalent enhancement materials surrounding buried earthing conductors.
To model the influence of an additional substance surrounding the conductors of a buried earthing system on grid resistance, touch and step voltages.
Treat the actual buried conductor and surrounding substance combined as a buried conductor of an equivalent (calculated) radius.
Approximate analytical equation
Model in SafeGrid under Design Settings
 Kurtovic, M. and Vujevic, S. “Earthing grid parameters with conductor surrounded by an additional substance.”, IEEE Transactions, 2000
Fundamentals of Earthing Design
This tutorial introduces key concepts used in the design of substation earthing/grounding systems. Important terminology is discussed including Grid Potential Rise, touch and step voltages and current distribution.