Grounding Functions

JMK Engineering Inc. Python Tools by: Jeff MacKinnon

email: jeff@jmkengineering.com

Grounding functions

jmktools.grounding.laurent(area, len_conductor, resistivity)

This function calculates the expected Rg of a grounding system using the Laurent Method, also known as the IEEE 80 Simplified method.

Rg_area = (soil_resistivity / (4 * sqrt(Area_of_grounding_system))

Rg_conductors = soil_resistivity / total_buried_conductor_length

Rg = Rg_area + Rg_conductors

jmktools.grounding.resistivity_wenner(spacing, resistance)

This function calculates the resistivity in ohm-m from the wenner resistance measurements.

The spacing must be in meters and the resistance in ohms.

jmktools.grounding.sverak(area, len_conductor, depth, resistivity)

This is IEEE 80, Equation 57 or Sverak method to calcuate the Rg.

It is:

Rg = soil_resistivity*[1/total_buried_conductor_length + {(1/sqrt(20*Area_of_grounding_system)) * (1 + 1/(1+buried_depth_grounding_system * sqrt(20 / Area_of_grounding_system)))}]

This function breaks the function into three parts to make it easier to read.