I indicated that the Earthing Systems Design Steps process has (3) main steps:
Earthing Systems Design
Steps

And I explained the first step: Data Collection in the following Articles:
I explained the second step: Data Analysis in the following Articles:
And I explained What we are going to design for grounding system in any building in the following Articles:
And, in Article " Grounding Design Calculations – Part One ", I indicated the following:
Grounding System Design
Calculations according to type of the building
The procedures for performing the Grounding System Design
Calculations can differ slightly according to the type of the building
as follows:

First: Domestic,
commercial and industrial premises
We mean by domestic, commercial and
industrial premises, all installations up to 1,000 V ac and 1,500 V dc 
between phases, with some minor exceptions.

Methods of Grounding Design
Calculations
There are many methods can be used for
performing Grounding System Design Calculations But the common methods
are:

In this Article and Article " Grounding Design Calculations – Part Two ", I explained the first method of grounding design calculations: Equations Method and solved examples.
And I explained the second method of grounding design calculations: Nomographs Method in Article " Grounding Design Calculations – Part Three".
Also, I explained the third method of grounding design calculations: Excel Spreadsheets Method in Article " Grounding Design Calculations – Part Four ".
And I explained the forth method of grounding design calculations: By using Tables In Articles " Grounding Design Calculations – Part Five " and " Grounding Design Calculations – Part Six ".
Also, I explained the fifth method of grounding design calculations: By using Online Earthing Calculators in Articles " Grounding Design Calculations – Part Seven " and " Grounding Design Calculations – Part Eight ".
Today, I will explain the Sixth Method of Grounding Design Calculations: Software Programs Method.
You can preview the following Articles for more info:
Sixth Method: Software
Programs Method
Actually, there are many software programs for Grounding Design Calculations as:
But Unfortunately, most of these programs are not for free, you can download a demo with free trial period or less functions/capabilities. The only free software program for Grounding Design Calculations is EricoGem and because of this, it will be explained in this article.

Erico – GEM Calculator

1 Benefits from using this program

2 Basis of Calculation
Notes:

3 Program Interfaces
The programs include group of interfaces or windows as follows:

3.1 Language interface
In this interface, we need to Select the Language to proceed and The
available languages are:

GEM Calculator Interface
The GEM Calculator includes the following buttons:

General Notes For All Buttons
In GEM Calculator Interface
2Effect of Moisture Content on Resistivity: copied from table 11 of IEEE std 142 1991,
3 Effect of temperature on Resistivity: copied from table 12 of IEEE std 142 1991,
4 Cable Diameter Equivalents: give the equivalent diameter in inches and cm for a given cable cross section area in Kcmil, AWG and mm2.

Calculation#1: for Single
Ground Rod (without GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms).

Calculation#2: for Single
Ground Rod (with GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms)
and the required number of GEM Bags.

Calculation#3: for Multiple
Ground Rods in a Line (without GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms).

Calculation#4: for Multiple
Ground Rods in a Line (with GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms)
and the required number of GEM Bags.
Note:

Calculation#5: for Bare Ground
Wire in a Line (without GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms).

Calculation#6: for Bare Ground
Wire in a Line (with GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms)
and the required number of GEM Bags.

Calculation#7: Bare Ground Wire
in a Ring (without GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms).

Calculation#8: Bare Ground Wire
in a Ring (with GEM)
Step#1: Enter the following data:
Step#2: Press the calculate button.
Step#3: Results step: you will get the electrode resistance in (ohms)
and the required number of GEM Bags.

About GEM

You can download your copy from ERICOGEM Program by click on the link

In the next Article, I will explain Methods of Grounding Design Calculations for High and medium voltage electricity substations. Please, keep following.
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