Answer Posted / ahmad abu alrob

Normally no meaning for earth resistance, we use a
measurement of resistance in a definite location to
calculate the Earth Resistivity which can be used for the
calculation of Grounding/ Earthing mesh resistance.

Measurement can be done in one of the following:

1- Normal Volt/ Ampere method: Inject current and measure
voltage , then you will got the resistance.

OR

2- Wenner method using 4 electrodes: You should use the
equipment especially used for this purpose, and you should
follow the instruction attached with the equipment.

OR

3- Using Schlumberger method applying 4 electrodes: same
equipment used in 2 but different calculation applied.

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