Calculation of electric shock current caused by touch and step voltage in grounding grids including climatic conditions

PRZEGLAD ELEKTROTECHNICZNY(2024)

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Abstract
Appropriately designed grounding should provide such a distribution of electrical potential on the ground surface to ensure the values of electric shock currents are at an acceptable level. The potential distribution depends on the design and size of the grounding system and the resistivity of the soil. The value of the electric shock current depends on the distribution of electrical potential on the ground surface determining the values of step and touch voltages and the impedance of the human body. The impedance value of the human body is affected by factors such as the condition of the epidermis, and the path of shock, but also environmental factors such as humidity and temperature. The article presents the results of calculations of human body impedance and electric shock current for different environmental conditions and different design variants of the grounding system, determining the values of step and touch voltages.
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Key words
electric shock current,step voltage,touch voltage,human body impedance,grounding grid
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