Earth loop impedance is the total resistance between the current source and earth when clearing a faulty current to earth. The earth loop impedance determines the maximum potential between the point at which the fault occurs and earth. The software performs earth loop impedance per cable and calculates the total impedance as the sum of the grounding path impedance, external loop impedance, and impedance of the cable carrying the current. According to the user's requirement, the grounding path can be through the cable armor, or through a separate grounding cable.
You can find this information in the Cable Algorithms.xlsm file:
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In the Attachments tab of the Sidebar of the Electrical On-Line help
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In the Smart Electrical program folder; \Program Files (x86)\SmartPlant\Electrical\bin\resdlls\0009\
In the file, maximize the window and select the EARTH LOOP IMPEDANCE tab.