Figure below indicates a typical LV circuit with a phase to neutral voltage of 240V. PE is the protective earthing bus of the facility where the load is located and the metallic enclosure of the load is connected to PE with negligible resistance. Values of earth electrode resistances R1 and R2 are 4 ohm and 11 ohms respectively. All other imp solutionspile.com

Question

Figure below indicates a typical LV circuit with a phase to neutral voltage of 240V.

PE is the protective earthing bus of the facility where the load is located and the metallic enclosure of the load is connected to PE with negligible resistance.
Values of earth electrode resistances R1 and R2 are 4 ohm and 11 ohms respectively.
All other impedances are negligible.

What is the fault current that will flow due to insulation failure between the terminal L and the metallic enclosure of the load?
Calculate the Earth Potential Rise (EPR) when there is an insulation failure as shown in the figure.

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