Level 3 Design Project - How to calculate Zs?

So I’m doing my level 3 design project at the moment, and I’m on the question where you do all the calculations on each circuit, I’ve taken the max earth impedance from the regs, but it’s asking me for the earth fault loop impedance of the circuit.

I think it’s asking me to calculate it, and I know the formula is Zs = Ze + R1 + R2 but I can only get the values for R1 + R2.

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