Short circuit compliance on high Zs readings

[cliffed]

Would you divide the 5.13 ohms by 4.
I personally don’t think so.
Also the R1 /Rn short circuit resistances are different from the usual R1 /R2 measurements.
Found those in an electrical book by,that man.
The Zs on this circuit was above the permitted figure,so just had a play around to see if this complies,anyone agree.

 

[Abacus614]

My friend is this a real life scenario?

 

[Ian1981]

t=K2S2/I2 is the formula to use.
Nothing to do with a high earth fault loop impedance as the line to neutral loop measured loop could be significantly lower.

t being the maximum time in seconds allowed before damage to the live conductors and surrounding insulation occurs.
so does your short circuit fault current disconnect before damage to the live conductors only occur?