weird question from an exam

[BoltsAndVolts]

trying to learn more put me on a path where i startet to think outside the box and outside us and found a uk book with an exam and there's a weird question that i cannot answer. maybe us and uk power grids work differently, i dont know but i hope someone can answer this for me

what characteristic of a public power supply value can only be determined by inquiry?

- nominal voltage
- maximum demand
- prospective fault current
- earth fault loop impedance

the question and the answer make no sense to me so i hope someone can shed some light on this

 

[black.mamba]

trying to learn more put me on a path where i startet to think outside the box and outside us and found a uk book with an exam and there's a weird question that i cannot answer. maybe us and uk power grids work differently, i dont know but i hope someone can answer this for me

what characteristic of a public power supply value can only be determined by inquiry?

- nominal voltage
- maximum demand
- prospective fault current
- earth fault loop impedance

the question and the answer make no sense to me so i hope someone can shed some light on this

Not too sure, but I'd guess it's either fault current or loop impedance since those can change depending on the location, maybe someone who knows UK power systems can confirm?

 

[FlipFlopDude]

I'm sure the answer is external earth loop impedance or Ze