few questions

[andy]

how do you get the Ze @ origin? and is the short circuit capacity the Ze X voltage?

also, what is R1, R2 and Zs?

 

[ryanj]

how do you get the Ze @ origin?

The term Ze specifically means the earth fault loop impedance at the origin of the installation, so no need for the "@ origin".

For that you would simply use a Earth-fault loop impedance tester.

and is the short circuit capacity the Ze X voltage?

Do you mean "prospective short-circuit current"? If you do, then it isn't. No relation at all. You need a prospective short-circuit tester.

also, what is R1, R2 and Zs?

R1 and R2 are used for testing ring circuits.

Zs is the earth-fault loop imediance at an accessory.

 

[ban-all-sheds]

also, what is R1, R2 and Zs?

R1 & R2 are the resistances of the phase and protective conductors respectively.

Therefore Zs = Ze + R1 + R2.