please help with this question

[paulthemagpie]

hi guys,

i need some help with an assignment and id appreciate it so so much if anyone can help me.

A circut which is supplied from DB 3 is protected by a 16A type C circut breaker and has a measured earth fault loop impednace of 1.35 ohms. Please determine (with reasons were applicable)

a. if this value of earth fault loop impendance is acceptable
b. at least one method of achieving disconnection should the device provide unacceptable in (a.) above with out re-wiring the circut.
c. at least one method of confirming the integrity of the live conductors of that circut under short circut conditions.

thanks alot guys for any help

 

[JuniorSparky]

Mine is 2357, but I guess there are some common exams/tasks in the different courses.

 

[sirsparksalot]

equations

I think i would be tempted to try Ze + r1+r2 compensated just to see if i could get a better result as its so close.

the equation you need is the adiabatic equation which is K2 x S2 / I2 hope that helps