Prospective fault current

[davino]

can somone tell me how to mesure pfc for a domestic property need this asap!!!!!
thanks in advance

 

[Mike P]

Disconect Main Earth. Put meter across Earth incoming (met) Connect other leads to Phase conductors do test. Then connect Earth and Neutral test leads together and connect to neutral phase conductor, connect the other lead to Line Phase conductor.
Test again. Wich ever is the highest reading in Ka record that on the test results.
Don't forget to re connect the main Met.
All these tests done with power on cons unit OFF

 

[frank12]

You could also buy Guidance Notes 3 it will help you with all aspects of Testing & Inspecting

 

[davino]

Disconect Main Earth. Put meter across Earth incoming (met) Connect other leads to Phase conductors do test. Then connect Earth and Neutral test leads together and connect to neutral phase conductor, connect the other lead to Line Phase conductor.
Test again. Wich ever is the highest reading in Ka record that on the test results.
Don't forget to re connect the main Met.
All these tests done with power on cons unit OFF

under what function do i set the tester?? i have a metrel 2100 easytest...thanks

You could also buy Guidance Notes 3 it will help you with all aspects of Testing & Inspecting

thank frank i think i will!!

 

[Mike P]

Sorry not familiar with that test set. I use Fluke 1653. But when I had Robin test kit
if I remember correctly it was the loop meter that was used for Ze and Prospective fault current. I'm sure if that's wrong a user of Robin kit will correct me

 

[davino]

is there any illlustrations avaiable on the web that i could look at to help me ?

 

[WarrenG]

Davino, PM me with your email, I have some good illustrations for you.

 

[laney06]

take a Ze reading.

230v divided by your Ze reading. then divide this answer by 1000.

Thats your fault current.

Ohms law.

 

[davino]

take a Ze reading.

230v divided by your Ze reading. then divide this answer by 1000.

Thats your fault current.

Ohms law.

Yeah, got it laney , nice 1

 

[city spark]

set your earth fault loop impedance tester to 20KA and dependent on whether you have a 2 lead or 3 lead tester you connect (3lead) green and black to neutral and red to live this is your potential short circuit current (pssc) then connect green and black to earth and red to live this is your prospective earth fault current (pefc)or (pfc) it states that you must determine the pefc and pssc at every relevant point in the installation this can be done by calculation as laney06 describes or measurement or enquiry hope that helps you.

 

[12345aob]

Disconect Main Earth. Put meter across Earth incoming (met) Connect other leads to Phase conductors do test. Then connect Earth and Neutral test leads together and connect to neutral phase conductor, connect the other lead to Line Phase conductor.
Test again. Wich ever is the highest reading in Ka record that on the test results.
Don't forget to re connect the main Met.
All these tests done with power on cons unit OFF

Why do you need to Disconect Main Earth for the pefc test?

 

[LukeScotty]

am guessing parallel paths???

 

[uksel]

Ohms law applies to DC supply & not AC

although the ballpark figure won't be far off, it still isn't entirely accurate

 

[jimes]

ohms law is ohms law ac or dc and also rf

 

[jeremy]

Ohms law applies to DC supply & not AC

although the ballpark figure won't be far off, it still isn't entirely accurate

I dont understand. surely V=IR