Prospective fault current ?

[martinh89]

Can somebody please clear up for me what is prospective fault current?

Am i right in thinking its the value of overcurrent you get through fault conditions like short circuits
and live conductors and exposed conductive parts ?

Thanks

 

[i=p/u]

negible impedance between live conductors, having a difference of potenital..

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pscc and pefc = pfc

 

[i=p/u]

you are right too...

 

[telectrix]

it's basically the current caused by shorting out L-N ( PSCC ) or L-E ( PEFC ). depends in the circuit impedance, the lower the impedance, the higher the current.

 

[martinh89]

it's basically the current caused by shorting out L-N ( PSCC ) or L-E ( PEFC ). depends in the circuit impedance, the lower the impedance, the higher the current.

Thanks telectrix also what does PEFC and PSCC ? Sorry if thats a stupid question

 

[telectrix]

prospective short circuit current and prospective earth fault current. you find that these are approx the same if the E conductor is the same size as the L. with T/E cable though the cpc is smaller, so the pscc is larger in value than the pefc. this is because the smaller cpc has a higher resistance ( approx. 1.66 x ) than the L and N conductors.

 

[trev]

There's a list of commonly used acronyms on here somewhere Martin, if you're going to be a regular visitor you'll need em mate.

 

[martinh89]

prospective short circuit current and prospective earth fault current. you find that these are approx the same if the E conductor is the same size as the L. with T/E cable though the cpc is smaller, so the pscc is larger in value than the pefc. this is because the smaller cpc has a higher resistance ( approx. 1.66 x ) than the L and N conductors.

Thanks for the help very imformative and easily understandable

 

[martinh89]

There's a list of commonly used acronyms on here somewhere Martin, if you're going to be a regular visitor you'll need em mate.

I have read a few articles and i have researched pfc online and i have come across prospective earth fault current and prospective short circuit current but just never 2 and 2 together with the acronyms, cheers for the help trev

 

[telectrix]

martin, your besr research tool is the thread search on this forum. there's more electrical knowledge on here than wickedpaedophile and grandma's cat put together.

spelling error wikepedia.