one and the same?cc

[seehig]

pfc and pscc....are these the same animal ?cheers

 

[RF Lighting]

Maybe.

In what context were they used?

PFC could be Power Factor Correction or Prospective Fault Current.

PSCC Prospective Short Circuit Current.

Often also written as Ipsc

 

[seehig]

as in prospective fault current....and prospective short circuit current..cheers

 

[RF Lighting]

In that case then, Yes.

Short circuit is simply the type of fault.

 

[Spark123]

The way I understand it;
PEFC is the prospective earth fault current,
PSCC is the prospective short circuit current,
PFC is the greater one of the two.

 

[seehig]

cheers mate,doing my test and inspect and trying to get the pennies to drop...thanx again

 

[Spark123]

I keep meaning to do the 2391 myself, still time yet though...

 

[seehig]

half way through it,and its ****in hard

 

[Spark123]

I think I will probably do the 3 day course followed by the practical and then the written test at a later date. Do you have any books? I have been advised to read GN3 first, and then by an NIC spark to read the NIC inspection testing + certification book.

 

[seehig]

im doing 1 day aweekx4 ..then the practical 1/2 day, then theory,5days total,in 5weeks..doing this course in 3days u must have to have a serious grasp on what yr about! The book u need is GN3,to be honest its all in there,i use that and the OSG,all the additional booklets give u the same info......good luck

 

[ukants]

The way I understand it;
PEFC is the prospective earth fault current,
PSCC is the prospective short circuit current,
PFC is the greater one of the two.

Are you sure?
If there was a short circuit between live and neutral on a t&e cable with, say, 2.5mm2 live/neutral and 1.5mm2 earth, then wouldn't the PSCC be larger than the PEFC because of the respective CSAs?
Or am I talking b****cks?

 

[Spark123]

PFC is the maximum amount of current which can flow in an installation under any fault condition, this measurement is taken at the origin of the installation where the fault currents are largest. In a PME system the P-E and P-N fault currents will be similar. In a 3 phase the phase-phase PSCC is likely to be largest, if your tester will not measure phase-phase it is recommended to measure the L-N and double the largest value.
It is important to know the maximum fault currents when selecting the overcurrent protective devices, i.e. you should not fit a 6KA MCB if the PFC is 7KA, a 10KA MCB is required unless it is backed up by a device rated at least that of the PFC.