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pscc

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  1. N

    Max PSCC 1 phase and 3 Phase

    Hi all. Prospective Short Circut Curret. Now , if you measure the impedance on a installation P to N , and get a reading of 0.21 OHMS , the max current flow between these two points P and N will be 230/0.21 = 1095A.....1KA. Now if you have 3 phases , and each are the same impedance P to N ...
  2. S

    recording pscc

    what document are you required to record your pscc reading, some one mentioned also the minor works certificate but cant find a place for it on there?
  3. F

    pscc pfc values

    just done eicr on a 3 phase db LI= 1.33KA L2=1.44 L3=1.48 THESE ARE THE PSCC VALUES SO ADDED TOGETHER THEY GIVE ME 4.25 KA THE LAST TEST DONE 5 YEARS AGO WAS 5.5KA NO WHAT WOULD CAUSE THIS TO BE LOWER NOTHING HAS CHANGED IN DB AND I NO THE READINGS ARE ACCEPTABLE YOUR THOUGHTS PLEASE
  4. F

    Help to understand pfc pscc values

    Can some one explain if your pscc value is say 4.6ka well in gn3 it says that your protective device must not be less than that value so say the protective device was 5ka how would the protective device trip if it's fault current was only 4.6ka please explain cheers lads
  5. F

    pscc pfc tables

    can any one tell me what table or page in reqs for max values for pscc or pfc
  6. A

    Live Testing - PEFC / PSCC

    After a little bit of advice please We are doing our Dead and Live Testing at college tonight. I am ok on most of it but due to not having much time to practice our live testing I need a bt of advice. Live Test: CCU breaker off Prove VID - Test for dead with VID - Re-prove Ze - remove main...
  7. S

    High pscc ????

    Hi All, Can any body advise why i am getting a reading for PSCC L-N of 10KA ??
  8. G

    PSCC Readings

    Hi I have just qualified as an electrician but am wanting to do my wiremans license and have been told to do some inspection and tests before doing the exam so that I can have a practical understanding of the system. With regards to this I did a PSCC test on a simple installation. Using a SUB...
  9. S

    Am2 - testing questions, pscc

    I have my am 2 comin up and its on a 3 phase board (TNC-S) my question is when doing the live tests first i would do the Ze with the high current 23A setting (Megger LT7) between each phase and removed main earth (main switch off and on supply side) then work out Zs = Ze + (R1 + R2) and use...
  10. C

    pfc pscc

    can anyone tell me the stated difference between prospective short circuit current and a prospective earth fault current test cheers certa :)
  11. S

    High ze reading pefc and pscc

    I have just done a consumer unit change and on testing for Ze, PEFC and PSCC got the following results - Ze - 2.20 (This is very high - what might be the problem and what can I do?) Test with main earth disconnected L-PE 135 KA ( Very high ?) Test with main earth connected L-PE 111...
  12. T

    low Ze high pscc ????????

    :confused::confused:hi all testing new install warehouse units 2 of first unit Ze 0.09 PSCC 2.45 KA second unit Ze 0.01 pscc off the scale of 20 KA am i too close to sub station help lol
  13. E

    Pscc / Pfc confusion

    Hi all. Can someone please explain the difference between the two. Also if I know the Ze on a single phase installation is it a simple Ohm's law calculation to find out the Pscc?
  14. B

    pscc and pfc

    Hi everyone Im fairly new to electrics and the forum, im looking for some help on testing of a PME supply, It is my understanding that because the neutral and earth are combined the psc and pfc should measure the same. (as told by my assessor from Elecsa) I have a pfc of 3ka and a pscc of...
  15. J

    pscc

    Just started back testing after 3mths install work,its easy to forget things after a break.On the last pir we did 3 phase pscc was noted on meter then this measure was doubled and put on test sheet(as it was 3 phase) Now starting on this job the guy in charge does not double this measurement...
  16. G

    PEFC - PSCC the same on a TT

    Setting up a temp site board in a little brick bunker, DNO haven't supplied an earth as its an out house. So I've installed a rod and am getting a Ze of 44.7 ohms. Now my PEFC and my PSCC are both 5A's. Why are they the same as its now TT? Should they be the same :confused:. Should'nt the...
  17. A

    Pscc = pefc ?

    TNCS system am I mad went to a house today PME system PSCC and PEFC are supposed to be the same got 4.8kA at main switch and when I did the PEFC I got 7.1kA is this correct and if not what would cause it. Thanks in advance. Chris Sorted just tried the same tests at home looks like my...
  18. H

    pscc, pefc and pfc

    got a submain feeding a consumer unit, bit unsure with the pscc, pefc and pfc pscc would be voltage / resistance of live and neutral cables plus the ze pefc would be voltage / zs how do i get pfc, is this just the highest of the 2 readings? if i was fitting a 3 phase board pscc would it just...
  19. S

    calculating pscc

    i'm currently studying for the 2391 exam and have been asked on a mock exam paper to calculate the pfc and pscc of an installation. Its a 3phase system supplying circuits of 400/230v 50hz with a Ze value of 0.2ohms. I know the calculation for pfc = V/Ze but how do you work out the pscc. Its my...
  20. T

    New to testing... Ze, PSCC & PEFC

    I am new to testing and im trying to learn all i can about each test. Today i have been practicing my Ze tests, PSCC & PEFC. Please can someone tell me if i am performing the tests the correct way and if my results look genuine? (I have a feeling my results on this occasion are way out) I...

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