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pfc

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  1. G

    PFC with Fluke 1651

    Hi Guys I use a Fluke 1651. When testing Loop Impedance the tester calculates Prospective Fault Current by diving the measured mains voltage by the Loop Impedance and it displays the result at the bottom of the display as Ik PFC, I was wondering if this method that the fluke uses is the same...
  2. johnboy6083

    Pfc

    hi ladies and gents, system= TNS, tranny 5m away on pole, 70mm tails, 3ph tester= megger 1552 was on a shutdown the other night, and after doing my bit in the main MCC, i did my live tests. i disconnected all bonding and earthing conductors, and took my readings. ZS is 0.01, which i...
  3. C

    pfc pscc

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

    pfc test

    basically im working on a three phase installation. ive done a pfc test and im getting some abnormal readings. my ze is 0.02 ohms pfc is 19.9ka so times this by two will give me 48.8 ka im assuming that this installation is sitting on a substation hence the low ze, is this reading normal, the...
  5. N

    PFC Help please

    I need a bit of help! The scenario is: Incoming supply to Henley block then out to two separate CU's. TNC-S Ze = 0.32 PEFC = 0.71 kA PSCC = 0.71 kA But when PSCC taken at CU 2 0.00kA ??? Kewtech KT60, three leads green to neutral bar Any ideas???:confused: TIA
  6. J

    pfc testing

    hi all, i have carryed out a pfc test at collage! i am confused about useing the 2 or 3 wire test. i have read that u put the megger on pfc high and test between L incomer and E with all earthing connected. but i spoke to another spark last night who said u need a 3 lead test to test between...
  7. W

    very high pfc

    i started to do a pir today for a rental property,however the owner made a mistake as it was a energy efficiency cert he needed and not an electrical cert so i stopped, i had taken a few measurements and found a very high pfc ,the instrument showing>19.99ka,with a ze of 0.3,system tns.is this a...
  8. K

    Motor, transformer & PFC

    Have had a major PC crash and I've lost the spread sheets I wrote for this Forum. could someone please e-mail them back to to save me having to rewrite them please
  9. L

    High PFC

    Hi Guys Any advice would be much appreciated! I have tested a property that has a PFC greater than the short circuit capacity of the mcb's protecting the final circuits, the PFC is 7.9KA and the 60898 mcb's 6KA. The property is protected at origin with a 1361 type b fuse 16.5KA. Under the regs...
  10. S

    high pfc reading

    can anyone out there throw up any ideas as to why i got a high pfc reading of 15.2 ka on a domestic installation??
  11. P

    PFC on 3 phase with a megger 1552

    I know that often people will just test PSCC as that should be higher than PEFC so test between L1 - N, L2 - N and L3 - N then take largest value double it and record that value. However was looking through the user guide for the 1552 and noticed that you can test phase-phase pfc. Does this...
  12. B

    High pfc readings

    just installed cooker cct, rcd fuse box,earth bond main services etc. tested ze which was 0.02ohms and the pfc reading was 12.2 ka which i thought was very high, i asked a few electricians at wholesalers what they thought, no one has had a reading like that, i have borrowed a mates meter, tested...
  13. A

    Problems with Zs (and possibly Ze and PFC) Using Megger MFT1553 Tester

    Have just completed a consumer unit change, Ze is reading at 0.09, PFC reading at 9.5kA, Its on a TN-CS System and about 150m from nearest transformer. I am not highly experienced in Testing, and unable to establish what is going on, but I am suspecting there is a big problem! I am using a...
  14. D

    PFC help.

    Doing a PIR on an installation and one of the DB's is an old crabtree C50 3phase board ,with the old white lettering breakers which are M3 rated....now I've a measured single phase PFC/PSC of 1.7ka...which gives a max phase-phase result of 3.4ka. All of the final circuits from the DB are single...
  15. S

    PFC & Water & Gas bond

    Hi All I want to clear some bits up as i have been picked up on them and feel a bit stupid 1 ) To do my PFC test leaving all earths in block and all breakers on including the main switch i place an earth clip over the earth block and with that place the neutral probe. I then place the live...
  16. N

    PFC and ZE testing

    Morning all I am new to testing and electrics so if my questions are stupid and the answer obvious then I apologise, but we've all got to start somewhere. I have been doing various electrical jobs around my home. Rewired the shower, cooker and central heating system. I have also rewired the...
  17. 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?
  18. J

    pfc on 3 phases

    when prospective fault testing a three phase circuit do you only need to do the short circuit test only on the 3 phases in turn due to result being twice that of the earth short circuit current due to the line voltage being twice the value?
  19. M

    pfc test

    please can someone clarify something for me. when a prospective fault current test is performed at the supply side, is this to make sure that its lower than than, lets say 6ka of the breakers capacity or the supply fuse capacity. the reason i asked this question was i performed this test today...
  20. F

    Pfc testing result

    Hi, anyone who can briefly explain to me how a reading at a 3-phase board on the pfc can be said to be " quite satisfactory " being show as >19.9ka the zs at the dist board was 0.01 i phoned an experienced test engineer about my reading as i have not come across one this high before and...

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