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pfc

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  1. C

    PFC measurement?

    Hi all, have read various threads on this forum regarding PFC measurement but still need a little advice please. Does anyone have a definitive calculation for PFC in ac single phase supplies? I have just measured PFC in a particular SP domestic installation and I get a reading of 549 amps...
  2. Z

    PFC reading

    Hi guys, I just finished some work, 3 phase motors on a new distribution board. Measured the PFC which comes out as 40KA (two times 20KA measured since it is three phase). Now which devices should clear this value? The isolator in the main distribution board which is supplying the new...
  3. B

    pfc testing

    can any body give me the reason why when testing pfc and pefc at a three phas DB why do you have to test all phases to neutral then all phases to earth why not just one phase surely there will be very similar results if not the same just thought iwould ask cause it was buggin me..
  4. J

    Pfc testing

    Hi I know how to test PFC at the origin of the Installation but how do you test PFC at other points in the installation does this mean on the individual circuits like the ends of them, and what about the earthing conductor is it disconnected or connected.and if disconnected why?
  5. B

    pfc test

    I have not done much testing in my time as an electrician, and i am wondering if someone could help me with a few tests i cant seem to get the hang of?? They are : PFC (trying to fill in a test sheet and need to find out how to find the PFC for the DB?) Ze (again trying to find the Ze at...
  6. 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...
  7. L

    very low pfc on submain board

    hi all hoprfully someone here can answer this question for me: i tested a sub mains today and i only got 0.35 KA is this normal for a submains as at the main mainsboard the pfc is 3.3 KA the main fuseboard has a rcd main switch so at the submain i had to use no trip pfc not sure is this makes...
  8. B

    why Pfc is 16kA in Installation Cert?

    In the Installation Certificate, the Pfc of supply is 16kA, but on the top of testing results, the Pfc normally is 1 or 2kA, normally less than 6kA. Why the 2 numbers are so different? cheers
  9. E

    high pfc

    can anyone help? 3phase service head to block of flats,TN-cs earthing arrangement,80 amp cut out feeding 1st flat tested Pssc = >19.9ka tested pefc = >19.9ka tested ze = 0.01 mcbs only rated at 6ka, do i have a problem????? would appreciate any answers
  10. P

    pfc

    today i was doing inspection and testing of a large building with 26 boards. the part i was doing had 3 DBs about 60 m away from mains inlet and one of the boards is on a 100A supply with 25mm 4core 3ph cable which i think is to small well for VD any way because some runs from the DB are a...
  11. T

    High PFC

    Looking for a bit of advice going at the back of a company who carried out a periodic in a shopping centre. In the observations they have listed as a code 1 that the Ka rating of the MCBs are unsuitable for all the circuits in the DB as they are 3Ka with the PSC 4.8Ka. But i thought the 4.8Ka...
  12. C

    PFC Readings

    Hi All, Just a bit concerned :confused: about some low PFC readings taken recently, all on TT supplies. 1st reading was 1.1Ka on Live/Nutral and 11A on Live/Earth with a Ze of 65 ohm for the earth spike and 2nd was 1K on Live/Nutral and 9A on Live/Earth with a Ze of 28.5 ohm. Just a bit...
  13. flukey

    Pfc on a tt

    hi all, tested a board on a house today, TT system and got a PFC reading of 50 amps :confused: does this sound right :confused: ZE is just over 7 ohms
  14. P

    Pfc low?

    got a reading today on the main board of 4.1 KA and the sub board was giving me 200amp? thoughts
  15. V

    Pfc test

    can anyone tell me when its unnecessary to perform one at each sub-main DB on an installation ?
  16. E

    3 phase PFC with mft megger 1552?

    Hi! Just wondering if its possible to messure 3 phase PFC with this modell? Does anyone know if ther is a bigge manual for this modell ? I only got 8 smal pages.
  17. A

    Pfc reading

    Hi, I have recently tested a new installation i have completed on a domestic property. All the relevant tests were completed and verified as ok. However the PFC reading was > 10ka. My Fluke test instruments only give a greater than value if 10ka is exceeded, so I do not have the actual...
  18. S

    Pfc

    Hello Everyone, Can anyone tell me what the PFC (prospective fault current) for BS3036 and BS1361 fuses and where can I find this information? Is it in the On Site Guide or BS7671 Regs? If so what page/reg number? Thank you in advance, StagsHeadNo.4.
  19. S

    PFC Reading

    I did a test yesterday on a new build i've been working on & got a reading of 4.8 kA for PFC. Any ideas why such a high reading, i was expecting lower. Ze was 0.05
  20. C

    super high pfc

    Working in a high rise block of flats bout just under half way up!! changed the c/u now my ze is 0.01 prob parralell paths,however my pfc is 19.9 ka!!! is this supply problem or because its high rise flats!! 3 lead method used live to neutral(black and green lead together) and live to neutral...

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