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pfc

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  1. B

    high pfc

    Hi all Just a quick one nothing too technical I hope, I've done a quick Ze and pfc test at a consumer unit (origin) and the results are 0.04 ohms and 8.1ka, the main fuse is a 1361 type 2 80 amp 33ka. But the Mcb's are only rated at 6ka, am I correct in saying that aslong as the ka value at...
  2. driverman

    Pfc - pscc on 3 phase supplies

    Hi, Guys,when measuring PFC-PSCC on 3 phase supplies,I know that you test between live conductors L1-L2, L1-L3, L2-L3 and then all 3 to Neutral and note lowest reading obtained. Then all 3 phases ( is that right term for C&G? ) to earth. Then neutral to earth and lowest reading obtained recorded...
  3. S

    High PFC on tns system

    All sorted
  4. N

    Ze and PFC reading?

    Hi all, Im about to start the 2nd year of my apprenticeship and have been practising my testing at my parents home. I have a query on some results. The Ze reading was 0.00 ohms and the PFC was 10kA. It's a PME Supply. The Ze seems too low, does that mean that is is a very good reading or...
  5. S

    pfc

    Hi i am after a bit of advice, I measured pfc at a domestic ccu & got 3.8kA. (PME) Push button breakers 3871 are used for the storage heater board which have a lower breaking capacity that the pfc measured. At the main ccu there were 3036 semi enclosed which are rated around 1 to 2 KA. My...
  6. M

    pfc

    Hi all Ive just done a ze and pfc and the pfc measure 8.2 which is greater than the breaking capacity of the Mcb's. What should I do
  7. Eggster71

    Max PFC gone through the roof....Ideas anyone?

    I've been doing Periodics/ EICRs on some flats for a fella for the last 6 or 7 years, all ok, with the usual small faults, switchline IDs etc. This time though, following some "repairs" that were done in the road a few months ago the max measured PFC has jumped from between 1.7 and 2.8 right up...
  8. Jay Sparks

    E7 Ze & PFC measurement??

    Hi Guys & Gals, So Im fitting two small 1.7kw storage heaters on Monday. There is already two fitting, fed from an old Wylex cu with rewireable fuses. The cable for the excisting heaters are buried. So my first thought was to fit a new 4 way rcd board so I could add the two new ones. Now I know...
  9. N

    Question regarding PFC on a sub board.

    Hi I am trying to carry out Prospective fault Current (PFC) test on a sub board that that is RCD protected and is fed by a main board. My question is how to carry out this PFC (short circuit or earth fault) on the sub board? Do we put the Main switch off in the main board and place the line...
  10. R

    Ze and pfc test on 3 phase board.

    Please can someone clarify this please. I test all three phases on (LE) setting giving me 3 ze readings and 3 pefc readings. I then test all three phases on (LN) setting giving me 3 ze readings and 3 pscc readings. Record the highest reading of the 6 ze readings. Then take the highest...
  11. K

    PFC and circuit breakers

    Hi, I was wondering if anyone could provide any advice on following: I have PFC reading of 9.6 KA and was wondering what the ruling was for short circuit capacity for individual breakers. There are four circuits in total on the board, each currently with 6KA limit. Should these be changed to...
  12. T

    3 phase pfc

    Hi all In order to measure your pefc pscc, you need to test across all 3 line conductors then multiply by 2 record the highest value, this is correct isnt it.
  13. P

    High PFC

    High guys Happy Snowday! Im doing a periodic on an industrial unit and getting pretty high fault readings. This doesn't bother me, the transformer/sub station is behind it so they are going to be high. I just want to know what the best way is to get around mentioning the PFC in regards the...
  14. N6rul

    megger 1730, functions, zs, ze, pfc

    Hello guys, just bought a megger 1730, I'm a bit confused on what range to put the turning knobs, for the ze, zs, and pfc. As I'm used to the fluke mft, I bought this as my first MFT, as advised on the forum. But it has so many functions????? Please can someone help. Thank you.
  15. N6rul

    merger 1730 help, zs, ze, pfc

    Hello guys, just bought a merger 1730, I'm a bit confused on what range to put the turning knobs, for the ze, zs, and pfc. As I'm used to the fluke mft, I bought this as my first MFT, as advised on the forum. But it has so many functions????? Please can someone help. Thank you.
  16. M

    PFC panel Connection

    At work in the main switch room, we have a PFC panel, connected by the 3 phases, each 300mm CSA SWA and an earth. I expected to see a power in and a power out. But there is only one set of cables, and nobody I have asked seems to know why. How does this work? I know what the PFC does and why...
  17. N6rul

    student need help please re: pfc

    Some test instruments display a prospective fault current reading when carrying out an earth fault loop impedance test. Please can someone tell me why the pfc test must be carried out as a desperate test from an external earth fault loop impedance test? My exams are near by I will be much...
  18. S

    Three phase pfc too high!

    I have a three phase dis/board with a measured PFC of 10 kA across each phase (20 kA total) and a Ze of 0.03. The origin is 100 amp BS 1361 type IIb x 3 and the tails are 1.5m long. The MCB's are type B and have a short ciruit rating of 6 kA, should these be changed for 10 kA or higher. The...
  19. N

    Pfc

    Hi guys would just like to understand PFC a little better, here goes....... I was at a job 2day and cut off had 400 fuses rated at 80ka, it then fed a section board with mccb rated at 25ka, it then went on to feed a d/b with mcb rated at 10ka, obviously I know that under a short circuit fault...
  20. S

    PFC Caculations

    Just doing a calculation TT System = 34.97ohms PFC = 230/34.97 = 0.006kA??? is this right?

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