pfc

pfc

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  1. C

    UK High PSCC and strange readings - help much appreciated

    Hey hows it going, So was doing two different EICR the other week. Two different locations, same issue and I’m not sure what the best course of action is. Both constructed in 2016, 100% new. Hager metal dbs. TN-C-S (PME) So for example on one: Original test sheet Zdb - 0.21ohms, 1.18 kA (No...
  2. A

    Low Ze, high PFC in industrial application

    Hi - just after thoughts on this please. I've been doing some testing on a 20 year old MCC. On the original EIC, Ze was reported as 0.04 R, PFC 5.75 kA. Obviously this is a three phase supply, so shouldn't they have doubled the PFC and reported it as 11.5 kA, or is this business of doubling the...
  3. L

    UK Where to measure Ze, opinions welcome!

    Where do people record the Ze & PFC of a 3 phase installation, if there is say 10m of 25mm tails between the 4 pole isolator (next to the meter) and the 3 phase distribution board, therefore some (though negligible) resistance? Do you tend to test at the origin, and record that result, or do...
  4. M

    PFC Testing

    When testing PFC is it ever acceptable to test with Main Switch On, all MCBs On and from the Outgoing Side at DB. The methods I have seen instructed were with the supply isolated from the supply and on the Incoming Supply terminals, but was shown the way described in the first sentence by...
  5. K

    Relationship ze and pfc

    So I’m currently studying Ze and pfc etc kind of understanding it. main question really is about the relationship between them both I understand that the lower the Ze the higher the fault current but why is this? Is it just simply to do with ohms law? And I’m just over thinking and confusing...
  6. D

    PFC

    Hello I am wanting to know if any one can help me with a question I have in regards to PFC. When testing PSCC and PEFC in order to find out the PFC, so that this value can be recorded and then compared against the breaking capacity of the protective device, on what part of the system is...
  7. S

    PFC question

    PFC question.. Guys, will the size of the metre tails affect the PFC reading? At the moment, believe it or not, the metre tails are only 6mm! The PFC is 407a....the tails will be changed to 25mm....so will the PFC change when the new tails are installed?
  8. GBDamo

    High PFC.

    The company is in the process of dropping a gable end which requires many circuits being cut back and then reinstated. I advised we do an EICR, although not due and for info only, to get a baseline on the installation before we start ripping it to pieces. It was approved and despite the age...
  9. CokeCanBrad

    UK Three phase testing PFC

    am i correct in thinking for determining the PFC, you can do a PEFC test aand PSCC test and which ever one is highest you can double and choose to be your PFC also is it true for 3 phase that PSCC Is usually always higher? Ive seen some people croc on to the earth and croc onto the neutral and...
  10. A

    UK Need help with some college questions

    Hi could anyone help with some questions for college? Possible effect of TNC-S earthing arrangement has on pfc compared to TN-S?
  11. Zdb

    3Phase PFC

    After having a discussion with a colleague earlier today I was wondering what peoples preferred method is when testing prospective fault current on a three phase distribution board. Do you: A. Perform a 2 lead test between L1-E, L2-E, L3-E, L1-N, L2-N & L3-N then double the highest value. Or...
  12. J

    Ze & Pfc (Pefc & Pscc)

    I hope someone can help me as im getting different answers off different people 3P & N Supply Ze: Disconnect main earth Set tester to 2 lead high L+PE (is this correct?) test between L1 - E / L2 - E / L3 - E recording the highest reading Ze (reconnect main earth) Pfc (Pefc) Set tester...
  13. T

    PFC measurement question

    Hi folks, I'm carrying out an EICR on a 3-Ph board which cannot be isolated fully - only certain circuits at certain times. Supply protected by 3x 88-2 fuses. When carrying out PSCC/PFC, I'm getting a small spark at the probe on the neutral bar/MET intermittently. Can anyone explain this? The...
  14. Z

    PFC test theory question

    Hi all! I'm at the start of a long road to become a sparky's mate, and I'm tryina wrap my head around something that might seem really basic. It's to do with the prospective fault current test. Let's say I get a reading of 1.2ka, and the main cutout fuse is BS 1361 type 1 which is 16.5ka. This...
  15. K

    AM2 testing

    Hi everyone, a few questions here Ze: In the AM2 is it just a 2hi test between L1 - Earth, L2 - Earth and L3 - Earth. Then take the highest reading out the three? and while doing that take the PEFC reading at the same time? after reconnecting the Main earth would I record my test result...
  16. L

    PFC reading

    Carried out a ccu replacement and then started testing, my PFC was 38A & 6.11 ohms. Just wanted to have some thoughts as mine was that there must be a poor connection or break in the main cpc? Thanks
  17. gazdkw82

    Megger MFT PFC error message

    I used a friends Megger today and we both came up with an error he hasn't seen before. We was performing a PFC test at the imcoming of a new DB. Leads were in line and neutral ports and tester set to L-N, 2 lead test, Zmax. As soon as you make the connection the tester beeped and flashed <PE>...
  18. Davehaywire

    PFC removal industrial unit

    Hi Been asked to remove a pfc unit in an industrial unit Has any1 had any experience in removal of a pfc unit and if so is there a safety procedure to follow and a way of discharging the unit correctly Any advice would be great
  19. M

    PFC reading of 8ka on domestic installation

    Hello , ive just got off the phone to niceic regarding a pfc reading of 8ka. Ze reading of 30.2 ohms on a tt installation and pfc of 8ka. MCBs rated at 6ka so obviously I was not happy with the higher test result. Niceic said all was ok due to 230 divided by 30.2 = fault current of 7.6A and...
  20. R

    AM2 exam is Monday Morning Need Help with PFC testing on 3 phase and rcbo testing on lightingcircuit

    Hi everyone, Not going to lie I am crapping my self for my AM2 exam on Monday Morning at 8:00. So I just need a few questions answered:- tell me if I am right or wrong. I will be using a megger tester by the way. PEFC testing 3 phase ( 3 probe test) :- Clamp croc clip on the neutral bar...

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