impedance

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  1. P

    1st Generator install

    I have been installing a 3 phase 60KvA generator connected to a MDU with a 100A 0.1A RCD, when I test the earth electrode resistance (Ra) using the earth fault loop impedance tester I get a reading of 1845 ohms, as this does not meet the Ra x Ia less than or equal to 50v, 1845 * 0.1 = 184.5 , it...
  2. K

    Earth Fault Loop Impedence question

    hello, i got this qustion and would like someone to show me the working out of it please. the measured value of loop impedance for a circuit is 0.83 ohms. if the temperature at the time of the test was 20c and the cable is 70c (factor1.2), what is the correct value. ze = 0.4 ohms
  3. W

    Caravan Earthing, Higher impedance?

    So I have a static caravan that has a hookup to the house, And I wanted to improve the earthing by installing one specifically just for the caravan, So I have driven in around 4ft of copper pipe and used 30a capble to earth both the chassis of the caravan and the metal exterior, but upon...
    • whitenight639
    • Thread
    • caravan earthing electricians vans higher impedance van vehicle
    • Replies: 33
    • Forum: UK Electrical Forum
  4. R

    Earth Loop Impedance on a TT system

    Afternoon all, I did a standard Ze test on a TT installation yesterday, and got a value of 215 ohms. The ground is really wet at the moment and so I'm assuming its about as good as the rod is going to get. Would simply replacing the rod with a longer type improve the Ze result? and if not...
  5. sparkymalarky

    MCB's 230V/110V Zs Earth fault loop impedance values

    I give these out to some of our younger electricians in the aim to get them familiar with such values. Probably old news to most of you fellas but sure it won't do any harm. Calculations from BS7671 anyway, just handy to have a hard copy other than BGB. Cheers John
  6. S

    KEWTECH KT64 loop testing..

    hi guys when measuring loop empedans with kt 64 it gives me 2 option by chosing with f1 L-n l-pe which one shoul be used?? Thank you very much..
    • Scorpion90
    • Thread
    • current impedance kewtech loop measured reading testing
    • Replies: 6
    • Forum: UK Electrical Forum
  7. S

    AC Circuit Theory Maximum Power Transfer

    Hello All, I am currently hitting a barrier with regards to the basics of this question. It is for a HND so I may have put this in entirely the wrong forum. Apologies if so. A 50HZ supply is connected to various given impedance's connected in series and parallel. Calculate the value of the...
    • serpico4321
    • Thread
    • circuit impedance maximum power
    • Replies: 24
    • Forum: UK Electrical Forum
  8. T

    PME Earth Impedance and RCT times - advice ;-)

    Hi all, great site and sorry for the long post - I'm after some advice as I don't have total confidence in the 4 sparkies I've currently used with regards to the test results on my cert. That said I am not a sparky and if I'm being a total muppet please tell me - I can take it :-)...
  9. M

    Prospective fault current ?

    Can somebody please clear up for me what is prospective fault current? Am i right in thinking its the value of overcurrent you get through fault conditions like short circuits and live conductors and exposed conductive parts ? Thanks
  10. P

    0.05 Max Impedance for Main Bonding Conductor

    Got massively ribbed on another post for not knowing that max impedance for a main bonding conductor is 0.05 ohms, so I expect some more for this post!....... I'm going to assume there is a very simple answer for this, but despite me going blind reading GN8 I can't for the life of me work out...
  11. E

    Earth Loop Impedance testing

    I have a standard KT71 pat tester and have been offered a job testing cash registers. The problem is I will be expected to also carry out an Earth Loop Impedance test and I do not possess the kit or the knowledge to do it. I am considering sub-contracting the Earth Loop Impedance testing part...
    • elsid
    • Thread
    • earth impedance loop loop impedance qualified someone testing
    • Replies: 6
    • Forum: UK Electrical Forum
  12. rustynails

    2392 Question: Maximum earth loop impedance for 20A BS88 (gG) fuse

    What is the maximum earth loop impedance to BS7671:2008 for a circuit protected by a 20A BS88 (gG) fuse giving a 5 second disconnection time is: A: 7.42 B: 2.91 C: 1.84 D: 1.35 The green book says the ln for this type of fuse is 78A p299, that doesnt give you the right answer though. :confused5:
  13. P

    earth loop impedance

    client had washing machine eng. called out....who tested the single switced socket??? (w/machine drum fault) and on his rport indicated a higher than acceptable earth loop impedance (254 ohms) as a result im sent to check installation...theres nothing wrong with the installation however a...
  14. F

    Fluke 1563 - Loop Impedance Test problem

    Does anyone have a problem with their Fluke 156X testers when doing Loop Impedance Testing ? Most of the earth systems I come across are TT and my meter will on the odd occasion show >2000 ohms and then on a repeated try I get the correct answer. I think the problem gets worst when the L-N...
    • fjr1300
    • Thread
    • firmware fluke found impedance loop loop impedance other problem reading test
    • Replies: 3
    • Forum: Electrical Tools and Products
  15. A

    Cable selection, calculating earth fault loop impedance

    Hi guys, struggling to work this question out and don't seem to be getting a correct answer no matter what cable conductor size i use. Q. A 230V 14kW domestic electrical cooker, installed in a house is to be supplied by a 15m run of PVC insulated and sheathed cable, clipped to a surface. The...
    • atto2007
    • Thread
    • cable calculating circuit cooker diversity don't earth earth fault loop impedance fault impedance loop loop impedance
    • Replies: 21
    • Forum: UK Electrical Forum
  16. G

    socket testers earth loop impedance indicators

    can anybody tell me if these are worth using as a fault finding tool they claim lots on them,anybody used them?:icon3:
    • garysparky1
    • Thread
    • check earth impedance loop loop impedance socket socket testers tester testers
    • Replies: 5
    • Forum: Electrical Tools and Products
  17. R

    why a low earth fault loop impedance

    hi guys, Just wanted some help with some course work for college. Any help is greatly apprecitaed. Why should a low value earth fault impedance should be achieved for all circuts? thanks
    • Ryan Kavanagh
    • Thread
    • current earth earth fault loop impedance fault impedance loop loop impedance value
    • Replies: 19
    • Forum: UK Electrical Forum
  18. M

    Earth Loop Impedance Test and problem with power supply

    Hi, Our main fuse from the power distributor blew and Western Power attended and replaced. During this visit they established that their was a problem with reverse polarity and that when the RCD was installed the tails in the grey twin cable were connected red-black in the top of the consumer...
  19. S

    The Value of External Impedance (Ze)

    Hi everybody can anybody help please all answers will be taken into account for proccessing thanks... can you please explain to the Newbie (ME) why is the value of external impedance (Ze) required during the design stage of an installation.. THANKS.....
    • Sparky12021986
    • Thread
    • aus external impedance value
    • Replies: 4
    • Forum: Australia
  20. T

    Line to earth fault but MCBs will not trip..Why?

    I was called to a single phase installation in a pub as the staff were receiving shocks when touching equipment such as fridges water pipes etc. I located a damaged cable where line and PE conductors were touching and causing 240 volts on the entire earthing system at the installation. In other...
    • timmy123
    • Thread
    • aus earth fault impedance mcbs
    • Replies: 20
    • Forum: Australia

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