loop

  1. T

    Earth loop impedence Zs for 3ph systems

    I know on a 3 phase supply system ie; a DB, you measure PFC & PFCC taking the highest of the two reading and doubling it. This is then recorded. But what about say a 3 phase motor for example where you measure each Line and record it on the schedule of test results. Is the result recorded as is...
  2. S

    Earth Loop Impedence Increases

    Anyone got any ideas? Measured R1, Rn, R2 end to end and 0.34, 0.35 and 5.6 ohm. Measured R1, R2 crossed and got between 0.21 and 0.23 ohm at the back of each socket on the ring. Measured Rn, R2 crossed and got between 0.20 and o.23. All results random and probably caused by pressure / probe...
  3. R

    R2 testing and Earth loop testin down lights

    Doing an EICR. the house has loads of down lights. To test propely do i need to remove each down light and access the earth in a connector block. Assuming there class 2 fittings. Customers not that keen on me removing them from newly decorated ceilings. Also the customer doesnt want me to...
  4. H

    Earth Loop Question

    Hi guys, i after some help with an Earth Loop question, first thing first this is not coming from a sparks prospective so the regulations are not relevant here to a point. I work in the domestic appliance industry, i contract to one of the big manufactures, as part of our initial tests on the...
  5. 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
  6. W

    High earth loop on bathroom light with fan?

    Hi there I was testing the earth loop on a bathroom light with the fan pull switch turned OFF (not double pole) and got a reading of 330 ohms. When I turned the fan on, the reading was down to 0.60 ohms which is obviously ok. Would this be due to the neutral not being switched from the...
  7. M

    Instaltest 61557 Alphatek RCD- Contact Voltage and Fault Loop Resistance?

    Hi I just purchased one of these and downloaded the Instaltest 61557 manual. In the RCD menu (No 10 setting of the Function Switch), The manual says set the function switch to Uc,RL "Contact Voltage" or "Fault Loop Resistance and the initial menu" will be displayed, Uc or Loop message starts...
    • mec
    • Thread
    • contact fault loop rcd resistance voltage volts
    • Replies: 8
    • Forum: UK Electrical Forum
  8. 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:
  9. A

    what are the three external parts of the earth fault loop of a circuit?

    What are the three external parts of the earth fault loop of a circuit?
    • Abby2000
    • Thread
    • circuit earth external fault loop parts three
    • Replies: 4
    • Forum: UK Electrical Forum
  10. M

    Earth fault loop testing at furthest point

    Heres one. Over on another forum a poster has said that when doing loop tests they always test at the furthest point - which is correct, however they then go on to say that if they were testing a water heater circuit they would test at the connection point on top of the heater rather than at the...
  11. S

    Fire Alarm Loops? Separate sounder loop?

    Should a fire alarm be wired in two separate loops one for call points and detectors and a separate for sounders? I heard this today and wasnt sure it was right, does anyone have any detailed info on how loops should be wired, if there should be 2 loops or all devices on one loop being ok?
  12. 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...
  13. S

    Robin De-lock Loop Tester

    Hi all, Just wondered if someone could tell me why my Robin Loop Tester with de-lock will only test through BS4293 Rcds? As soon as I use it on a 61008 or 61009 it will trip it? I do normally use a megger with de-lock and its fine, but I like to use the robin for industrial/commercial tests.
  14. O

    PFC & Earth Loop Imp Tests.

    Alreet all, Went for an interview for a FM company recently and got asked a couple of, what I thought were, ambiguous questions. Thought i'd find out what everyone else thinks. 1) What would you expect to find during PFC test? & 2)What would you expect to find during Earth Loop Imp test...
  15. P

    earth fault loop three methods?

    when confirming auto disconnect of the supply it is necessary to determine the external earth fault loop impendance of the system. What three methods can this be achieved? So the external earth what loop impendance is the supply companies end is that right?
  16. oxford 12

    earth loop readings

    Just done a test on a TT system,and got 150ohms on the rod.But got 0.33 on the cooker circuit. Am i right in thinking the Zs readings are such due the main bonds bringing the resistances down,never had this before
  17. 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
  18. J

    Earh loop problem

    I replaced a fuse box last week and when i did the earth loop on the circuits it came up with around 114-ohms yet the ZE was only 0.75-ohm can anyone explain this
  19. 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
  20. G

    For Sale Amecal Earth Loop / PSC Tester

    Brand new , never used Amecal ELI / PSC testers for sale. Comes with carry case , probe leads , plug top lead , instructions and purchase receipt. No calibration cert but in perfect working order ( as shown in pics below ) £90 inc P&P. Thanks for looking.
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