earth fault loop impedance | Page 2

earth fault loop impedance

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  1. spud1

    High Earth Fault Loop Impedance readings caused by RCDs

    Hi everybody, I have encountered a problem with EFL (Zs) testing a couple of times recently. I have had unusually high readings for the length of circuit and earthing system type and the increase in impedance seems to be coming from resistance across the line pole of the RCD in the consumer...
  2. G

    External earth fault loop impedance Ze

    ​Can any one explains what are the three methods to find External earth fault loop impedance Ze please?
  3. 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
  4. 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...
  5. 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
  6. T

    Earth fault loop impedance readings through a UPS supply

    Does anyone have any experience in recording values of EFLI on circuits fed through a DB supplied via a UPS please? The meter shows the above scale arrow. I understand that there will be no reference to the external earth due to the inverter inside the UPS but what will happen to the UPS...
  7. V

    External earth fault loop impedance Ze

    Hi all Just checking this procedure is correct for Ze This is a live test so with the consumer unti front off i would lock off main switch keep RCDs on and all MCBs on. Dissconnect the main earth. Now on the megger 1553 i would set it to no trip and use the 3 lead method ? So green...
  8. T

    Earth Fault Loop Impedance Ze test at origin

    Hi, I have a my am2 practical testing exam next week and I'm confused about the earth loop impedance test. The centre use a three lead instrument, I just want to know if this is right. Connect the third lead to the neutral bar, and connect one lead to the earth bar Then measure over the...
  9. V

    Earth fault loop impedance

    Can somebody help me on how to test the earth fault loop impedance(Zs) of the following circuit Cooker,Immersion,motor .i have tried but the tester display :confused:
  10. J

    Earth fault Loop Impedance Question

    Hi All, Q: If an earth fault loop impedance instrument records a valve of 0.55Ω at 20°c, what is the corrected valve ( Using the rule of thumb method ) to allow for conductor maximum operating temperature? Any replies will be appreciated.
  11. W

    Earth fault loop impedance reading on TT System in domestic premises

    Hi All , I am new to this forum but am an industrial electrician (20 years) but have been using my Robin KTS1620 Multi tester in my house to do a few tests as i am considering returning to partp work as my industrial work is quiet. The house is supplied by a TT System through a 100mA RCD. I...
  12. D

    Help Please - max earth fault Loop Impedance value table needed urgently

    Hi everyone Would be really grateful for your help on this. I have my 1st NICEIC assessment on Monday (am bricking it) - anyhow I only have an old table & I need one like you get on the back of the proper NICEIC pads - the most up to date table. Has anyone got one they could send me so...

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