loop

  1. S

    Would it be ok to replace an earth nut on a ceiling light with a cable / cable and loop?

    I am replacing my ceiling rose with a metal 4 spot light bar, the cables are to short to be able to secure them unless I release the block from the light it’s self. I can then wire it with ease but can’t get the block back into the fixed earth nut. Would it be ok to replace this nut with a...
  2. P

    11kv pole loop fault, over voltage ?

    Hi first post, I'm a pretty well experienced electrician of 15 years now working solely in Agricultural electrical We have a lot of voltage sensitive equipment on our farms which run auto ventilation and alarms ect Today we had a huge bang from the 11kv pole transformer on one of our sites...
  3. R

    Loop testing question

    Hi All Whilst carrying out some testing today I had the following messages on my Kewtech KT64DL. L - N >20ohms - this was on the ring on only one socket, all others tested fine. Could this be a faulty socket? n-pe hiv - this was on the upstairs lighting circuit. Was testing in the loft where I...
  4. S

    Zs and Ze - both called 'Earth Fault Loop Impedence'?

    Can someone explain this to me? The regs book calls Zs 'Earth Fault Loop Impedence' and the On-Site Guide calls Ze 'Earth Fault Loop Impedence'.
  5. tadast

    Hotpoint HMB313I fridge clicking on and off continuously

    Woke up to my fridge clicking on and off every few seconds. It seems like it’s trying to start but then a relay/switch trips and it turns off. The lights inside and the LED display go off as well when it “clicks”. Here’s a video Is this a common fault that’s easy to fix by replacing a part or...
  6. RobertKza

    Why loop the live for lights?

    I have one mcb in the consumer unit that supplies external lights. When this is off the coal shed, shower room main light and toilet light don't switch on. There is a light switch in each of the shower room and toilet. There is a 2 gang light switch in the shower/toilet access passage. One...
  7. J

    Loop impedance measurement

    Hi, All I have a megger LTW325 and fluke 1664FC to measure loop impedance by using high current mode. But both results are quite different. megger LTW325 is given a value 0.04ohms and fluke 1664fc is given a value 0.12 ohms. Means megger can give a current at 230V/0.04=5750A but fluke is only...
  8. J

    UK Earth loop fault impedance help

    Hello I’m a student learning about industrial wiring and circuits and we’re about to start learning about how to do loop impedance calculations. I have made a drawing of a three phase installation and was wondering if anyone could give me information on how I get the Ze Zs and R1 + R2. How would...
  9. E

    Loop Impedance reading

    Hi I bought a holiday lodge last month and decided to test the circuits to see how they measured. The lodge itself is fed from a central point in the holiday village by a 16mm PVCSWA. The main earth wire terminates into a MET it looks to be a 10mm earth that is crimped onto the incoming earth, I...
  10. T

    Fault loop impedance testers

    Hi just wondering how most are testing fault loop impedance and which testing units are best
    • Tony hu
    • Thread
    • ausie elec fault impedance loop loop impedance testers
    • Replies: 1
    • Forum: Australia
  11. S

    Two white cables loop link

    Has anyone ran into this issue when replacing a vanity light? The white thick wires are continuously looped and on one side of the loop the wire is marked with black tape. Do I wrap both black wires to half of the loop? Thanks for any advice.
  12. S

    Switch loop?

    Hello, Grateful to have found this forum to hopefully get some clarification. We purchased our 1965 built home last august and at the same time purchased some utilitech canless lights to replace the two track style fixtures hanging in the kitchen. A year later and I finally got to install said...
  13. Weezy

    UK Exceeding the max Ze in this situation still be considered to comply?

    If the max Ze for Tncs is 0.35 but you had a 1361 60amp fused isolator before the c.u with the 1361 having a max Zs of 0.56 (from the 80% chart) if the recorded reading at the c.u was let’s say 0.47 ohms would that now be considered to comply? i can’t see why it wouldn’t.
  14. C

    MV Fault Loop

    I've been thinking, do disconnection times apply to MV? Say a fault occurs on the MV system. This would result in 3kv from the MV neutral to remote earth. In theory this voltage would end up on the LV neutral, enter the structure, cross over to the MET in a TN-C-S supply and then energize all...
  15. R

    The measured value of loop Impedance for a circuit is 2.4 Ohms

    Hello trainee forum thank you very much for letting me in here and as a consequence hopefully helping me to develop my skills and knowledge. I'm currently focusing on the 2391 and have enrolled myself on a course with no previous Inspection and testing experience or Knowledge so I do feel kind...
  16. F

    Lighting Wiring Enquiry Question

    Hello, I have a question that I am hoping someone here will be able to help me with. In the diagram below I have Light 1 wired to Switch 1 from the feed that is working fine as needs to remain as is. Light 2 with Switch 2 needs to be wired from switch 1 as I do not have access to take the...
  17. Madmankm

    Old house wiring issue newbie here Thought it was a Simple Switch Loop

    Hopefully in Video and Pics I explain it better than here! I have a dilemma in my old house that I thought was a Simple Switch Loop but I have two hot wires in the ceiling receptacle and one hot in hallway light box! Here is my YouTube video, I have had a couple strokes and three heart attacks...
    • Madmankm
    • Thread
    • house issue loop newbie old old house screwfix simple switch thought wiring
    • Replies: 1
    • Forum: UK Electrical Forum
  18. N

    Fire Alarm- Earth Fault on Loop (XP95)

    Hello, Would welcome any advice- We have an earth fault to a fire alarm loop, everything connected is XP95 and there are isolators in many bases and call points.. Is there a hints/tips way to find this, without having to gain access everywhere. Would splitting the loop, powering the half that...
  19. mak

    Is there a max Zs for lighting circuits?

    I can't find anything related to this in the regs so I probably misunderstood the question. The way I see it the max Zs for any lighting circuit depends on the circuit breaker for that circuit. Say we have a lighting circuit with 100x36W ceiling lights which gives us a load of 16A, we choose the...
    • mak
    • Thread
    • circuit circuits confused earth fault impedance lighting loop loop impedance max radial types
    • Replies: 7
    • Forum: UK Electrical Forum
  20. C

    Earth loop testing in Europe

    Hi, I have a Martindale EZ165 and have used it previously to do basic earth loop test on sockets in the UK. I want to carry out the same operation in italy- it's a rural house on a TT system, I want to know if the approximate Zs reading is below 200 ohms and that the sockets are all correctly...

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