loop

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  1. D

    Adding downlights and keeping the existing pendant - Loop Outs

    Hi all, DIY'er here looking for a bit of advice so please go easy on me. In my dining room there is an existing single pendant and i would like to add 4x downlights. I have looked at the wiring behind the ceiling plate and it is the usual, (Switch Line) (Loop Out x3) (Loop In) the 3x Loop Outs...
  2. S

    UK Amtech/Trimble - Excessive Earth Loop Impedance on SWA cables

    Hi All, I'm new to Amtech/Trimble and I've been asked to review a model. I'm looking at circuits that are SWA cables using the armour and an internal conductor as the CPC. There are various earth loop impedance errors listed where the Zs at the load end is too high, but what I can tell, Amtech...
    • Steve W
    • Thread
    • cables cpc earth earth fault loop impedance impedance loop loop impedance swa
    • Replies: 4
    • Forum: UK Electrical Forum
  3. H

    Loop impedance calculation

    Hi all , The measured value of loop impedance for a circuit is 2.4Ω. If the temperature at the time of the test was 20°C and the cable is 70°C (factor 1.2) what is the corrected value. Ze = 0.4Ω: the answer that I got is 2.8 but according to my calculations it would be 2.88 ohms follow up my...
  4. stemill

    Loop test fail on lighting circuit.

    I'm moving a socket installed on a lighting circuit (installed by previous owner who was a professional electrician so I assume he knew what he was doing). The socket is used only used for a lamp which is controlled by a wall switch. I've installed new/moved sockets previously and always check...
  5. timhoward

    MCB trip (not RCD) during loop test

    I just finished a garden room supply. The customer already had a CPN garage consumer unit that the last sparks left there, brand new in box, and with some misgivings I agreed to use it. It came to testing. Zs@DB of 0.3 ohms in garden room. CPN RCD main switch tripped x1 at 21ms The lighting...
  6. N

    3-Way Switch Loop, Ceiling Fed Multi-fixture Wiring Puzzle - Need Help

    This weekend I was replacing a hall light fixture in my old home (rewired circa 1980/90's) and noticed the work was done using one of the exposed ground wires as one of the switch leg/loop travelers on a 3-way. Obviously, this is completely wrong and a fire hazard, so I decided to try to rework...
  7. Lainan01

    How does fault current loop? "Earth Fault Loop"

    Confused as to what the earth fault loop is. I'm aware it's the path that fault current takes (Line-Earth) but how many times does fault current "loop"?
  8. A

    Diagnosing overcurrent error on VFD

    I have a box powering three 3-phase motors off of one 240V single phase line, NEMA 10-30. In the picture you can see a wiring diagram. The original wiring I had was one box containing all those components. It would cause over-current errors on the right-side (1 HP) VFD when I didn't have fuses...
  9. F

    Shelly Connection and Full Switch Loop

    Have a bunch of home automation in place, and am considering installation of a Shelly into a light switch to remotely control some lights. Looking at the current switch configuration, it should all be pretty straight forward. Have a two gang switch, one light switch (left in the pic), controls...
  10. T

    Adding a light to loop at switch and change to 2 gang switch

    Hi, I am wanting to add a couple of wall lights to a room that currently has a single ceiling rose. Attached are photos of the one gang switch and the ceiling rose. I wish to change the one gang switch for a two gang switch, so that one switch operates the current ceiling rose while the other...
  11. Aaron b

    What in this old service head?

    I had a look at a property with this old service head. It's a looped supply, the met is just a bolt and the tn-s earth is questionable. There's also a knockout missing on the side. I'll recommend the DNA are contacted to look it over. I was wondering what the insides are like? If there's a...
  12. D

    Smart switch loop issue

    Hi DIYer here. I replaced a one gang switch with a no neutral smart switch. I put the provided capacitor between live and neutral in the ceiling rose. All seems fine except that occasionally the light flashes when one of the other switches on the loop is switched on. Is there anything I can do...
  13. D

    Loop Impendance question

    Hi, I am currently studying to become an electrician and keep seeing this question (normally different values) and I am not sure how to work this out. Would someone be able to let me know how you work this out? The measured value of loop impedance for a circuit is 2.4Ω. If the temperature at...
  14. H

    What’s the point of earth loop if your rcd performs ?

    Hi guys was having a conversation as a apprentice I’m still not sure and was wondering why earth fault loop impedance is important if you’ve proved your earth because the rcd trips proving your rcd performs ? Can anyone tell me thanks so what my question is in short what’s the point of it if...
  15. C

    Fire alarm loop testing

    Hi all Just a quick one. For a fire alarm loop addressable system. Fp200 1.5mm cpc 1.5mm To obtain R1+R2 would you treat the "loop" as a radial in effect and link brown and earth in connector then tester on other leg. Or would you treat it as a ring and figure of eight and can be tested...
  16. J

    How add lighting spur? Nuteral is loop at the fitting and live is looped at the switch.

    How is addtionl light spur added spur in the following situation? Nuteral is looped at the fitting and live is looped at the switch. Theres two netural and one switched live at the light fitting, with all live and switched live at the switch.
  17. 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...
  18. 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...
  19. 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...
  20. 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'.

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