loop

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  1. C

    Can you add a second fixture to a switch loop?

    I currently have a light fixture on a switch loop and would like to add a second light that would be powered by the same switch. Can you add a second fixture? Forgive my novice picture, but if so, is this an allowable setup?
  2. andy_baz

    DIY - Looking for advice on a re-connecting a ceiling rose loop

    Looking for advice on how to re-connect a ceiling rose loop connector. I am trying to achieve room 1 and room 2 lights to be independently on and off. This previously worked until i decided to try and change the fitting without taking a photo of the wires as they were when working. Yes i know...
  3. alisonlcraig

    Electrical loop removal - help!

    I moved into a house that had a double gang switch downstairs that controlled a downstairs and upstairs hallway lights. You could turn the upstairs one on from downstairs and off upstairs etc. The downstairs hallway light was just controlled by the downstairs switch. I want to disconnect any...
  4. sythai

    Secondary loop pump + pipe stat

    Hi Guys Recently finished a new build house. Commissioning engineer came in the other day (2nd visit whilst I wasn't there) and mentioned we need to put a pipe stat on the secondary loop pump. We've only ever wired these as on/ off time controlled. Apparently it's regs (heating engineer we...
  5. I

    Loop into Fan

    Hi all new to the forum Learning the trade as an improver, trying to get my head round something. When taking a feed from the light switch to the fan. Normally I would P live in Com and SL in L1 So had to attach a three core then up to fan, so does permanent stay in Com or go down to L1...
  6. 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...
  7. 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
  8. M

    G99-SGI-3 4.4 kw set export limit phase to neutral loop impedance test on site

    G99 SGI-3 4.4 kw set export limit phase to neutral loop impedance test on site 0.309 ohms and dno max being 180 m ohms or 0.018 ohms so site reading are well over the top or is this not unuall for 1950 lead cable TN-s
  9. 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...
  10. 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...
  11. 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...
  12. 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...
    • NNMark
    • Thread
    • 3-way 3-way switch ceiling help loop need help switch wiring
    • Replies: 1
    • Forum: UK Electrical Forum
  13. 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"?
  14. 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...
  15. 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...
  16. D

    Loop impedance and equipment cables

    Two related questions in 1, if anyone is up for helping! (i) When electricians install supplies, is there anything in the regs that says how many milliohms they need to include for equipment cables? I have been told "no", that the loop impedance is only up to the outlet. Now I am an R&D engineer...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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