neutral

  1. I

    Borrowed neutral / RCD trips but circuits still live ?!

    I’m just a homeowner, so please forgive me if my question sounds stupid .... i think the lights in the hall of my small bungalow are using a borrowed neutral. I recently went to fit a new light on the ceiling in the hall using the existing connections and turned off the MCB that said “Hall...
  2. W

    Connecting 2 neutral wires is tripping out

    Hi guys, I posted in here the other week and thought I'd figured out my mistake but now I've landed with another problem. I'm trying to replace 2 walls lights - like for like - the 2 lights are powered by a double switch in our living room. One switch controls 2 lights on one half of the room...
  3. L

    There is a one circuit (one voltage source), two phases and

    Hello Electricians, This is my first post and I'm glad to be one of this forum member. However, to clarify my question. I've a "Skin Effect Heating System", fed by 1240 V. The circuit is quit simple, Phase U, Neutral in the middle and Phase V. Phase U and Neutral feeding the heating cable#1...
  4. P

    Floating neutral and UPS

    Here is my dilemma. Picture this arrangement: a system with a 100A three-phase supply will have a RCD incomer (and possible some generator transfer switch in the future). As well as the SWA supply cable's earth there will also be some lightning protection so a few earth rods as well. From the...
  5. M

    Identifying a neutral supply problem?

    Had a call today. Property has 400v 3 phase DB....it used to be old commercial unit but changed to residential. He's been in process of moving in but within day or two appliances starting to burn out. He's father had reported testing some sockets and voltages varied at times when other...
  6. C

    Blown Socket- Possible neutral earth issue

    Hi Members, This is my first post, I live in South Africa with similar domestic DB set-up as UK & Australia. Yesterday, we had a kettle blow the receiver socket in the kitchen and this tripped the earth leakage switch, I am trying to see if I can fix this, I have sa fair degree of knowledge...
  7. M

    What are the implications of a failed Neutral - Earth insulation resistance test?

    Greetings! Newbie here! We have 3 phase installation in our Lighting dimmer rack. During Insulation Resistance testing on Earth-Nuetral, readings was 0.33Mohm on 500v test. What causede the failed test and how can I troubleshoot? Thank you! Markus
    • markusjames
    • Thread
    • earth failed insulation insulation resistance insulation resistance test neutral resistance test
    • Replies: 20
    • Forum: UK Electrical Forum
  8. O

    Wiring Mishap - Wondering How Much I Destroyed…

    I'm a DIY kind of guy, and was never really fond of household 120V/240V power before, until I had a friend who used to be a journeyman help me understand enough to wire up my house we are completely renovating. So, after putting some walls and trusses in place, and running conduit all day...
    • Outtaluck
    • Thread
    • fried ground main breaker neutral parallel short circuit sparks wiring wondering
    • Replies: 12
    • Forum: USA Electrical Forum
  9. Mark Wright

    Short Circuit Line to Neutral where does the current go after the consumer unit?

    Short Circuit Line to Neutral where does the Current go after the consumer Unit? I assume it goes back to the Sub-Station where it is earthed but i'm trying to find this written in a official book etc but finding nothing. Thanks
  10. N

    277 Volt lighting. Y system. I have a string of lights out in a hallway.

    277 volt Y system lighting circuit. A string of lights out in a hallway. Have 277 to ground on both my hot and my neutral. Have only 15 volts between my 277 hot and 277 neutral. This was discovered Friday afternoon, Co. does not pay OT so its my unwanted challenge for Monday. Will look at prints...
    • NKH Kris
    • Thread
    • ground lighting lights neutral out screwfix string system volt wire
    • Replies: 1
    • Forum: UK Electrical Forum
  11. L

    Neutral reading 1.8 V

    If I am reading 1.8v on a neutral is that acceptable. Reading on a 3phase 277v lighting neutral. Thanks
  12. I

    Use of Singles for Main Earth Conductor and Incoming Neutral?

    Hi folks, Limited experience here and never come across this before. Whilst I can appreciate the conductors may be the appropriate CSA combined, (I haven't measured them) terminating the Main Earth Conductor in the MET like this with what looks like 4 x 4mm2 doesn't allow for the conductors to...
  13. I

    Need to understand the neutral conductor

    Appreciate there are a lot or questions about this already but I just can't seem to grasp it so hopefully asking the question in my way will help. Background: UK 240v AC domestic system. As I understand it, if everything is wired correctly and there are no faults, I can touch the neutral...
  14. KeenPensioner

    Borrowed neutral - again!

    As I've said before, I'm not a qualified electrician but have worked as a mate a few times. I'm retired now and as a hobby I study all things electrical (domestic). I know this has been asked before on this forum but as an amateur I still can't understand how the wiring for "borrowed neutrals"...
  15. Iain Stewart

    Can I bridge Neutral Busbars in a CU

    Hello, Old Merlin Gerin CU with one RCD in the middle. Can I bridge accross the Neutral Busbars in the CU to make all the circuits RCD protected. Thanks
  16. I

    No neutral smart switch, faulty?

    Hi, I've just purchased a 2 gang no neutral smart switch, however I was sent 3 gang. I thought i'd use it anyway. When i connected the common(S) to "L" & Switch live "L1" & "L3", nothing happened, switch didn't light up, lights didn't come on. My current switch operates 2x lots of led down...
  17. O

    No neutral wire for smart switch?

    Hi all, first post here, let’s go. So I’m installing a smart switch in my kitchen and after pulling the existing switch out I noticed that there are only two cables in the wall box. Each of the two goes to the switch with a simple straight connection. I’m assuming that these are both live...
    • Opatry
    • Thread
    • neutral neutral wire smart smart switch switch wire
    • Replies: 4
    • Forum: Lighting Forum
  18. C

    Earthing neutral in a multi source system

    This has me clueless. Why must the neutral be unearthed at the transformer and generator and only allowed earthing at the switch-gear? I can't see any reason because the neutral will normally not be carrying any current and thus no parallel current paths would form.
  19. J

    Smart Lightss - Moving a neutral, IFTT

    Thinking of going the following & wondering if there is any reason why I shouldn't I live in a UK House with the Lighting wired as loop in/out at ceiling rose & then a twin and earth taking a permanent line to switches & bringing a switch-live back (over the blue cable - marked with brown...
  20. B

    Updating 1982 Pre-fab building with fuses & no grounding

    Hello, I have a flat/apartment in a building as described in the subject. I am wondering what to do about the current and additional outlets to have them be safe for kids. The options: -Replace fuse box with circuit breakers -Run ground wiring and connect it to neutral at the junction boxes...
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