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neutral

  1. T

    Induced voltage on neutral wire

    Hi everyone, When checking my consumer unit voltages with the full board off, I stumbled across something head scratching. Measuring the feed from the DNO, L-N I read 242.3 V. Measuring L-E I measured 242.3 V and N-E I measured a steady 30 mV. When measuring the live side of the main of the...
  2. R

    Current flow in neutral but no voltage ?

    Having a challenge understanding the concept behind why when you measure across line and neutral (live circuit) using voltage indicators we have voltage reading of 230V single phase. If there is current flow in the neutral why is it termed as 0V ? On that basis, second question - If I tested...
  3. R

    most sockets show live neutral reverse

    just had a new meter fitted,tells me most sockets are faulty and not to use,all sockets apart from two show live neutral reverse. going to egypt for 2 weeks tomorrow,so can't get an electrician right now,must have been like this for years so assume it is still safe to use? any thoughts on the...
  4. 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
  5. T

    Lost Neutral on 3 Phase system - how do you calculate the effect on line voltage

    I know the effect of a lost neutral (floating neutral) on a 3 phase system, and the theory of why the line voltages can vary. However, I have been attempting to show this by calculating the line voltages of a phase system at given loads on each phase. Lets say:- Red 296 Amps, Yellow 279 Amps...
  6. rduna755

    Metal shielding and neutral , Monophase

    Hi I know its dangerous but if there is no grounding and if I connect metal sheet to neutral will it empty rfi hitting on it?
  7. H

    RCD without neutral 2 phase supply

    Hi everyone, Quick question can you fit an RCD without any neutral connections? If I have a 3 pole circuit breaker which has all 3 poles terminated with a 3 phase supply (L,L,L excluding neutral or earth) on the primary side and I am using only 2 phases on the secondary side (L,L) to create a...
  8. M

    Bolted neutral at BNO

    Good afternoon all, I have been asked to look at a problem with a bolted neutral but no one seems to know what exactly is the problem. SSE metering want to install new smart meters at a block of flats but have flagged that as it is a bolted neutral bar. SSE have said that this cannot be...
  9. M

    Neutral issue wiring a smart switch for heating

    Hi. I am trying to replace a heating timer with a smart switch. The current timer is the type with a dial on the front and 1 to 24 written on it where you pull out the little lugs to set what time the heating comes on and how long it runs for, APT is the make. The wires coming from the wall are...
  10. D

    Ground bar neutral bar connection

    I have breaker box at least 40 yrs old, both conduit and romex enter box, only one neutral bar that all white wires and bare ground wires attach to, bar has bond screw to box. Most everything I read and pictures on internet seem to contradict. Nowdays box must have separate neutral and ground...
  11. B

    Borrowed neutral on split load board

    I have a client with what appears to be an intermitent fault on the lighting, but trips the power. The installation has a 16th edition board with sockets on the RCD side, and lighting on the other side as usual. Occasionally when the landing light is switched the RCD trips on the socket side...
  12. Pastory

    WHY ISNT THERE A NEUTRAL WIRE IN THREE PHASE

    Why the main three phase doesnt have a neutral wire before reaching a stepdown transformer, how does electricity form a loop back to its source
  13. KelvinGaliny

    Can Live wire runs through the Neutral side of RCBO?

    So I had an inquiry to make an electric panel (single phase) with RCBO, but it seems like our customer uses type C and F power plug (I live in Indonesia). This plug doesn't have a guide to ensure the Neutral would always be in Neutral side & Live to always be in Live side. Can I still use RCBO...
  14. dcg4403

    480V 3PH Neutral Wire Sizing

    Greetings, I'm a EE and have installed many electrical systems but am now dealing with my first large 3PH install on our property. I'm not formally trained in this area but very familiar as a EE. Anyway, can someone help me with proper neutral wire sizing? I've done a bunch of research...
  15. phochief

    Wiring new hot tub using old hot tub wiring

    Replaced our old 240v hot tub with a new one, which also uses 240v for motors, heater, etc, and 120v for low amp LEDs and touch screen control panel. Right now there are just three 6 ga wires at the subpanel near the hot tub. 6 ga Black, Red and green. The old tub only needed the two hot...
  16. K

    ATEX Neutral connection

    I have a compressor to be hard wired into a zone 1 container. The container has a 3 phase + E supply but the compressor requires a 3 phase, N & E. This is not something I have experienced before within an ATEX installation and when researching there is a few discussions on TN-S, IT and TT...
  17. S

    Live & Neutral swapped on sockets?

    Hi Recently my son complained that he was getting shocks from his laptop when plugged into the mains in his room. I checked the socket and the others in his room and the wiring looked fine - red to live, black to neutral and firmly connected. I then used a plug-in Ring Main tester which...
  18. Pretty Mouth

    Open neutral in cooker

    A client has a Kenwood CK405 dual fuel range cooker, for which the smaller of the 2 ovens doesn't work. The elements tested out fine, but live tests showed that both N and L sides of the elements were at 230V to E, so presumably an open neutral. I'm guessing it's a loose connection somewhere...
  19. HappyHippyDad

    Can I confirm how to test for and how to find a borrowed neutral?

    During some testing I found a N-E IR fault on the kitchen lights of 0.1Mohms. I also found a N-E IR fault on the ring sockets, again 0.1Mohms. This could have been a coincidence, but I disconnected both neutrals from the neutral bar (i.e the kitchen lights and sockets) and tested between them...
  20. J

    Are these earth wires connected to neutral?

    I found a picture online of a standard UK connection in a block of flats. Where I have circled blue, would those earth clamps around the orange cable somehow cut into the neutral wire to connect within the orange sleeving? Or are they just clamped to the sleeve for some arbitrary reason?
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