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  1. M

    Earth plug burnt?

    Hey there im running an extension to my shop/shed heavy duty rated it powers 2x 400watt hallogens which i use in my chicken brooders There on a timer so they come on at normal day time and at night time it swaps to 2 red heatlamps. My bulb was making a whistle noise normally means replace it...
  2. C

    UK Changing plastic light switches to metal

    Hello! Complete novice here. I'm changing a plastic light switch to a metal one. There's a metal back box. I intend to run the earth cable from the wall into the back of the light switch faceplate. Then run another earth cable from the faceplate to the back box. Is it as simple as screwing in...
  3. R

    UK Twin and Earth in metal trunking

    Hi guys, I had to carry out some alterations to a domestic installation the other day and was pleasantly surprised when having to run a new circuit how neat the CU was. It had 75mm metal trunking installed to the CU with bass bushes installed. A lot of effort had gone in to it to keep it neat...
  4. M

    What should be the minimum resistance required between 3 phase and grounding (connecting wire to earth)

    Hi I am new to electrical engineering. I want to measure the 3 phase voltage near the water pumpset motors. I have connected phase lines to earth through a diode and six 1 mega ohm resistors (measuring the voltage across resistor). The same earthing wire is connected to ground in my dc circuit...
  5. K

    No earth in lighting

    Hi All, This is my first post and sorry if I am breaking any rules. My wife books an electrician to come in on Wednesday who was recommended to us, it was only to add some sockets in the living room, remove an old socket that was reminiscent of an EU plug (2 prongs) and move some light...
  6. M

    Armoured Cable seems to have no earth

    I have been helping my dad in the garage and we have an armoured cable with 4 wires. Red - Live Yellow - live via a switch Black - neutral Blue - is just taped at the end these were connected to an old garage consumer unit. There does not seem to be a earth wire? Testing with a light : Red...
  7. S

    Intex Spa - No earth wire in power cable?!?!

    Hi I have an intex inflatable spa and the moulded plug is hot to touch after running it for a few hours. I tried it in different sockets but it still gets hot so assume its the plug thats the issue. I cut the old plug off to attach a new one but there is only live and neutral wires. Is this...
  8. B

    Uk Lamps

    Hi, I recently bought 2 lamps from eBay, when they arrived they had European plugs, when rewiring the plugs to UK plugs I noticed the wiring is only 2 gauge and has no earth. This concerns me as the casing for the lamp is made from eBay appears to be metal/ brass! Also there is a what looks to...
  9. Zdb

    Computer earth leakage value (mA)

    I know every computer/equipment type will have a slighty different earth leakage stated by the manufacturer, however I was wondering what people use as a "rule of thumb" value when designing ring final circuits in offices intended to be used for computers. I was thinking 1.5mA per computer inc...
  10. P

    UK Cooker hood

    I've got a cooker hood extractor, it only has a live and neutral cable, I've only got a single socket to install it. Can I put a 13A plug on the end of it?
  11. J

    Earth bonding metal balcony

    Last year I had a large cast-iron balcony constructed with steps down into my garden. The balcony is bolted into the walls and also into the pavement where it meets the garden. Is there a requirement to earth this? If so, should it be a separate 10mm CPC direct to the CU or could I link it to...
  12. L

    UK 3 phase supply earth concern

    Hi all, Background- I rent commercial premises for a small cabinetmaking business. Lots of 3 phase machines and 240v circuits. The site is on a farm where the main supply enters the landlords unit to a distribution board where it is then split to various rented units. That board looks like...
  13. W

    New Zealand should i earth my steel garage work bench to the power point next to the bench.The bench is constructed of timber but has a solid steel top,cheers

    Should i earth my garage steel bench top,it is constructed of timber but has a 3mm steel top,
  14. D

    E39 530i touring - Nav fuse stray voltage on earth side - battery drain

    I have recently traced what I think is probably causing my battery drain to fuse 56 in the boot of my touring which is one of the navigation fuses. I thought could just pull the fuse to stop the drain as I never use the sat nav anyway but its had some other consequences. When I pull the fuse...
  15. Mike Johnson

    Earth terminal block

    Does anyone know where I can get an earth terminal block like this in the UK: https://www.leroymerlin.fr/v3/p/produits/repartiteur-de-terre-p-40-mm-michaud-e1401450424
  16. J

    Zs values and 50v

    Hi all I’m doing some work on my NVQ and came across this on the internet. Can someone explain this picture to me and if it is correct.
  17. B

    UK EV Charger Earth Rod

    I have completed the 2919 course and was told during this that all chargers would require a TT connection, whether solely for the charger or as part of the full installation. Since completing the course a while ago now, I have discussed with some electricians who say they don't install an earth...
  18. A

    Minimum earth for tncs

    Hi all, need some help as I'm having a blank. Replacing a consumer unit on a tncs that currently has a run of 2.5 metre tails 16mm tails and 10mm earth. I don't want to waste money for no reason replacing them if not necessary, I know a lot of people would fit 25mm and 16mm earth but the supply...
  19. A

    tips for making earth electrode

    dear electricians, I am going to install 2 earth electrodes for a block of 4 apartments. can you please give me some tips on how to drill the hole for it and what diameter and length the hole shall be . also if you know any other tips that might help my installation please let me know. some...
  20. A

    Swa earth nuts

    Hi all, has anyone used these and are they worth it? Quite expensive but if they save time. I have a 2.5 swa run 50m down a garden to feed a socket, light and roller gate. I'm think of using these where I come in and out of the plastic socket amd plastic enclosures to bridge instead of...
  21. M

    UK Earthing a V2G Electric Car Charger with a earth rod

    Hi I am new to the forum and looking for some advice. I was supposed to have a vehicle to grid car charger installed last week. But they couldnt get a suitable earth from the earth rod. The earth rod reasing was 384 ohms. They're saying I need a marconite pit. the reading has to be below 100...
  22. D

    Ring, Radial and Earth

    Hey guys! Hope some of you can help me out quickly! So I've got incoming PV and battery supply of 2000W at roughly 8.7A. This is through an RCBO and to a RCCB 30mA garage style consumer unit, just with a 16a and 6a MCB. The 16A serves 5 sets of double sockets with about 15M of 2.5mm. 1st...
  23. M

    Do I need to earth this? (UK)

    Hi all DIY-er here :) I have this lamp. It's old. Early 20th century I think... I need to rewire it and put in a new bulb socket if I want to use it AND keep my house safe! Obviously currently there's no earth. But it being metal and me being in the UK I need advice on how to rewire this...
  24. A

    No earth tncs

    Hi all, I am just looking for some advice or whether I am possibly missing something here. After isolating the supply and taking the cover off an Wylex consumer unit, there is no direct earth from the DNO cut-out to the board, and is only one 6mm bonding cable connected on the MET which is a...
  25. 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...
  26. 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
  27. M

    Max Earth Fault Loop Impedance for OverCurrent Devices Before Amendment 3 and Now???

    Maximum Earth Fault Loop Impedance for OverCurrent Device was calculated 230/(MCB Rating*5) * Rule of Thumb is that correct? And how are they worked out now after Amendment 3?
  28. Pete999

    7/029 uninsulated earth wire

    Anyone got any memories ( for the Oldies amongst us) of running uninsulated earth wire, and trying to make it look presentable using those insulated staples that had to be used?
  29. B

    Would an earth rod be beneficial

    Hi Everyone, I have a steel framed shed and noticed it uses the earth from the house via a 10mm 5 core cable. I cant see anywhere where the shed frame is physically earthed, the earth wire in the five core cable goes to the distribution panel in the shed. Should the earth wire also go to the...
  30. I

    Swapping plastic faceplates to metal

    I’m looking to swap the plastic switches & sockets in our house to metal. Ive removed the plastic faceplate, and can see that there are a couple of earth wires in the back box, which terminate into a choc box. I assume the builders left them like this in the event people swapped to metal like...
  31. E

    Earth Leakage in Processing Plant

    Hi Guys, Have a problem with a Omron Switch mode power supply & Omron Control Relay Which is only switching a 3phase mixer paddle to stir liquid while in the heating process. The control gear is fed from a single phase supply plugged into a RCD protected socket. The Rcd trips within 9ms @ X1. I...
  32. 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...
  33. D

    UK Static/Tingle from shower/towel rad.

    Hi, working in a property a couple of years old. Earthing System is a TN-C-S. Customer’s daughter/wife have both complained about receiving a “slight tingle/static sensation” when using the shower in only one of the bathrooms (when touching the shower/or towel rad). I’ve checked the incoming...
  34. Baddegg

    No Ze through main earth?...

    Testing Ze (TNs) prior to fitting a small 2 way unit for a kitchen....disconnected main earth and my tester is flashing telling me polarity is wrong ( it’s not polarity as I can confirm that visually) so I reconnect the main earth and test straight to the external MET and get a reading.....so...
  35. M

    Earth fault on a TN-S system

    So here is the situation 22kV/415V delta-star transformer with neutral point earthed on secondary Downstream breaker of transformer 630A with earth fault setting 0.2xIn @ 100ms This supplues a number of outgoing loads with respective 50A breakers which only have thermal and magnetic settings. An...
  36. T

    How would you do earth continuity on ring circuit in two core MICC cable?

    How would you do earth continuity on ring circuit in two core MICC cable?
  37. B

    Earth readings

    TT system Ze is 17.5 ohms but when connected it is 0.60 ohms? Have one outgoing 95mm SWA and one 240mm SWA earthed either end and individual rods? Thanks
  38. Zdb

    Twin & Earth CCC

    I've got a RFC that I need to split into two 20A radials. I've looked in the BBB but it doesn't state the current carrying capacity of twin and earth in surface mounted trunking (reference method B). I've had a little look online and I think that it might be 23A (before taking other derating...
  39. C

    Earth Rods in TN-C-S and TN-S

    Why aren't earth rods required on a TN-C-S or TN-S supply? In the US earth rods are mandatory for both. Two earth rods if the first one is over 25 ohms. Here is how its typically done: View: https://youtu.be/4vxYXzNtE9A?t=3459 #6 copper (13.3mm2) is run from the neutral bar of the first...
  40. HandsOffEngineer

    Should I earth bond test Class I appliances?

    Hello, I am a Trainee here on the Forum. I am seeking some further advice/input on a specific technical matter of importance to me. Briefly, I have completed C&G level 1 in electrical installation (distinction) and I am currently on the level 2 course, and things are going well on that score...
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