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  1. E

    LED lightstrip earth

    Hi, I've got an Innr 4m light strip I'm running up my stairs, I bought an aluminium diffuser to run it in but I'm getting a very slight buzz/vibration on the aluminium when I run my fingertip along it like it's not earthed (no shocks or tingling). The light has 1 of those thin 2 core power...
  2. S

    Mr Nagy,s earth rod video.

    Just wondered if anyone has used this method with the earth wire in flexi conduit going to a plastic end box flat on the pavement outside the front door with the earth rod coming up thro centre of the box. Looks like a trip hazard to me. Regards,S
  3. S

    UK Should I get the main earth changed by the DNO?

    I have been asked to upgrade a fuse board, however, when I did an initial visual inspection, I noticed the main earth from the DNO is unsheathed (TN-S), it’s strands that are clearly ancient! I haven’t yet carried out any tests. Should I get the DNO to change the earth? Will they actually bother...
  4. P

    No earth or neutral

    Went to customers house yesterday (TT System) with a reported loss of power to the outbuilding. Checked the main consumer unit & the mcb was off, so flicked it back on, plugged in the megger & it showed 230v. But when I tried the lights or plugged in the Strimmer nothing happened, when tested I...
  5. J

    din rail mounted bell transformer - earth?

    hi i've bought a hager st303 din rail mounted door bell transformer and a 2 module wylex ESE2 enclosure for it to fit in. i was going to run this off a 3A FCU. i can't see any earth connection on the transformer from the photo - it haasn't arrived yet - and there's nothing to earth in the...
  6. S

    Earth wire loose under sink - advice

    Hopefully a very quick question. Whilst looking under my sink this morning I noticed the Earth wire between the hot and cold pipes is no longer connected. I can't recall if it ever has been but I'm assuming this has come loose and I should reconnect it? If I do connect it should I take any...
  7. B

    Broken CPC on Lighting Circuit

    First time posting so hope this is correct place? Been checking out a Customers Premises and all is good apart from 1 lighting circuit that feeds a bedroom and office. A CPC has been run but has been damaged/broken/cut somewhere en route to first light switch. (proved by using wander lead)...
  8. T

    Earth size for TT

    Got chatting to another electrician today who said about using 16mm earth for TT. Not that i have ever had to put steak in but am i right in saying its 10mm for a TT system?
  9. D

    3 core & earth to 2 core & earth

    Hi there. After a bit of advice please. Only reason I am not getting an electrician in is because my son is struggling with Asperger's at the moment, so just not able to let contractors in as he has meltdowns. I am in the process of simply replacing an old light from underneath a stairwell. I...
  10. A

    Commercial Fridge tripping

    Hi My name is Allen Brauteseth from Cape Town South Africa. I am a Qualified electrician and am sitting with a problem being I have a commercial fridge for cold drinks that trips out the earth leakage after running for 10 minutes please could someone help me as the supplier says there isn't...
  11. TonyMitchell

    High Earth current flowing

    I have measured high currents in the CPCs of four circuits as shown in the table below. This is the case both with the circuits energised and isolated. Removing the CPCs for these four circuits brings the current in the MET to DNO cut-out, back to genuine L+N measured leakage levels. However...
  12. W

    Earth Rod Connectors

    ok, so stupid question. its been a while since i have used any earth rods, and the first time since i was an apprentice that its for a tt system and not an earth ref for a generator. So iv got my rods in, and im going to connect it up but i have split the connector, two of them in-fact, i...
  13. Paignton pete

    Earth rod fluid

    Some where on this forum a while ago someone mentioned poring a special fluid (not urine) or resin down a hole by earth rod to improve surface area connection to the mass of earth in high resistance areas. What is this fluid/ resin called. I need to earth a new supply on. Very stoney, shale...
  14. Maxine

    Domestic Earth bonding for meters

    Hi, I am just after some advice. I am having new meters fitted and been told they need to be earth bonded? I've attached a photo as my friend thinks this has been done but I need to know before I book an electrician, so any help is appreciated, thank you
  15. T

    Domestic How to locate earth leakage wiring fault [Home wiring].

    Hello Everyone, I am from India. Things were good [seemed to be good] with temporary electric connection [single phase, 230v] to our new house. Now when we are organizing electrical wiring, dividing phases, installing ELCB, the problem started occuring. Now the electricity connection is of 3...
  16. happyhippydad

    Why the need for an earth spike test kit?

    I am about to put in a copper rod to TT a garage. I have a megger 1731 but do not have the Earth spike test kit. I will be able to test the Ze once the rod is in place and wondered what the difference is between testing the Ze and testing the Ra with a spike test kit? Is it sufficient to just...
  17. Sparksaflyin

    Dual board with no earth on final circuits

    Hi guys. Need to change the fuseboard at my parents house but none of their final circuits have a cpc run to them. Obviously have an earth on the main incoming so I can get a 16mm earthing conductor up to my new 18th edition metallic consumer unit but they don’t want a rewire so none of the...
  18. happyhippydad

    A question about how current travels through the real earth?

    When testing Ze on a TT the only connection between the line and the earth rod is the actual ground. When you do a Ze is it actually sending a small current through the actual ground from the earth rod at the house to the earth rod at the transformer? Also, related to the above, I have 2...
  19. C

    6mm earth tn-s question

    Hello guys After doing the adiabatic the 6mm will be fine as the main earth on a tn-s 60a 16mm tail fuse board. Is there any reason past the Calc this may not be ok as running a new earth may be tricky
  20. P

    Earth fault on water pump

    Alright folks, First time poster but im at my wits end! Got a mobile welfare unit which has a small 3kw hand wash in it. The water to the hand wash is fed from a small pump which comes on when the sensor for the hand wash is activated. There is a flying earth lead from the pump which is now...
  21. B

    Joining 16 or 25mm Earth Cable

    Hi any recomendations for products which I can use to join Two 16mm Earth cables. Going in a Fairly inaccesable place so trying to avoid Screw based products. Need to move an bonding cable for Copper pipe as boiler been relocated
  22. R

    Single core and earth lighting fault

    Could the better and wiser assist with an odd one...? I've just finished a big CU swap on a 1950's house that uses single core & earth lighting circuits. All but one of these are fine, but the faulty one is pretty funky; There are 3 accessories on this circuit in 3 separate rooms. The first...

    RCBO with Functional Earth Lead.

    I have read somewhere, (but I can't locate the source), that because the RCBO's electronic control operates at a very slightly higher potential than earth, there is a very small leakage to earth through the functional earth lead. Is this correct or is my memory playing tricks?
  24. A

    Main earth sizing

    Hi guys, Just wondering if anyone can clear up an issue. On tncs earthing systems, can you calculate the size of the main earth? I thought you could but main bonding conductors have to be sized to the neutral. Just had a conversation with another electrician and he said it has to be 16mm for...
  25. Farmelectrics

    earth leakage

    got a new toy ha ha clamped my new earth leakage clamp around my earth cable local to consumer and was getting 5mili amp leakage question what mainly causes the earth leakage other than computers fridges etc
  26. C

    Shortening Extension Cords / No Earth Wire On lamp? Advice Needed

    Hi there, I have been shortening some leads around my house so they look a bit nicer and tidier. I am about to to the same to my lamp cable but i notice it has no earth. Is it still OK for me to cut the cable and re wire the plug? Also why doesn't this one have an earth? Thank You.
  27. C

    Earth rod installation services below

    Hello guys I have a job coming up where i will be installing x2 car chargers in an office car park (wall pods) supplied from a PME. When installing earth rods what procedures can anyone recommend to ensure you do not go through any services below? Site drawings would be ideal however they are...
  28. D

    Zs reading with main earth disconnected

    Morning, just checking a lighting circuit on a house, I have the main earth disconnected and still get a zs reading of 2.2 ohms. No evidence of an earth spike and bonding goes direct to henley block. Any suggestions why this could happen??
  29. happyhippydad

    Cable size and how to earth this system?

    Morning.... I have a friend of a friend who is just looking for some advice regarding his 12V solar set up. It's a metal shed approx 5m x 3m. My 2 questions are: 1. Does the cable joining each of the 5 batteries have to be 50mm as well as the cable from battery to 3kW inverter? I'm sure it...


    I am looking at buying an earth leakage clamp meter AMECaL ST-9810 (£59) or a Megger DCM305E (on offer at £194). The only use will be mainly domestic fault finding. Any opinions will be most welcome.
  31. F

    Earth leakage High.

    Hi All, I had a nuisance rcd tripping fault at a job , I bought a Megger DCM305E earth leakage clamp, which identified the suspect circuit which I swapped out with an RCBO and problem solved! Ive come home and checked my L-N incomings just to see and I’m showing a 513MA leakage? My board...
  32. Bobby34

    Good mid range earth leakage clamp meter

    Could anybody reccommend a good earth leakage clamp meter, specifically one that measures low mA's to find any small earth leakage current that may cause nuisance tripping? Megger is my usual go to but don't want to fork out more than around the £100 mark if I'm able to get something pretty...
  33. D

    Domestic Gas meter earth bonding

    When running the 10mm Main Protective bonding to the Gas in a semi recessed gas meter box, how do you enter the box with the cable? The reason I am asking is: 1) The pipe sleeve for the gas pipe can not contain the earth as it is not 25mm separation. (yes I know it will attach to the pipe...
  34. Marcus Vaughan

    BS951 Bonding Clamp on the Incoming Supply

    Hi all, Just been to look at a job for a consumer unit changeout, checked the supply and, Not sure you can see it too well but TNS system with older earthing conductor in green kind of sweated onto intake (connection does not feel too good), but disconnected at the other end (goes into that...
  35. T

    Enclosure used as earth

    Hi all, question regarding earthing in hazardous areas distribution panels. The issue is that on most equipment in hazardous areas they use the metal of the enclosure as the earth so if a threaded entry and metal enclosure no need for internal earth cable, like wise if going through a clearance...
  36. James the Spark1976

    Commercial Lets Talk about Large Earth Currents

    I have a customer who called me in to look at a small electrical fire. They are a welding and fabrication company and have several welders operating on site. The circuit pointed out to me that had been on fire was a 3 phase 16A supply for a floor mounted crane. the crane is able to rotate on a...
  37. S

    electrician needed for earth testing

    I'm moving into a property in thornley county Durham i need an electrician to first do an earth resistance check and then check other electrics as time goes by as I'm putting in a new kitchen and other items rough price for someone to come out and check and give further advice.
  38. G

    Earth leakage clamp meter

    Anyone got one they recommend. Looking to spend upto £120. Would like micro Amp resolution if possible single digit milli Amp a must. Ta muchly. Edit: only looking at testing appliances and 240V circuits. (did a search but no conclusive answers found)
  39. Andy C

    Domestic TT earth, Dual RCD or RCBO and Main Switch

    I have a replacement consumer unit coming upon which is currently off a TT system with a nice low reading on the earth. There is no chance of the DNO converting to TNCS. No SPD or AFDD as per client. I intend fitting a new Dual RCD consumer unit. I have researched this site and there was talk...
  40. M

    Advice needed on unconnected earth wire.

    Hi all. Apologies of this is in the wrong place. I am looking for some advice. I had a new consumer unit in 2016 which is fine however I have just noticed an earth wire coming out of the bottom which isn't connected. I'm not sure if I has always been this way or not? There is another earth...

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