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  1. 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??
  2. 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.
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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.
  11. 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)
  12. 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...
  13. 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...
  14. M

    Domestic How to safely cap earth wire for a ceiling light

    Hi I've just bought a new ceiling light for the bathroom which does not need an earth connection. Unhelpfully, the light fitting makes no provision to safely terminate the earth wire coming from the electrics; see pic: This leaves me with the dilemma of what to do with the earth wire coming...
  15. M

    Domestic No Earth in light circuit

    Hi, I have an looking to replace some plastic surface switches and I have noticed that there is no earth wire. So I don't think I am going to be able to any metal fixings. What are my options. Just leave it as it is. Look to get the circuit re-wired. Thanks
  16. C

    Bus duct - Earth cable Size

    Bus duct is used to transmit the power from the secondary of the transformer to the Main distribution board? If the cable is used instead of bus duct, we would size the ground cable approximately half the cross section area of the power cables according BS 7671 table. 54.7 If this is a bus...
  17. C

    Neutral - Earth link in Main Switchboard

    When is an earth neutral link required in an main switchboard? Is it particular to the earthing system? Is it common to earth the source neutral at the first point in the LV system where the neutral is terminated - the main LV switchboard. If the Neutral terminal of the transformer is...
  18. M

    Industrial Excessive earth fault loop impedance

    I work for a hotel chain and recently we’ve had our 5 yearly test they have 8 circuits from our LV panel with excessive loop impedance readings !! So apart from either introducing an rcd or dropping mcb ratings or type is there any other way of achieving satisfactory readings ?? Also if I have a...
  19. Gavin John Hyde

    Condudisc alternative to a earth rod

    Been having problems of late with hard rocky ground making installing rods on EV chargers next to impossible. This thread might also be of use to people when putting rods in when exporting PME with tricky ground conditions too. Have come across this Looks quite useful. anybody actually used...
  20. G

    Earth connections into new controller board

    Hi All, I have 3 separate Earth wires connected into an existing controller board. These 3 wires all have ring terminals and were hooked to a single brass earth bolt connector on the board. Now, As I'm replacing this board, I realised the new replacement board only has one Earth screw terminal...
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