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  1. 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...
  2. 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...
  3. B

    Clamp meter and earth leakage tester

    How do you use clamp meter? Do you just clamp the line? Or line and neutral? Also been working with a couple of guys that have earth leakage meters and one clamps the line and neutral and the other clamps the earth? Can someone tell me the correct ways? Thanks
  4. 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...
  5. 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...
  6. F

    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


    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.
  8. 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...
  9. 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...
  10. A

    Minimizing leakage current

    Hi everyone, I have a problem in a home. By night time his rcd is tripping for no reason. I made and insulation test between neutral and earth + live and earth and got 4 mega ohms. I made a leakage current test and found he have 20mA. Can somone tell me how i can minimize it please...
  11. M

    Meter Accuracy - leakage

    Hi Guys Yes, me again, heres the scenario, customer calls in and they say the property is empty and there has been some units recorded on the meter, we install a check meter and shows the meter to be accurate. I have heard of electrical leakage, not sure if thats the right way to describe it...
  12. GBDamo

    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)
  13. stuarth

    Domestic USB sockets earth leakage question

    I have a customer who has been providing all the accessories for their renovation a real mix of manufacturers and styles, we arrived to second fix and swap existing faceplates to find that every single socket both single and double had usb ports. My question is will these USB ports all...
  14. P

    LED Flicker earth leakage problems

    Alright lads, new here as looking for some advice on a fault I've never come across and can't pinpoint.. Basically Got LED LIGHTS on compatible dimmers etc...problem I have is now and again they flicker....and I can hear a sound in fuse board as if there's an arc? But there are no loose...
  15. l4urence

    Leakage current meter - recommendations?

    I'm looking at buying something for measuring leakage current - The Megger DCM305e (I think). Not specifically for nuisance tripping but more for DC leakage current - type A vs AC RCD (type AC flooding with DC and not tripping). Not a lot of info on the DC side - except DC units for PV, I...
  16. naylorpd

    Domestic Find electrician to trace earth leakage

    OK, so this is a follow-on to my thread about unsatisfactory EICR. There is a big inconsistency in that the EICR reports all the L-E IR as >100 Megs, but the inspector also comments about earth leakage in two ring mans and one lighting circuit. This seems to be stopping me from replacing the...
  17. sjhall

    Megger DCM305E earth leakage clamp meter

    As above New in box £165 POSTED £160 collected No offers thanks Located in Formby Mersyside
  18. B

    Leakage meter usage/selection

    Hi. I have a question about earth leakage meter usage/selection. I see that people say one should test the live wires not the earth for reasons you guys probably understand. However earth leakage meters with large Jaws to loop around both tails are much more expensive. Can I use a combination...
  19. M

    Domestic Strange Earth Leakage Trips

    I have an odd situation in that I get random earth leakage trips which happen occasionally when I turn off an outside light. I have a standard split board, half earth leakage protected, half not. Trips happen maybe once every 50 times that outside light is switched off, never when it is...

    Earth Leakage Relay connection with normal CT

    Hi Can I connect normal Current Transformers (CT) instead of Core Balance Current Transformers (CBCT) to Earth Leakage Relay.. Thanks
  21. marconi


    I have spent some time reading into PV panels and inverters while trying to help with a current post on nuisance RCD tripping at a PV installation on a farm. I happened upon this technical paper which explains capacitive leakage currents from PV arrays and the trouble they could cause...
  22. 123

    Earth Leakage Clamp Meter...Why do I need one?

    I've read various threads on faults and it's been suggested that an Earth Leakage Clamp Meter is an essential bit of kit and some suggesting it is the first go to bit of kit in fault finding. What am I missing out on then? I do numerous call outs, and have yet to be beaten on one. What's it...
  23. Just4MeDad

    For Sale - Amprobe AC 50A Earth leakage clamp meter

    Excellent condition, full working order, manuals etc. Located in Chippenham, Wiltshire, PM any questions. Offers around £90.
  24. W

    TN-CS main bonding cable typical leakage current question.

    OK I'm prepared for the usual onslaught so here goes... I recently bought a clamp meter Uni-T UT210E. The first thing I did was check it out against my trusted AVOs and also a couple of other cheapo DMM's, (measure current through wire through probes and compare to clamp reading). The clamp is...
  25. Soulcraft Electric

    Recommendation required: Earth Leakage Clamp Meter

    Torn between the Fluke 368 (pricey) and the Megger DCM305E. Anyone have any preference/horror stories? Default is "Yellow" but the price is scary...
  26. Midwest

    Earth Leakage Clamp Meter

    Seems I've fallen foul of this poor quality product; Dilog dl6507 beware! - https://www.electriciansforums.co.uk/threads/dilog-dl6507-beware.101199/ And I was so cock sure here; Earth Leakage tester - https://www.electriciansforums.co.uk/threads/earth-leakage-tester.108917/ Mine was the CM...
  27. T

    Residual Current v Earth Leakage

    I think I must be missing the blindingly obvious, but..... TT system......100ma time delayed as main switch, then some final circuits (which will require 30ma RCD as includes sockets etc)...then 30ma RCD for other final circuits... Prior to changing CU at customer's request to include 100ma...
  28. nowaypedro

    Earth leakage - no load

    Called out today by new owners to a domestic 3 bed semi with history of nuisance RCD tripping from day 1 (lived there about a month). TNS. No dual supply. No regular pattern to tripping. Most appliances new. First - Ramp Tested RCD unit with no loads = 25mA (can live with that). Popped...
  29. Matthewd29

    Multifunction tester/ earth leakage tester

    Hi guys I have been looking at buying an earth leakage tester as it seems to be a useful piece of kit to have in my collection if anyone could recommend any which would be good quality? I am also using a borrowed mft as sadly mine kicked the bucket and I'm torn between megger and fluke if anyone...
  30. M

    Earth leakage tester

    Thinking of getting a earth leakage tester , any reviews of any you own would be appreciated (the cheaper the better ) .
  31. BigSpark

    Earth Leakage Tester

    Hi, im looking for a bit of advice on what kind of earth leakage meter i would need. I will be using it mostly for domestic work to help with any rcd tripping issues. Just seeing so many to choose from varing hugley in price depending on make and sensitivity, just dont want to splash out on...
  32. G

    RCD's and large capacitive loads

    Hi all, just registered today and sorry to come straight in with a request for help. I wasn't sure if this would be best in the commercial forum or the domestic one as really it is using comercial type equipment on a domestic ring main. I have 2 large battery charger/inverters in use at my...
  33. T

    Individual RCBO

    Hi I need to check what the electrical requirements (17th addition and Part P) are for RCBO's on a new kitchen extension. Using the existing house Consumer Unit with one 100Amp 30ma RCBO. Do all the different new kitchen circuits i.e Ring Main, Cookers (x2), Indiuction Hob, Lighting...
  34. charlie76

    Domestic RCD Random Tripping

    Evening all. Just after a bit of advice. Just been out on a job where they have had Random tripping of one of the RCD's on a split load board. They were told by a previous electrician it was the shower so that got replaced, problem continued. Another electrician said they had a cracked shower...
  35. W

    Induction hobs on rcbos

    Hi there customer got intemittant tripping of rcd on new induction hob , got service engineer out under warranty got told by a john lewis engineer that induction hobs need to only be wired on their own rcd/rcbo and not with other circuits like on a split load board 'All induction hobs need to...
  36. M

    Domestic Monthly intermittent fault

    I've been having this recurring problem where the RCD will trip (the MCBs don't move) causing power failure on everything in house. I can get everything (apart from sockets) to come back on immediately only if the MCB that controls the sockets is flicked down before I flick the RCD switch back...
  37. M

    Metrel MD9272 Leakage testing

    Hi, My new leakage tester arrived so I wanted to try it out, I connected it to the Line and Neutral meter tails and got a total leakage with all circuits on of 8.05 ma, I turned them all off and re-tested individually and found that the first floor ring final was giving the highest leakage of...
  38. L

    Domestic No so random RCD trupping

    This has been driving me crazy for a couple of years now, I keep thinking I've found the solution, then the problem resurfaces again - random tripping of my RCD. Without going into great depth, my RCD has been tripping on a regular basis at various times of the day with no one consistent...
  39. M

    Rcd tripping

    Quick question to all ive got and Rcd that trips out randomly through the day. Split board and the Rcd covers shower and sockets. With the shower breaker off an the other 4 socket breakers on, the Rcd will trip when u plug a tester in. However when u turn them all off a test each circuit...
  40. E

    RCD Problems with a twist

    Hi, I am having ongoing problems with Rcd in clients house. It is worth pointing out that I am living and working in Spain. The problem is continual nuisance trips when there is a power cut (there are loads when the weather is bad) the rcd is tripping when the power goes of,so it appears that it...
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