Posting a message to the forum will remove the above advertisement
  1. angel While you're here, would you mind checking out our Electrician's Insurance section to see if we could save you a few quid? - Specifically our Van Insurance Deals and Public Liability Insurance Deals. Thanks for supporting the forum! angel

    5% Discount from Electrical2Go.co.uk for ALL members! - Click Here

Discuss Fault on ring main in the Periodic Inspection Reporting & Certification area at ElectrciansForums.co.uk.

Thread Status:
Not open for further replies.
Please make sure you checkout our forum sponsors, many do discounts for members and, they keep the forum free to use.
  1. dutchy
    Offline

    dutchy Guest

    Hello everyone, I'm just looking for advice on a ring main fault, I'll try and keep the scenario short so as not to bore you al....

    I was asked to attend this fault at an on going job our firm our firm is doing (I wasn't involved from the start) The existing kitchen ring had been broken into to incorporate a new utility room a few weeks ago. I was asked to attend a fault on the washing machine tripping out the ring.
    The ring main works fine "under load" (dishwasher/tumble dryer etc) but when the washing machine is plugged in to its single socket under the worktop it takes out the mcb, but plug it in anywhere else and it works fine. (eliminating the appliance) I disconnected the leg from the spur to the single socket, and as i was testing for voltage live/neutral was fine but when testing live/earth it takes out the mcb? (I'm returning on monday as I didn't have my test kit with me)..... now without having to start stripping the ring down, does anyone have any advice on a quick way to find this fault. The house in currently having renovations done, so its possible its a damaged cable, but found it unusal that all the other appliances are working fine, without causing it to trip.....any advice would be greatly appreciated.
     
  2. IzzyS
    Offline

    IzzyS Regular EF Member

    Location:
    GB
    Is it taking out the MCB or an RCD/RCBO?
     
  3. i=p/u
    Offline

    i=p/u Trusted Advisor

    id say start from the start with r1 and r2
     
  4. malcolmsanford
    Offline

    malcolmsanford Trusted Advisor

    I would say your getting terminologies confused here and it is taking out the RCD/RCBO rather than the MCB.

    I simply say this because I think you have a polarity issue on the circuit. Either somewhere in the split you have crossed an Earth/Nuetral or more likely at the CU your on 2 different neutral bars.
     
  5. dutchy
    Offline

    dutchy Guest

    Thanks everyone.... its definitely taking out the MCB... its a split load board, and the RCD stays on....only the breaker goes.
     
  6. tonycoysh
    Offline

    tonycoysh Guest

    Leave the washing machine unplugged and tell them go to the stream..... Sorry!
     
  7. malcolmsanford
    Offline

    malcolmsanford Trusted Advisor

    Fair enough ......................but I have never known testing LIVE/EARTH to take out an MCB, some testers take out RCDs when testing like that.
     
  8. dutchy
    Offline

    dutchy Guest

    thats the thing though...the washing machine is currently plugged in to a D/S on the same ring and its merrily working away fine, but when plugged in to its dedicated S/S via its controlling spur....pop it goes!...and its definitley not the leg between the spur and socket...already checked that...??????
     
  9. dutchy
    Offline

    dutchy Guest

    me either.... its a strange one!
     
  10. Hawk81
    Offline

    Hawk81 Trusted Advisor

    Location:
    Northern Ireland
    I can never understand people attending faults with no test gear?? If you don't have test gear it's going to be very hard to fault find. I find it best to bring my test gear with me always. It's needed for all jobs anyway. Testing new installs as well as fault finding.
     
    • Like Like x 1
  11. i=p/u
    Offline

    i=p/u Trusted Advisor

    some people arnt as rich as you hawk1, they have to do caveman method and break ciruit up accordingly.. oj..

    you should have it with you. as you are ment to test before installing anything and after..... but we know it doesnt happen in all cases or any at all..


    what about this one was called to a fault few weeks ago in garvagh, the outside lighting wasnt working.. now i was witha spark helping him just, so letting him take lead role.. we walked around the perimeter to see circuit route and seen it split and went down a walkway to gate for a lampost floodlight. so went to middle of circuit and disconnected the live of one side and tried the the old mcb and still tripped and tried the other side and still tripped, so investigated on and we had found somone had added other lighting around the building frame itself. so opened contactor and seen one incomming and 3 or 4 out going circuits dont know where the neutrals were take too.. so disconnected one out going at a time and found the ciruit the fault was on and it turned out to be a ballast blown and causing a short... now this guy had no test gear, how would test gear of helped him here....
     
    • Like Like x 1
  12. telectrix
    Online

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    he could have tested you at 500V DC.
     
    • Like Like x 1
  13. tony mc
    Offline

    tony mc Electrician's Arms

    How can you be sure its not the spur leg if you have not tested it?

    Does it trip with another appliance plugged in say a kettle!

    I would start from the beginning once you get your gear and fully dead test the final ring and see what results are found for starters!!!
     
    • Like Like x 1
  14. i=p/u
    Offline

    i=p/u Trusted Advisor

    telectric i dont feel it im like plastic coated before i go to work
     
  15. dutchy
    Offline

    dutchy Guest

    the job is 100 miles away from our office, and I was passing it to get to my job (where my test kit was) which is why I have to return on monday...just didn't want to bore you all with that detail...
     
Loading...
Similar Threads - Fault ring main Forum Date
Oven Element faulty.....or is it? Electrical Forum Jul 31, 2018
Fault finding an intermittent RCD trip. Electrical Forum Jul 27, 2018
Thread Status:
Not open for further replies.

Share This Page

Users found this page by searching for:

  1. Ring main conduit faults

Electricians Directory Post a Domestic Job Post a Commercial Job