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  1. Grant McLaren
    Offline

    Grant McLaren EF Member

    Location:
    London
    I am puzzling over an intermittent fault on a ground floor/kitchen socket circuit. Initially it seemed as soon as the oven switched on the RCD would trip. However, after unplugging the oven, I used a socket tester on other sockets, which would sometimes trip the RCD. It's pretty random, sometimes it will trip as soon as you plug something in, other times not. Zs reading were fine. The ring main has been broken, although the earths are still continuous. From what I saw, the socket circuit has not been done well.

    When I left the property yesterday everything was on, but I'm waiting for a call from tenant to say it's tripped again.

    Any thoughts on what it could be and why it has suddenly started now?

    Regards.
     
  2. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Only proper testing, dead, live, IR can help you

    Have you got an earth clamp meter?
     
    • Like Like x 1
  3. Dillb
    Offline

    Dillb Electrician's Arms

    Location:
    Nottingham
    So you have used a socket tester for fault finding and left a RFC with no continuity on it?
     
    • Winner Winner x 1
  4. Pete999
    Online

    Pete999 Trusted Advisor

    Location:
    Northampton
    Business Name:
    None
    Looks that way Mate, makes you wonder sometimes. OP just be clear on this point did you do any IR testing, R1+R2 testing how did you conclude that the Zs is compliant?
     
  5. Dillb
    Offline

    Dillb Electrician's Arms

    Location:
    Nottingham
    A ramp test on the RCD would also of been a damn site better than anything else they have done
     
    • Agree Agree x 2
  6. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    Cards on table time - are you the landlord or a spark?
     
    • Agree Agree x 2
  7. Pete999
    Online

    Pete999 Trusted Advisor

    Location:
    Northampton
    Business Name:
    None
    He said he has NVQ3
     
    Last edited: May 24, 2018
  8. Murdoch
    Offline

    Murdoch Electrician's Arms

    Location:
    Woking
    In what ?
     
    • Like Like x 2
    • Funny Funny x 2
  9. Pete999
    Online

    Pete999 Trusted Advisor

    Location:
    Northampton
    Business Name:
    None
    It comes under "what electrical qualifications do you hold", under that assumption, I would guess he means an electrical NVQ3 Mind you I could say the same only I don't, have an NVQ3 that is.
     
    • Agree Agree x 1
  10. Strima
    Online

    Strima Electrician's Arms

    Location:
    St Neots
    My crystal ball is still in for calibration so I can't help...
     
    • Funny Funny x 3
  11. Grant McLaren
    Offline

    Grant McLaren EF Member

    Location:
    London
    What do you mean by RFC?
     
  12. Pete999
    Online

    Pete999 Trusted Advisor

    Location:
    Northampton
    Business Name:
    None
    Ring Final Circuit, Ring Main is no longer used, it's old hat, it is no more, Ring Main is Dead, RIP Ring Main, with your quals you should,or ought to be aware of that fact.
     
    • Agree Agree x 5
    • Like Like x 1
    • Optimistic Optimistic x 1
  13. Grant McLaren
    Offline

    Grant McLaren EF Member

    Location:
    London
    Lol you guys are funny.

    Used installation tester for testing. My point about the socket tester was that it and other nearby appliances, i.e., router or toaster would trip the RCD when I plugged it, but only occasionally.

    The question is what could cause this and why? If there was a break down in insulation between, say earth and neutral (which is possible, since a continuity test between neutral and earth on one end of the broken ring at the CU gave me around 13 ohms, why wouldn't the RCD trip all the time and instantly?
     
  14. Dillb
    Offline

    Dillb Electrician's Arms

    Location:
    Nottingham
    Wha tests did you carry out and what were the results from then tests?
     
    • Optimistic Optimistic x 1
  15. Grant McLaren
    Offline

    Grant McLaren EF Member

    Location:
    London
    I do know what ring final circuit is, I just haven't heard it referred to as RFC.

    I didn't know that ring mains weren't used anymore, although I independently stopped using rings ages ago. Whenever, I encounter an old ring, I assume it is broken and downgrade to 20amp.
     
    • Dumb Dumb x 1
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