rcd tripping

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  1. B

    RCD tripping time (in factory)

    Hi, bit confused, have an RCD Main Switch 250A with variable settings for mA and mS, now this is set at 1000mA, 1s time delay, I’m getting 99ms with set on 1000mA and no time delay my tester does not do 1s delay, now this board feeds another, so will I put 1099ms for tripping time? I was just...
  2. F

    RCD Tripping Randomly When PC Plugged In

    Hi everyone I have a frustrating problem which has recently developed. I kept finding that my power was tripping. I could just reset it then everything was fine for a while then it would happen again. It might happen once per day or it might happen a few times or it might not happen at all for...
  3. HappyHippyDad

    Why isnt the RCD tripping?

    I have just completed an EICR. The install is TT, Ze is 308 ohms. Zs on all circuits is <1.5 ohm due to bonding. There is an up front 30mA RCD which trips with the push button but does not trip when tested either at a socket, light or actually in the RCD itself. I know the RCD is faulty as I had...
  4. E

    Missing earth connection.

    Hi all, I was at a property yesterday and found a number of problems with their installation. To name a few. 6mm radial supplying a 8.5kW shower and 3.5kW emersion heater on a 32A RCBO. Extractor fan unfused and spured from shower in 1.5mm cable. Isolator and light switch in zone 2. When...
  5. S

    RCD tripping under high load on 2 circuits

    I’m in desperate need of someone with great fault finding knowledge. I have a dual rcd consumer unit as seen in picture. The left hand side rcd trips when anything with a high output like a tv for example is turned on in any sockets protected by the left rcd. The left rcd also trips when trying...
  6. polo1

    10mA rcd tripping on Zs test

    As above, taking a Zs measurement on a circuit covered by a 10mA rcd. Tripping the rcd on a no trip, three lead test using a Megger 1721. Is there a change in the settings I’ve forgotten about to allow a Zs to be taken. Oh, testing at a socket rather than source. TIA
  7. S

    RCD tripping when switching oven isolator off

    Hi all. I was called to a house recently where the occupier reported that when they turned the oven isolator off the RCD would trip. So I tried it and that's exactly what happened. There was nothing switched on on the oven at the time. When the oven is on it works fine. It is an integrated oven...
  8. M

    RCD tripping with PV

    I have been working my way through an installation looking for why the RCD trips in light misty rain. I have eliminated all outside installations the only thing left outside the building are the solar panels. I know little to nothing about the PV installation. So my question is, is there...
  9. Y

    Main rcd tripping even though its 100 ma

    Hi There's a workshop outside the main building with a couple of sockets protected by a 30ma rcd. Even though the rcd inside the main fuse box is 100ma the 100 ma rcd trips without the 30ma not tripping. Changed 30ma rcd still same. How can I get the rcd in the workshop to trip without tripping...
  10. E

    Rcd tripping strangely

    Hi Don’t often post on here but I’ve dreamt about this issue last night. Need advice please Yesterday I attended a property to complete an EICR, home owner had moved in the previous week. Customer has not had any issues with the install, all circuits powerd on a 16th edition cu split load...
  11. buzzlightyear

    rcd tripping i wander why

    content://media/external/file/19941customer rings me up to tell me the rcd keeps tripping .opened a. Ip external box and a family of slugs are in their has well has other creatures. David Attenborough would love to see this.
  12. D

    rcd tripping on a ring main

    Ok help before a pull out the rest of my hair got an rcd that trips when ring main breaker turned on got continuity but still trips when only live connected ant ideas
  13. J

    RCD tripping issue on ring circuit

    First time poster go easy on me. Got a call out to a job today, got told the RCD was tripping. Even when no appliances plugged in. And so it was intermittently about every 20 mins. Only two ring circuits on the RCD, on one of the rings im getting continuity across line and netural on both legs...
  14. B

    Rcd tripping below 30ma

    40A 30ma RCD tripping out at 22.5ma, would people say that’s low and acceptable as I’d say it was a bit low should be more like 28ma?
  15. B

    300ma RCD tripping randomly

    Distribution unit 100A 300ma 3phase RCD with four 60A BS88 each fuse feeds 4 boxes on one circuit with 2X16 socket outlets with own individual 30ma RCBOs but there ok and all being plugged into The RCD keeps tripping? Have tested the distribution unit and all the boxes with IR test and RCD I’ve...
  16. R

    Strange RCD tripping scenario

    Any suggestions as to possible causes of RCD tripping in the below domestic scenario would be helpful: Origin: single phase TT supply into an external cabinet housing cutout and our installed 100A 100mA Type S 2Pole RCD. Earth Rod has also been sunk here. House: 3c SWA supply to house from...
  17. P

    rcd tripping during the night and insulation resistance testing question

    Hi everyone I have a customer who has a RCD that trips during the night and it resets ok the following day it is ok for a week or so then it tips again during the night. has any one any ideas and what is the quickest way of finding out what the cause is. also I need to do an insulation...
    • phil lancaster
    • Thread
    • during insulation insulation resistance insulation resistance testing night question rcd rcd tripping resistance testing tripping
    • Replies: 34
    • Forum: UK Electrical Forum
  18. R

    RCD tripping has anybody any Ideas?

    Been to a customers home today,Reported fault was when he turned the kitchen light off the RCD tripped Problem is its a split-load board and the lights are not on RCD side The light switch in question controls 3 pelmet lights wired feed+N to switch and twin out I couldnt get this fault to happen...
  19. A

    French House 3-phase RCD tripping

    Hi All, Long time lurker, first time poster. We staying at a family friend's house in france and they are having frequent trips of their electrical system where they turn multiple breakers/the main switch off and on until it comes back on. Over the last week I've managed to narrow down a...
  20. B

    Very strange RCD tripping problem on TT system. Need advice

    I'm in France and this is my first post, so apologies if this is in the wrong section. Here is the problem. I have a client, with a swimming pool and heat pump for the pool, but their main supply keeps tripping. The connection is: * Supply companies incoming feed, three-phase, limited to 30A...

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