rcd

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  1. M

    Trip MCB at times RCD too intervals days or hours; test if faulty appliance

    Hi I am asking for help as a novice and 1st time user of this forum. Recently started to experience tripping of MCB & sometimes with the RCD at random times, intervals can be days after resets or several hours. Could an appliance or appliances be overloading the circuit? How can I test an...
  2. B

    UK 3 phase rcd protection

    Hi everyone, I have been asked to pull in some new 3 phase supplies for 7 new welders which do not require a neutral connection. The client has specifically asked for them to be plug and play and rcd protected, which is fine as they are under 32amps. I will be running in 5 core swa's for...
  3. tony9i9i9i

    Faulty RCD tripping on the button but not via the tester

    What should you do if a client has a CU that is a split board protected by 2 * 63Amp 30mA double pole RCCDs, you took Zs and tested both RCCDs by their buttons before starting work. But on completion of work, one of the RCCDs, when tested via tester, would not trip, the other operated as expected!
  4. A

    Adjusting tripping time.

    Hi all, Curious one and hopefully some one of you could give me some advice. A customer has had a steeltech shed installed at their premises. A large one. Wants 3x light fittings and 5 double sockets intalled. There's an electric roller shutter door on the shed also to be plugged in. My plan...
  5. J

    S-Type RCD Selection

    I was wondering if someone might be able to help either confirm or change my understanding on the use of S-Type RCDs. I believe that they can be used to aid with selectivity and avoid potential nuisance tripping, providing the ratio of the rated residual operating current of the upstream S-Type...
  6. C

    UK Change RCD type at CU to enable RCDs at socket outlets

    Hello All, I am a homeowner (but not an electrician) and I am renovating a house that has an old CU containing MCBs and an MK LN5725 residual current-operated circuit breaker on the supply side (25A, 30mA trip current). The RCD is there because some of the circuits supply power to outbuildings...
  7. cliffed

    RCD Tripping intermittently

    Called out to fault on RCD tripping maybe twice in a month for sometime. Did all the tests & found RCD was faulty, Refitted a new Rcd Type A which made matters worst. So refitted original RCD Type AC for the time being. Insulation Resistance measurements were 20 M ohms. Ring continuity fine...
  8. I

    TT Install with Solar - RCD question

    Hello Need to replace a distribution board in the next few weeks to allow for more circuits to be installed in January. Existing is a TT system with a solar installation fitted. Current install has a 100A TP incomer, meter, C63 TP MCB, solar install, 100ma RCD, distribution board fitted with...
  9. C

    CU change where sockets can’t go on RCD

    Hi, I have a job for a customer, the consumer unit is an old 3036 board and there are several holes in it giving access to live parts, I can change the consumer unit but when put on an RCD the sockets trip. IR readings on the sockets are low but the customer isn’t in a position to have them...
  10. S

    UK RCD Type A or Type S?

    Hello! I've been racking my brain this evening about some RCD selections. I've been doing some work for a solar installer, and they've asked me to do a battery storage setup, specifically with EPS for battery power. I'm stuck on my RCD selection because basically, I'm going to shift 4x...
  11. A

    UK RCD nuisance tripping

    At my place of work we have just had multiple LED advertisement screens fitted outdoors, the company specified 16amp RCBO’s for each set of screens. On powering up, the circuits were nuisance tripping due to earth leakage. So the company who installed swapped the rcbo for MCB’s. The screens...
  12. E

    RCD tripping. Not appliance

    An RCD keeps tripping. Please see attached photo of the board (2 photos attached). I’ll call the breakers: MCB (1) marked ‘Upstairs lighting’ MCB (2) marked ‘Sockets’ MCB (3) marked ‘Water heater’ MCB (4) marked ‘Sockets’ RCD (5) for MCBs (1-4) MCB (6) marked ‘Kitchen sockets’ MCB (7)...
  13. HappyHippyDad

    Type A rcd for cooker or type AC OK?

    My builder has sprung a job on me. New circuit required for a hob. The CU has a single 30mA RCD, type AC. I am still unsure exactly when I should insist on type A, and when I should just advise. Would you guys be insisting on type A in this case, thus fitting a new CU (as it is an old NSB wylex...
  14. M

    Changing main RCD AC-type to A-type

    Hi, I'm back in the electrical game after 9 years break so feeling a little rusty! I'm adding an additional socket to a circuit but the main RCD feeding all the circuits in the consumer unit is AC type. Based on this, I believe I have to change this to an A type which is fine but the question...
  15. H

    Intermittent RCD Tripping - opposite side of board

    Cant get my head round this :( I understand N-E faults cause RCD's to trip, but I cant understand why on these 2 occasions, googled allover but no real answer. I have 2 intermittent faults on the go, one Dual RCD board, one split load, 1 RCD. Dual 2 RCD Occasionally the left RCD trips when...
  16. mattgriff88

    RCD tripping switchless socket?

    Hi, I swapped a 2 gang switched socket for a 2 gang switchless socket with usb ports downstairs. I switched off all the power to the house by pulling down the double red switch on the rcd box. When I turned it back on the individual rcd switch for the downstairs circuit tripped. I turned...
  17. spud1

    Does an RCD still function when Solar PV is generating?

    Hi everyone, I wondered if anyone could help me with something that has been niggling me please?! When a Solar PV feed in circuit is installed and added onto a spare way of the RCD protected side of a split load dual RCD consumer unit (i.e. other final circuits are protected by that same RCD)...
  18. 2

    Nuisance RCD Tripping - Diagnosis Advice PLEASE

    Hi all. Have an issue i'd love some advice on if anyone would be so kind. Will try to be brief. Thank you!! So, have an intermittent RCD trip at my home. Big old house with an installation of nearly all old tinned copper wiring, that for the last couple of years, hasn't missed a beat. Old...
  19. B

    UK RCD before a 230v/24 PSU?

    Hi all I have seen a schematic drawing for a control panel recently where they (whoever drafted the drawings, designed the panel) show a RCD before the 230v/24v dc PSU, and the PSU is the only device downstream of the RCD in my mind this has no merit. The 24v secondary d.c side of the PSU...
  20. L

    Is there a chance Dual RCD Consumers could be "banned " from rentals soon?

    Client has purchased a night flat in Edinburgh. Its perfect for using as a ST rental during the festival as the agents claim £6k a week is the value based on rooms and location. It was nicely decorated in 2018 and has a twin RCD Board . Wiring etc etc looks very good .Its a tidy install ...
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