rcd

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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)...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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)...
  13. 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...
  14. 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...
  15. 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 ...
  16. EricMark

    RCD if required and what type, re-solar panel installation?

    I decided to get solar panels, the inverter instructions say one can use type AC, so the existing 14 x RCBO CU seems OK, may be a good idea to fit type A in the future, but if following what is says in wiring matters should have type F for my inverter drive washing machine, as if that will ever...
  17. S

    RCD trips with all load breakers open

    My circuit panel has two banks of breakers, each bank protected by an RCD. One of these RCDs has been problematic in that it trips intermitantly. A few months ago it became so frequent that we had the RCD replaced. It would trip regardless of what load breakers were shut or open. No fault could...
  18. H

    RCD without neutral 2 phase supply

    Hi everyone, Quick question can you fit an RCD without any neutral connections? If I have a 3 pole circuit breaker which has all 3 poles terminated with a 3 phase supply (L,L,L excluding neutral or earth) on the primary side and I am using only 2 phases on the secondary side (L,L) to create a...
  19. I

    Spur line (non ring) on TT supply question.

    Hi Guys, Long time member and not a regular user here. I do pop in here when the odd unknown pop's up and unable to locate an electrical dilemma and cannot find a person that has the expected knowledge and can explain and help, as yet unable to find information even from respected persons. Let...
  20. P

    Non-selective RCD with SPD downstream

    Hi all, Grateful for your expertise regarding my confusion on the below. Context: French rural domestic property Single phase supply, TT earthing Supplier side RCBO (standard in France, usually next to the meter) - "disjoncteur de branchement" - 500mA, single pole protection, unspecified...

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