rcds

  1. timhoward

    Distribution circuits in Section 705 location, RCD needed?

    I just want to check how I should be interpreting section 705. 705.411.1 states required disconnection devices, the first two indents covering final circuits and sockets, requiring 30ma and 100ma RCD's depending on rating of socket. Indent 3 says " all other circuits" need 300ma RCD. Does that...
  2. DaveyD

    Maintenance replacements and Type AC RCDs

    Morning all. What’s your feelings now in 2024 with maintenance replacement of say an extractor fan or similar in a domestic setting where the system has 30mA RCD/RCBO AC protection. The old saying was ‘like for like wherever you like’ but now. Would you Maintance replace and upgrade the...
  3. 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...
  4. D

    NICEIC Certification Scheme New Circuit - NO RCDs

    A client wants an outdoor socket installing on a new circuit. The current installation doesn't have any RCDs for the other circuits. I would put the new circuit on an RCBO but I'm concerned about signing off the installation with the other circuits not protected by RCD. Anyone know what the...
  5. O

    Sequencing of RCDs and MCBs

    Hello sparkles, I have a question in relation to sequencing the RCDs and MCBs in the CU. I called an electrician to come to my house and upgrade the CU. Because it was hard to re-arrange the sequencing, an additional RCD was installed and the corresponding new MCB after it, but one old MCB is...
  6. Z

    All neutrals connected at one point - two rcds.

    Hi guys. Fuseboard looks fine, but all neutrals are connected at one point outside the fuseboard. That way both rcds trip on fault on any of the circuirs.How would yiu code that? P.s. also no glanding and cables rubbing on the sharp edges of CU? Thanks
  7. V

    RCDs not operating as expected

    Hi Ive looked around and i cant see this particular scenario being discussed. I think i may have been a numpty, but bear with me. I have just completed an electrical install into an outbuilding. Its distance meant i went with installing its own earth rod, thus not exporting the pme from the...
  8. S

    350ma test for type A rcds

    Just wondered how we would know a 30ma type A rcd/rcbo will trip at 30ma,if we can only test it at 350ma?Think I must be missing something.Thanks for any help. Regards,S
  9. B

    Oven tripping both RCDs

    Hi all, Just after a bit of knowledge to satisfy my own curiosity - hope this is allowed within forum rules 🙂 I’ve just had a new kitchen installed and the electrician came today to connect two single ovens. They are each connected to their own MCB on different sides of the CU. One of the...
  10. G

    UK Type B RCDs for fire protection?

    Hi all, not been around in a while but I'm working through a quote at the moment and found this at the end of the equipment (AC kit) suppliers quote. From the icons provided were definately talking B type and not B curve. For the job in question this one paragraph statement could add...
  11. M

    RCDs in series and garden power

    I wired a new circuit in my garden last year. One thing I wasn't sure of but figured it can't be much of an issue was having two rcds on the same circuit. So from the consumer unit I have a 2.5mm ring to a Wiska box outside. That then is a roughly 5 metre piece of 4mm swa into the shed consumer...
  12. R

    Neutral to earth fault affecting both RCDs

    Hello everyone, I'm newly registered having read the boards from the shadows for a while. I have a question about neutral to earth faults and RCDs. I have read around this as much as I can but being relatively newly qualified my experience isn't as much as the collective members here so I...
  13. K

    UK RCDs and storage heaters?

    RCDs and storage heaters, yes or no?
  14. T

    Why are RCDs so massively over-expensive?

    Hi, We are going into business making RCDs. We cannot undertsand why this massive gap in the market has been missed? All existing offtheshelf RCDs are >£30 and massively over-engineered!!!. Our method is a simple version of a "Fluxgate current sensor". That is, we use the fluxgate principle...
  15. S

    Both RCDS Tripping

    I have a problem with two separate rcds tripping, both are from the meter, one consumer unit in the house and one in the workshop 30m from the house. If the workshop rcd trips it also trips the house rcd. both consumer units are fed direct from the meter, the workshop having a 80a isolator...
  16. R

    RCDs on Machines

    I am looking at installing electrical supplies for a series of equipment that form a DPF test bed. There will be five individual machines needing 3 phase supplies via a plug and socket arrangement, this has been specified by the manufacturer, isolators are not allowed. The biggest supply is...
  17. D

    C2 code for no RCDs?

    I have recently had an EICR on my tenanted 1st floor purpose-built flat, built in 1995. I have received C2 codes for lack of RCD as follows: 5.14 No RCD for additional protection 6.18(a) No RCD for socket-outlets 6.18(b) No RCD for supplies for mobile equipment for use outdoors (this is a 1st...
  18. M

    How come some rcds dont trip when testing voltage to earth

    So I recently installed a new circuit to my loft as a dedicated burglar alarm and cctv circuit. When checking polarity and voltage with my test lamps/voltage indicators it didnt trip the rcd when testing live to earth and neutral to earth. It's an rcbo which works when using the functional test...
  19. J

    UK MK RCDs

    Hi there, I picked up an MK domestic CU, which comes populated with 1 x main switch, 1 x SPD and 2 x RCDs @ 100A 30mA each. I planned on replacing the MCBs with RCBOs which are also rated at 30mA. Because both the RCBOs and RCDs are rated 30mA, it's anyones guess as to which will trip...
  20. N

    RCDs, 100A vs 80A vs 63A

    Domestic CUs- I can't remember where this bit of info came from, but since the latest update I am 'under the impression' we can no longer utilise cons units where RCDs are rated below the rating of the main fuse. E.g. can't use a dual RCD consumer unit with 80A or 63A RCDs if the cut out...
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