rcd's

rcd's

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  1. 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...
  2. cdtsilva

    B Type RCD's and electronic loads

    I have seen recent changes that require (most) EV chargers and solar systems to be fitted with a type B RCCD. I work with power semiconductors and inverters for a living and have one of these in my workshop with a dedicated circuit. The question arises on any downstream RCD's that may be...
  3. V

    EICR code for lack of discrimination between RCD's

    Hi all Called to do an EICR on a property 4 studio flats / bedsits within a single house. The t&e sub main to each flat runs within the fabric of the building and has a 30mA RCD at its distribution point...assuming this was an add on to the original installation. Each flat has a RCD main...
  4. W

    RCD's not tripping at all

    Hi all, Just done an EICR and all tested fine, until I got to the RCD's. It's a dual RCD board, not sure if it's TNCS or TNS as it's a top floor flat fed with T&E. The RCD's failed to test via the circuits and so I tried the test buttons and they didn't work either. Could it just be both RCD's...
  5. O

    Can anyone explain type A RCD's

    I get how they work and can kind of understand the reasoning, I remember the early "no-trip" RCD testers, D-LOG made one that saturated the RCD core with DC to stop it tripping whilst doing an earth loop test so I agree that stray DC leakeage could stop an RCD tripping. But, lets say you...
  6. J

    SWA as cpc to submain-Suitability, & PC's on RCD's.

    Been looking at a CU change in a small office and would appreciate comments on the following. Office is supplied from the mains intake in the warehouse via a 2 core 16mm SWA buried under concrete with the SWA used as cpc (60A BS88 is the protection). Mains intake in the warehouse is a 3 phase...
  7. G

    EV chargers and double pole RCD's.

    So regulation 722.531.3.1 says RCD's shall disconnect all live conductors. Is this requirement met if the charger itself contains a DP RCD? As presumably there is no reason that the installed circuit requires a DP RCD? in fact depending on cable type and install methods the cable may not need...
  8. HappyHippyDad

    Difference between 1p+N and double pole RCD

    I need to replace a Hagar RCD (model number CN284U). This is a type AC RCD and I wish to replace it with a type A. The model number for the Type A equivalent is CNA584U. They are both 100mA, 100A, S type. The only difference being is that the Type A RCD is referred to as 1P + N rather than...
  9. G

    Type AC RCD's and EICR's

    Hi all. What are your thoughts on coding type AC RCDs when doing EICR's? I understand the issue on DC currents preventing RCd's from functioning correctly. The Am2 version of code breakers suggests a C2 coding for: "....type AC RCD and has pulsating DC currents from connected equipment such as...
  10. W

    110v 55-0-55 RCD's C16

    Hello, Anyone know of any RCDs for CTE 110v sockets that dont cost a small fortune? Need some for some high EFL 110v sockets in a factory I do work in after an EICR.
  11. HappyHippyDad

    Are you replacing type AC RCD's with Type A?

    Just looking for a bit of clarification regarding RCD's. A type AC RCD is no longer acceptable for offering additional protection for socket outlets. If you are (for example) adding one socket to an existing circuit are you all updating the RCD to a type A? I can see this being a bit tricky...
  12. J

    Do I have to fit RCD's in my 1930's house ?

    I recently bought a new gas cooker which has turned out to have 2 faults within the first 3 days. An engineer from the supplier was summoned to fix it but would not deal with it as my Distribution Board does not have any RCD's. There was no requirement of this when buying the cooker and now they...
  13. timhoward

    IT system - how do RCD's ever work

    To avoid distracting another thread... @Julie helpfully said that an RCD can be used with an IT system to achieve disconnection after the second fault. I'm not understanding how. If both faults are between transformer and a load it just becomes a parallel path with negligible resistance, and...
  14. B

    One or 2 RCD's?

    I am currently running around the country completing remedial work on the back of EICR's and have came up with a confusing pair of C2 faults as listed below: Now? How would I go about this to tick off both C2's. My thoughts are to place an RCD at the source of the circuit + the switch needs...
  15. V

    Two RCD's on same circuit - Test failed

    Hi, quick question before I start ripping a customers Consumer Board apart. Called out to a simple job of installing electric supply to a summer house. Nothing major being used in the garage or planned to be in the summer house and is only 10m from the house so was happy to extend the radial...
  16. L

    Anyone else still not bothered about their MFT's testing A type RCD's ?

    Seems many are using older MFT's and cant be assed to keep paying out ?
  17. S

    Separate Arc fault protection devices not needed with RCD's?

    I'm looking at replacing my old switchboard with a new RCD/AFCI one. I asked the electrician who was quoting the job about Arc fault interrupters. I previously understood these were a different device from RCD's-RCD is to prevent shocks, AFI to prevent fires. I also understood there were devices...
  18. V

    GFCI's and RCD's

    I'm sure this is something that someone has come across, but anyhow. Been asked to install an inflatable hot tub for a client. They already have a summerhouse with its own CU which is connected back to the house via a 6mm SWA to a Henley block tapped off the incoming tails. There is an RCD in...
  19. EricMark

    RCD's how to test and when required, and what code?

    I know how I was taught to test a RCD, 6 tests in all two no go, two under 300 mS and 2 under 40 mS with no load. But thinking about it not so sure on the no load? We are told there are 5 common types with some others not seen much, type S, AC, A, F, and C. OK type S not used much now, but when...
  20. D

    RCD's Failing

    Investigating for remedial works, 2 identical but separate installations (MK Dual RCD 4+4 consumer units with 60898/B MCB's) CU 1 RCD1 x1 >300mS, x5 >40mS, Test Button - Doesn't trip. RCD2 x1 24mS, x5 17mS, Test Button - Trips CU 2 RCD1 x1 >300mS, x5 >40mS, Test Button - Doesn't...

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