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rcd

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  1. jjjinx

    Anyone know this RCD symbol?

    Hi guys, I know the AC symbol but the one to the right i've not seen before or just not noticed it. Anyone know?
  2. S

    Could the RCD be faulty?

    Hi, I can't get an RCD to switch on at all, even with the main isolator switched off. Is that definitely a faulty RCD or could it be something else? I have a metal 8-way Cudis CPN consumer unit with two RCDs, one with four MCBs and the other with one MCB. I originally switched the right-hand...
  3. R

    Can anyone explain what a time delay RCD is needed for?

    I've scoured the internet for what these do and am coming up short on finding information. What are these for? (ie what specific problem are they trying to solve) and why do they need to be time delayed? Thanks in advance
  4. F

    Replacement DB to Submain RCD advice

    Morning guys, I would like some advice, currently at my workplace, I am replacing a DB and existing wiring in a warehouse. One of the ways feeds a sub-db to a small office. The sub-db is an old wylex rewireable db with 3 of the 4 ways used (Sockets,sockets,lights). My company does not want to...
  5. 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...
  6. N

    C2 Vs C3 for no RCD on various circuits

    So I'm getting various responses to this depending on how things are interpreted. Here's a scenario: Assume property is a tenanted property. Assume cables are run buried in walls/under plaster (depth unknown). Which of these circuits merit a C2 if they are not RCD protected. 1. Lights 2...
  7. M

    UK RCD trip without appliance powering on

    I’m going to call an electrician out on Monday, but curious if anyone has any ideas about this fault: I have a new kitchen fitted and two existing ovens connected to existing Cooker circuit. Both ovens have been working fine. new 7.4kw hob has been just been fitted to replace a small 13a one...
  8. A

    can a consumer unit switch be replaced by an RCD?

    HI My flat just failed the EICR because there is no RCD in the consumer unit. There is no space for a new RCD as the consumer unit is full. Do I have to have a new larger consumer unit installed? Or can I have the existing on/off switch replaced by an RCD? Thanks Alan
  9. archee

    UK RCD tripping when using loft socket.

    Afternoon all, I have an issue with the loft socket. When we moved the previous owners had a 2.5mm cable going up from the CU Via FCU however, the wiring was old and did not have earths(they cut them off). So I decided to completely rip out the old wiring including unnecessary spur and put...
  10. M

    RCD Tripping times question

    A few 30mA RCBO's that i have tested recently are tripping lower at x1 than they are at x5, e.g 13.1 x1 13.8 x5, I know both these results comply but im curious does any one know why the 1 times trip is lower than 5?
  11. Rarbur

    Lighting circuit trips RCD but not MCB, can’t find E-N fault

    Long shot but thought I’d try, have a lighting circuit that trips the RCD as soon as the neutral touches the neutral bar for said RCD. Bypass that and it works fine just on an MCB so would think earth-neutral fault, but doing an IR test between N and E shows as a pass (>99M ohm). So unsure of...
  12. R

    Do SPDs need RCD protection ?

    Hi there , Currently doing a college project where i need to select protective devices for the contract. I'm now at the point of selecting SPDs and had a couple questions. I have chosen MCG RCBOs for my circuit breakers in this project for all my boards apart from the board supplying...
  13. GriffMG

    Pond Pump tripping new consumer unit RCD

    I have a fairly recently installed consumer unit with an RCD, between it and the garden there is another, much older (25yrs?) RCB (big Wylex thing) from which a couple of power points are provided on the wall of my fish ponds. Before the consumer unit was fitted I could run the pond pump from...
  14. W

    Does a 32amp distribution circuit wired in SWA to a sub board need RCD protection ?

    For context i am in my 2nd year in college and my head is going round in circles a question in my project for which i need to select the right protective devices for : A 32A distribution circuit from the main board to supply summerhouse will have a four-way SP-N distribution board fitted...
  15. I

    SPD on RCD acceptable or not?

    Inspecting and testing a consumer unit as part of my training and have noticed that the circuit breaker for the SPD is on the RCD? I am unsure weather this is acceptable as I haven't come across this configuration and I am pretty new understanding SPDs could one of you more experienced people...
  16. Y

    RCD disconnection times help!!

    Im suppling distribution circuits and want to use the largest possible RCD available to avoid nuisiance tripping (its for outdoor street furniture and its a TT system). The Ze is 160. The reg below says 1 second disconnection time but cant find anymore info in the regs about it. Closest I can...
  17. S

    Multiple Domestic Distribution Units - RCD Topology

    Cascaded Distribution Units. Given how cheap populated distribution boards are; i've started to use them for almost every major junction in my home: Domestic Main Distribution Unit >10mm swa > Garage Distribution Unit > 6mm swa >Spa Distribution Unit...
  18. O

    Electrical inspection EICR no RCD

    Did a couple of inspections on 2 x 2 bed ground floor flood damaged flats today, only 4 circuits in each, bizarrely one socket circuit and 2 lighting circuits and one cooker circuit in each. Just a 4 way MCB consumer unit in each without RCD protection on any circuit, built and wired in the...
  19. newfutile

    Rcd disconnection time on TT

    On a TT system the rcd must operate withing 0.2 seconds for many circuits. Why when we test rcd's does it not say 300ms for TN systems or 200 ms for TT systems?
  20. R

    RCD requirements for old install

    I'm a property owner who is needing to get an old electrical installation NICEIC certified. One of the buildings is a small office block with 6 small offices. The offices aren't currently being used commercially, this certification is just for insurance reasons. The main fuse box is an old...

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