rcd's

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  1. KeenPensioner

    Rating of RCD's

    I am an adult learner. I understand the theory behind the 30mA trip rating (for example) of an RCD but I need some help understanding what the 63A rating (for example) actually means. My understanding is that RCD's do not provide over current protection, that would be provided by MCBs (for...
  2. P

    Upstream RCD's

    Hi all, I am currently planning on designing an installation for a conservatory to be fitted with lights, floor sockets, and underfloor heating. My plan was to take a 6mm T+E from the Hager consumer unit under the stairs, protected at 32A, which would then run above the ceiling of the room...
  3. DmackG

    Electrical Installations in Schools

    I have been trying in vain to identify whether there is or indeed has been, specific wiring regulations for schools/colleges or universities. eg New Zealand Ministry of Education have an "Electrical Installations: Standard for Schools" in which they state the requirement for all sockets to have...
  4. A

    Random RCD's tripping

    Hi to everyone, I'm new on the forum and a almost a new in this world too. I got my full qualifications done in April but never done any job yet. So I'll try to explain the situation in the best way I can 3 double light holder on the outside of a wall are on a single way switch. The switch is...
  5. G

    Type A and AC RCD's

    Just watched an interesting sparkyninja video called "should we just stop using type AC RCD's?" highlighting the issues in using them, and the slightly ambiguous phrasing used in bs7671. Just wondered what others thought about it, and what if anything you were doing?
  6. gazdkw82

    Numerous RCD's, selectivity

    Looking for a little advice. I was speaking with a colleague who was confused about a circuit design that doesn't offer much selectivity. A sub main is being fed via a SWA to a 63A commando style outlet which is to be used for temporary set ups (shows, Marquess etc). The circuit is protected...
  7. mattg4321

    Type A RCD's and testing

    Following on from a recent topic on here I thought I'd start a poll on this. Various videos on youtube are suggesting we should be thinking about phasing out Type AC RCD's and use Type A instead See Sparky Ninja here Also of interest is GSH Electrical's video which deals with problems...
  8. rolyberkin

    RCBO Test data - 40 milliseconds

    Okay may be a thick question but I have an RCD tripping on 5 x test 180 at 40ms. Pass or fail? GN3 says must not exceed 40ms BBB says within 40ms My tester says computer says no. To be honest I am recommending it be changed anyway but it will be a call back on a new build for another spark so...
  9. V

    EICR and RCD's. Is it a C2 or C3?

    Hi, My EICR is a C2 because the consumer unit does NOT have RCD's. Is it correct? My last EICR five years ago stated RCD as recommended. What's changed? The flat is on the 2nd floor built in 1997! The electrician has quoted for a NEW Consumer Unit. Thanks Victor
  10. HappyHippyDad

    Understanding 411.3.4, RCD's for lights.

    I just wanted to make sure I understood the new regulation above. I am about to replace some ELV downlights with mains voltage, do these now have to be 30mA RCD protected? At present they have 100mA protection and the earthing is TT. Cheers.
  11. C

    MK time delayed rcd's?

    I asked my wholesaler for one today only to be told they're discontinued. A quick google of MK 6400s seems to confirm this. Does anyone know why this is and if Mk are producing a new version for some reason?
  12. D

    Both RCD's trip randomly

    Scratching my head a bit on a job today. Been to clients house to investigate fault with installation. For the past few months client has reported that both RCD's on his dual RCD board have tripped at the same time on odd occasions thus losing all power to house. House was rewired by another...
  13. B

    How do you test RCBO's Same as RCD's

    May be a silly question but are rcbo's tested the same way as RCD's?
  14. leep82

    RCD's in series and how to test

    Im currently working on a site where im testing the supplies to the site cabins. Each cabin has its own 6 way single phase DB with a double pole RCD as a main switch. The DB's are then fed via commando plug and socket arrangement from a 32a RCBO within a TP&N DB. When the cabins were originally...
  15. W

    Rcds not tripping at 50ms now

    Hello I've got a rcd It trips at 1 times okay but gets greater than 50ms at 5x on one cycle but it's okay on the other cycle on three rcbos out of 5 it's not the circuit I've swapped over the cable what's that mean what will happen
  16. Dannyg8810

    16amp 230 3pin sockets and rcd's

    Just want other people's opinions on this In a warehouse were 16amp sockets are used for conveyors only would these need to be installed with rcbo's or just an mcb?
  17. S

    For sale: Main isolators, RCD's, RCBO's, MCB's ...

    Hi all, A am selling some Main isolators, RCD's, RCBO's, MCB's and some other stuff as seen on the picture. Most of the items brand new, some have served as display but never used. PM me if interested, so I can send a list with all items. The ideal situation will be if someone wants to buy...
  18. U

    Old regs

    Hi all. Chatting with a friend earlier on and he happened to mention that his house has no RCD protection. Now this is an old house, he has never had any work done on it as far as I am aware of in the last 35 years. he owns the property but originally it was council owned. I am astonished that...
  19. H

    7 x Memera 2000 80A 30mA RCD's required

    Hi, if anyone has any of the above please let me know. Cheers
  20. K

    2 RCD's on circuit

    Viewed a friends house where a 10mm cable from the consumer unit is feeding a Sub-consumer unit in the shed... The circuit itself is protected by a 32A MCB breaker under an 30mA RCD at the main consumer unit... The sub in the shed is a single RCD and with a single 32A MCB... Problem is that...

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