rcd

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  1. 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...
  2. 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...
  3. 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...
  4. S

    UK 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...
  5. 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?
  6. 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...
  7. S

    RCD on commercial lighting

    What does the 18th say about RCD on commercial lighting
  8. M

    UK RCD rating in Sub board less than suppy protection

    I have a 40amp RCD downstream of a 50a MCB (10mm csa cable) should the MCB be lowered to protect the RCD from overload? If so why does this not apply to RCD devices in Split Load boards
  9. N

    RCD Tripping when bypassing kitchen circuit straight from main fuse

    Ran a 4mm straight from main fuse removed busbar and put 4mm into bottom of breaker, RCD keeps tripping
  10. W

    Do Distribution circuits require RCD protection?

    I'm doing a college design project and need to choose a suitable range of circuit protective devices for the whole contact. I've chosen and already done all the protective devices for all my final circuits but was curious if the distribution circuits need RCD protection aswell. The project...
  11. Lainan01

    Maximum Zs on circuit protected by RCD - 1667?

    Does a RCBO protecting a single circuit mean it can have a maximum Zs of 1667 Ohms since it's being used as fault protection?
  12. K

    Does anyone know what RCD fault he is talking about

    Hi Basically I have visited a youtube link of another electrician and he is talking about how many electricians find RCD fault very hard to resolve and he mentioned it takes less than 3 minutes using the method he mentioned but not completely hence its really puzzling me so if anyone could...
  13. G

    UK RCD sockets regulation

    Can anyone tell me the latest regulation for RCD protection on socket outlets, I believe it's required for sockets up to 32A but I'm told it applies to all socket outlets, we have to install a 63A 5 pin socket located outside. Thanks in advance
  14. B

    N/E fault IR=0 - RCD won’t hold

    Hi all, After some options/opinions on fault finding N/E fault on ring final as fairly newish to being out alone. Customer wants to upgrade from rewirable CU to RCBO so fairly old wiring but no signs of cable breakdown or anything totally messy on inspection. This circuit basically holds...
  15. baldelectrician

    EICR question, OLD AC RCD- code 3 or no code?

    With regards to Regulation 531.3. 3 of BS 7671:2018+A2:2022 Older AC type RCD's are prone to being blinded by dc leakage from other items plugged in to the property. In other words this RCD may fail to operate when other electronic items are plugged in which leak DC in to the mains. Regulation...
  16. Lainan01

    Real life examples of RCD fault

    What’s a real life example of an imbalance between live and neutral? For example, a faulty tumble dryer can trip a RCD on a split board - so I would assume there is an imbalance because of the difference in the magnetic flux between the Live and Neutral coils. But what would be the actual...
  17. M

    RCD trips when screw touches lug

    DIY question. I have been changing old metal socket faceplates to the normal plastic ones. All are working fine except the faceplate of a fused switch. Everything works fine when it isn’t screwed. It is a fused spur for a light in the conservatory. The light works fine when the screws are off...
  18. driverJohn

    TT earthing enquiry.

    Hi do tt earth systems highly require a rcd, and if not are upfront rcds a must in the tt earthing systems? Cheers
  19. S

    RCD trip when power cut occurs

    Hello. we have had a few powercuts over past few months and am in middle of one at the moment where power has gone off a few times while DNO are trying to resolve issue. House is a mid 1980'S PME and on housing estate. Current setup is single RCD with mcbs. Am currently waiting for spark to...
  20. Simonson82

    Dual rcd board to rcbo

    I've got a dual rcd mk sentry board that I want to inverter into an rcbo board. If I link the two neutral bars from the main switch is this OK to do regs wise? Thanks

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