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  1. M

    RCBO trip.

    Got a large rewire ongoing at the minute. Owner wants to use current sockets alongside the new board as he’s living in one part of the house whilst the builders are in. Today the old supply was disconnected and whilst cutting through an old cable not connected to any of my new legs the RCBO...
  2. littlespark

    On the search for mk rcbo.....

    ....To fit old Sentry board. Present board has 80A, 30mA RCD mainswitch, and it’s a 16 way board!! I can’t get all circuits to stay on all at once. Have to leave any one of 3 lighting circuits off for rcd to hold. Individually they work fine. Accumulative earth leak between all circuits...
  3. C

    MAX Zs with 61009

    Why do we have maxuim Zs for 61009 RCBO's? I didn't think Zs values really mattered if the circuit was covered by and 30mA RCBO/RCD?
  4. G

    RCBO Type for Bathroom Lighting

    Perhaps unwisely, I offered to source an RCBO for the spark who's coming to do a couple of small jobs in my bathroom: 1. Connect up an electric towel rail heater (IP65) 2. Replace the MCB for the bathroom lighting circuit with an RCBO, as a quick temporary fix to make the bathroom lighting a...
  5. S

    RCBO fitting

    Hi guys, ive got some work to do on a domestic lighting circuit and I need to provide RCD protection to the circuit, can I fit an RCBO int the existing insulated consumer unit and issue a minor works certificate or do I need to price for replacing with an 18th edition consumer unit?
  6. S

    Previously working PV/Battery system starting popping RCBO when SMETS2 meter fitted

    We had a PV/battery system was fitted in late May, and measurements showed it was working very well, but then a few weeks ago the old meter (electronic box about the size of a large cigarette packet) was replaced with a SMET2 meter and everything went down hill! When the PV system was working...
  7. M

    Only 2 brands for domestic type A rcd/rcbo + type 2 spd in board??

    Looking around I'm wondering if I'm going mad. Would have thought type 2 spd next to main switch and type A (not type AC) rcd/rcbos would be the standard everyone should be looking for now (even if it's just recommended and not strictly required in domestics). But only Wylex and Schneider seem...
  8. DT1991


    Fitted a new Schneider RCBO B20 30mA Single Pole Type A. Connected function earth and neutral lead, with rcbo turned off, turned slider on, turned rcbo on, tested operation of push button and it went kapot! Test button now stuck in and will not reset? Ideas anyone or just a faulty RCBO? Edit...
  9. T

    RCBO tests

    Anyone an idea why an RCBO measures >40ms on a 5x test on the second half of the sine wave but all other tests are within requirements? Sorry, it's not a single RCBO, there's 2 RCBOs in this board and both have similar results leading me to think not a faulty RCBO but an issue further upstream...
  10. sythai

    Wireless/ App switching.... what do you recommend

    Hi All We've recently got a foot in the door with a decent garden company who are promising lots of work. There's been talk about wireless/ app controlled lighting, pumps etc. To be honest I've not been down this route just yet. Just seeing what makes any of use/ recommended please? Only...
  11. STM

    RCBO for Vynckier CU

    Hello all, Do any of you know if vynckier made RCBO'S, or if another similar brand RCBO fits a vynckier consumer unit. Had a little look on ebay, but not having much luck. Any help would be much appreciated. Cheers :)
  12. Lucien Nunes

    Recommend me a small CU with DP MCBs / RCBOs

    I need to go shopping in the morning for a small metal CU, about 5 outgoing circuits, but they have to be fitted with DP OCPD including some C-type. One overall RCD is OK but if I can get suitable RCBOs that is a possible. It's so rare that I fit a small single-phase board, I've no idea which...
  13. T

    Memshield 2 RCBO's tripping when using two way radio's

    We are going through a building (now unoccupied) to identify from old drawings and what circuit charts there are to prove what does what before safe isolation to do alterations and remove. We are doing this for the ground floor however the boards are in the roof area. To do this we are using 2...

    RCBO with Functional Earth Lead.

    I have read somewhere, (but I can't locate the source), that because the RCBO's electronic control operates at a very slightly higher potential than earth, there is a very small leakage to earth through the functional earth lead. Is this correct or is my memory playing tricks?
  15. polo1

    RCBO for Wylex NSB range

    Hi peeps, anyone know if the current Wylex standard size rcbo will fit a board populated with the NSB range of mcbs? If not, anything that does? TIA
  16. K

    RCBO Tripping

    Hi all, new here, looked over the forums and on google couldn’t find much Info. I have a consumer unit where the sockets, cooker and shower are protected by an RCBO. I had to replace to sockets with ones that have built in USB. So switched off the MCB for sockets (as you would) I would have...
  17. happyhippydad

    Does this proteus RCBO fit this board?

    Morning all.. As in the title does the RCBO below fit in the proteus board shown in the second picture. I'm sure it must do but I just wanted to be 100% sure before I turn up to the job. Also, in case I buy a different proteus RCBO, do they all fit this board? The reason I ask is because...
  18. R

    Domestic RCBO trips different RCBO

    I've just change a CU and installed RCBO's. There is a 32a SP RCBO suppling a ring final circuit. There is a 6a SP RCBO radial lighting circuit. When the 6a radial circuit is energised the 32a RCBO trips. With the 6a dead the 32a stays in. I expected to find a shared neutral but there is no...
  19. A

    Domestic Questions about choosing RCBOs

    Hello, I have been reading the topics on this forum which have been very helpful. I am looking to change my consumer unit to a full RCBO unit - I am not going to fit it myself, I am just trying to gather knowledge as to what is available so that I am informed as to choice. I have gathered that...
  20. T

    Used Rcbo's Yay or nay??

    Been asked to carry out some bathroom work including new spots, underfloor heating etc. The existing DB is an old Square D board with no rcd protection at all. Customer wont pay for a new DB, and ive priced a drop in rcbo....... £177 each. Passed this info on to the home owner, and hes...
  21. M

    Domestic Consumer Unit - RCBO Upgrade??

    Hi all, Looking some electrical advise. I've been told by an electrician that I need to install 5 Nr RCBO's to this consumer unit. Is this correct or is the current set up ok? He has provided me with a condition report stating a 'C2' on the cables concealed in walls. If an upgrade is required...
  22. T

    Domestic Price of Hager RCBO's

    Does anyone know what a good competitive price I should be paying for the above?
  23. C

    Interesting for rcbo’s

    From the code breakers book,which is a good buy,no mention of the 1667 ohm readings,my thinking if it don’t comply to the Zs measurements,then it don’t comply. No more sticking a Rcd on that circuit,that’s if anybody does,to protect it .
  24. M

    Wylex Type A or above rcd/rcbo... where to find them?

    I'm a bit stumped, feels like I'm hunting bigfoot. Anyone know a supplier for these?
  25. Andy C

    Domestic TT earth, Dual RCD or RCBO and Main Switch

    I have a replacement consumer unit coming upon which is currently off a TT system with a nice low reading on the earth. There is no chance of the DNO converting to TNCS. No SPD or AFDD as per client. I intend fitting a new Dual RCD consumer unit. I have researched this site and there was talk...
  26. GBDamo

    RCBO socket circuit tripping.

    I'm stuck here fellas. I have a radial with only one double socket outlet in 2.5mm T&E on a 20A RCBO running five meters in surface mounted trunking. TN-S, R1 and R2 good, 243V measured, Ze 0.12, Zdb 0.29, Zs 0.36, IR all +200MOhms. RCD trip tests all ok at 0 and 180 and ramp 24mA. Now these...
  27. P

    Best RCBO consumer unit

    Hi everybody. In the not too distant future I would like to get my current consumer unit replaced. I want to select the brand for my electrician as I’m a pain and like to research things. I was looking to see whether my thought process seems reasonable so would welcome and appreciate any help...
  28. L

    RCD RCBO over current

    Hi, I know the basic differences between MCB, RCD and RCBO. I was wandering what happens to a RCD if the current reaches the RCD's limit? Why do RCDs have got ampere rating if they don't protect against over current? In case of RCBO, how do I know at how much ampere they shut down? Is it the...
  29. MarkRibbands

    6kA (Not 10kA) RCBOs in commercial TP boards: Why not?

    I'm fitting two replacement sub-mains panels as part of a long-term upgrade from split-phase to three phase on a part-domestic part-commercial site (my own gaff). I'm using all RCBOs because I like them, but am less keen on the cost of the commercial variants ... Fellow spark says one MUST use...
  30. littlespark

    RCBO to fit Seimens Stratum200 DB

    I'm looking for a 32A RCBO to fit an old Seimens Stratum200 DB. I'm going to be doing some work in the kitchen first, then replacing the DB later in the year before other works. If its another make, it wont matter for the short time its going to be used. Same reason for not installing a...
  31. Nuno Gomes

    MCB/RCBO/RCD/Fuses - Periodic inspection

    Hi guys. A quick question. - When people do periodic inspection, is it considerad a defect on the intalation if the Protective diveces are no from the same brand? - In a TP instalation using fuses should the 3 fuses be from the same brand? I´m almost sure that I've herad that during my...
  32. Bobby34

    TT system, RCD or RCBO

    At the risk of asking a silly question could someone advise me on the following: Client has a TT system with only half the circuits covered by an RCD, they want a light adding on a light circuit thats currently not covered by the rcd. Now with half circuits not going to meet the disconnection...
  33. Crumps

    General RCBO installation

    Hi all I work on site as a contractor and my colleague was talking to one of the in house electricians on site. He does some work of site for somebody else and the conversation turned to RCBO installation briefly. My colleague stated he was installation last week and this in house electrician...
  34. E

    Class A RCBOs - list of manufacturers

    I'd find a list of manufacturers who are currently producing single module class A RCBOs (and perhaps class A RCDs) quite useful. To my knowledge so far there are: Hager Doepke Schneider Does anyone know of any others?
  35. 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...
  36. E

    Electrician Changing garage Mcbs for Rcbos

    My garage has a small consumer unit fitted with elcb and mcbs for the socket and lights. After cutting through a circular saw cable it did not take out the garage elcb but the elcb in the house consumer unit. If I get an electrician to changed the mcbs for Rcbos would this prevent the house elcb...
  37. rolyberkin

    How to save money on costly rcbo's

    Well this is a new one on me, new build, very expensive large house, 1 x rfc and radial crammed into in one 20amp rcbo x 2 and multiple circuits in the three 6 amp rcbo's?
  38. rustynails

    Domestic RCBO tripping next door RCBO

    Testing an RCD on one rfc upstairs tripped the upstairs and downstairs circuis, which was the RCBO next door to it. Turned off the power to all circuits tested downstairs RCBO on its own RCD failed 1x and 5x tests. Disconnected conductors from this RCBO tested RCD at the board worked ok. Put...
  39. S

    When testing a circuit protected by RCBO, do you test at the DB or furtherst point

    Hi, I just have a few questions in regards to testing an RCBO circuit Is there a requirement to test at either the furthest point or the DB or is it down to the testers discretion. Do the test results differ? What tests on a circuit will trip the RCBO when you are away from the DB. Is it...
  40. J

    RCBO - What would happen if I didn’t connect the neutral of the RCBO?

    Please can someone tell me what would happen if the neutral of the RCBO wasn’t connected would the circuit still work ?
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