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  1. L

    RCBO Neutral Leads bunched with Main Neutral in Main switch - C3 or C2?

    Hi all, Engineer carried out EICR and marked the above as a C2, I agree, the smaller cables could come loose easily as the terminal is mainly clamping the 16mm tail. Client said C3....
  2. A

    Freeing up space in consumer unit

    Hi guys Hoping you guys could help. I have an 8 way RCBO board with all breakers used for dedicated circuits. Ideally I would like to run a dedicated circuit to a new combi boiler I've had fitted rather than it be plugged into the ring main to prevent nuisance trips etc however as mentioned...
  3. S

    Schneider RCBO to replace MCB

    Hello, I am currently working on a project that previously utilises a charger for a battery system that is connected via single phase 240V AC mains. The existing charger has the 15A inlet running through a 1P 16A schneider MCB with the active line connected to the MCB (with earth and neutral...
  4. J

    Other electrician replaced RCBO with MCB

    Was called out to a car park where they had the lighting circuit tripping out. Fixed the issue by putting damaged cables in an IP rated box. However just realised that the electrician who came out before myself took out the RCBO and replaced it with an MCB in hope that it would stop tripping...
  5. albi

    RCBO tripping

    hello every one i have a problem. i have been called out to a commercial kitchen where the 16A b type RCBO keeps tripping when you turn off a 20A DP switch that controls two dimmers which in turn supplies 2 sets of heat lamps 300w x 5 halogen lamps and 250w x 5 inferred ES lamps. when the...
  6. L

    UK RCBO intermittent tripping advise??

    Hi Guys Just installed a RCBO board to replace an old Wylex consumer unit that had Bs60898 MCB's fitted and an RCD main switch customer supposedly hadn't had problems in the past (not quite sure thats now true) when I carried out the EICR I found a problem on the outside garden lights, so...
  7. T

    Fusebox RCBO trip / ramp

    Fitting a new CU today (domestic TT) and using "Fusebox" for the first time - 14 way Type A RCBO board, 9 ways used 5 spare. All good until testing RCBO trip times - 7 test perfect, but 2 (both 6A) tripping during half test, 1 @ 0 the other @ 180. All loads disconnected, tested again, same...
  8. EastCoastPete

    Domestic Pool Pump intermittent RCBO trip

    Hello All, Am checking a fault on someone elses install which is about 18 months old. Customer says it starts and operates ok then he stops to take a break ( it's a small pool with pumped flow to swim against), then tries to restart and the RCBO goes. So, I know it's hot when it happens but...
  9. T

    Rcbo failure

    Hi all I've just had 7 crabtree star breaker type a rcbos fail the half time on 180. I ordered replacements but they are the same tripping around 75ms. Just wondered if any one else was experiencing the same thing, it's only on the 6a rcbos. Making me doubt my tester tbh Many thanks
  10. T

    Best Rcbo board at reasonable price

    Hi all! As the title suggests,I’m looking for your recommendations on the best rcbo boards available at a reasonable price. Doing my best to move away from dual rcd boards, but a lot of customers just wont pay the money for Rcbo’s. Any recommendations very welcome.
  11. L

    Identifying an RCBO from an RCCB (or RCD)

    Hi, would like your professional opinion how to identify an rcbo from an rccd just by looking at it. For example, I have attached two photos, one the ABB (40A 30mA) is an RCCB and the other ABB (10A 30mA) is an RCBO. Supposedly they are both 40A 30mA, how can you tell which is the RCD from RCBO...
  12. K

    Lost power but NO RCBO tripped

    Hey all, First off, Merry Christmas to all :) Right, so I have had a really weird thing happen earlier today. We lost power completely to the whole house, I assumed something tripped one of the RCBO's, so went downstairs to check the CU, and notice NOTHING was tripped off? However there was NO...
  13. 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...
  14. 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...
  15. 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?
  16. 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...
  17. 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?
  18. 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...
  19. 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...
  20. 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...
  21. 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...
  22. 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...
  23. 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 :)
  24. 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...
  25. 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?
  27. 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
  28. 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...
  29. 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...
  30. 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...
  31. 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...
  32. 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...
  33. 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...
  34. T

    Domestic Price of Hager RCBO's

    Does anyone know what a good competitive price I should be paying for the above?
  35. 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 .
  36. 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?
  37. 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...
  38. 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...
  39. 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...
  40. 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...
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