rcbo

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  1. B

    TN-C-S (PEN) RCBOs Discussion

    I'm currently planning for a CU upgrade on the domestic premises, and following previous advice on this forum, I was told that I should consider upgrading to a Type A RCBO CU. I have been doing a bit of reading and came across some confusing information, stating that an RCD would not work on a...
  2. M

    Square D SQOR RCBO replacement?

    Morning all, Does anyone know if there is a replacement part for this discontinued one? I’ve seen some second hand ones floating about on eBay, but if I can’t find a brand new alternative then I’ll have to change the whole board. I’ve sent Schneider an email almost a week ago and still haven’t...
  3. P

    What cable size and breaker would I need for two extractor fans in a public toilet? 1.5mm 3 core and a 20amp rcbo?

    What size cable for 2 extractor fans in a public toilet?
  4. D

    Oven RCBO tripping

    I've just installed a new kitchen consumer unit with RCBOs. The client says the oven RCBO is now tripping when it cools down. Any ideas what could be causing this?
  5. R

    If all circuits are rcd or rcbo protected max current 150mA why do you still have to install 16mm earth

    THIS IS FOR ELECTRICAL NEWS ONLY
  6. i=p/u

    Rcbo replacement fuse board

    a fuse carrier is broken in 6way mem board with no rcd protection , it makes sense to upgrade to rcbos like other boards in the installation.. My question is , I'm nearly certain there is borrowed neutral on the lighting circuits and he won't want a wire fitted from kitchen to landing to...
  7. Sonia Norman

    Rcbo tripping

    I came across something new today. When I removed the main earth to do ze the rcbo tripped. Put the earth back in and it's fine. Can anyone explain what is going on?
  8. S

    RCBO neutral fly leads to bottom of main switch?

    Hi, first post here! Just wondering on your thoughts on RCBO neutral fly leads being connected to the bottom of a main switch? Went to replace a cracked double pole switch for the storage heater, went to give it a quick test and came across this. Dual RCD board with an extra main switch added...
  9. N

    RCBO identification

    Anyone recognise what make/model RCBO are these ?
  10. HappyHippyDad

    will this newlec rcbo fit this newlec board?

    I need to get 30mA RCD protection to a new circuit I am putting on this consumer unit. I didn't take the cover off so I am not sure if there will be spare ways on the RCD side of it (wish I had checked!). It looks likely that there would be space, does anyone know if the RCD side of this board...
  11. LewisM

    RCBO Blew Up

    Hello I you are all well This is hard to explain but basically doing a three phase install and there is no power yet so I wanted to test two lighting circuits before the lifter went, I used an extension lead and connected live to phase L2 (that's what the lights were on) Neutral to the neutral...
  12. Midwest

    Global IR testing on RCBO populated CU

    I shall be replacing my dual RCD CU, for a all RCBO populated CU. A question or two about technique for IR testing. For the IR test, I've read here before that a global IR test is preferable. With older types of RCBO's that wasn't possible, without disconnecting cables, which ended up with the...
  13. tank

    Tie wrapping RCBO neutrals.

    Hi guys, if 16 RCBO neutrals are tie wrapped together for neatness, are there any thermal considerations such as grouping factors to be taken into account?
  14. S

    RCBO passes 30mA but fails 150mA but in a strange way. Any ideas?

    Morning everyone, this is my first post - although i had an account years before that seems to have been lost. Can any of you shed some light onto a situation I've come across. I have a newly installed RCBO which is failing the x5 test with a reaction greater than 40 mS. Now, I don't have a...
  15. OnlQQker

    So, Do Electricians Have Top Of The Range Consumer Units And RCBO's

    In their own homes I'm on about... I imagine they test the installation a lot as well?
  16. D

    Is it ok to do insulation resistance test on RCBO at 500v?

    I know you are not supposed to do a insulation test on circuits that are protected by an RCD at 500v because it may damage the electronic components inside the RCD so that's why you switch the RCD off before you test the individual circuits, however, what if the circuits are all protected by...
    • David345
    • Thread
    • dead test domestic testing fault finding insulation insulation resistance insulation resistance test insulation resistance testing ir test live test rcbo resistance test test and inspect testers testing testing and commisioning
    • Replies: 6
    • Forum: UK Electrical Forum
  17. JBW175

    UK Need an RCBO to fit an old Crabtree board, any suggestions?

    Hi all, As the title suggests, I’m after an RCBO to fit an old Crabtree CU. Was wondering if this style would do it? All suggestions appreciated, thanks in advance.
  18. Ian1981

    Rcbo neutral and functional earths

    Thoughts on this please, functional earth leads obviously showing signs of heat damage, the greenish coloured neutral leads compared to the blue ones are coloured throughout their length, maybe heat has caused this?
  19. Dartlec

    Siemens 5SX range RCBO or best match?

    Trying to locate a suitable RCBO for a Siemens board with (mostly) 5SX21 breakers in. They don't seem to make this range any more, though I don't think it can be that old. It rather resembles the older MK breakers and I believe Siemens provided some of the electronics for MK stuff. Busbar...
  20. J

    UK Three phase (No neutral ) EFLI testing on an RCBO

    Hi I have a MFT1553 Mega tester. Is there a feature on the tester to test 3phase RCBOs when there’s no neutral present? Pretty sure mot. Was wondering if i could temporarily connect a neutral on a Wander lead and use the three wire test method? Thanks John

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