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trip

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  1. M

    sub main supply time delay trip 100ma 100A s keeps triping

    Hi Can anyone help ? i have a job where there is a tt supply and a swa sub main feeding a dist board with 13 final circuits , each final circuit is protected by a RCBO , all rcbos ok and not triping but the time delay trip seems very sesitive and keeps triping out , it tests ok no trip at half...
  2. cliffed

    Mcb trip

    Any ideas on this one,arrived at college been working at,they had a power cut during the night,which messed up a load of things that needed resetting.At one area of the college at a DB a mcb rated at 63 amps had tripped,this supplied another DB supplying ring mains for IT suites,about 12 rings...
  3. R

    rcbo trip question

    Been testing today on a new installation, it was a lighting circuit all lighting weird via click roses. Came to the rcbo test, trips on 5x at 100ms then says plus 40 on 5x. Quickly swapped out rcbo thinking it was just faulty and does same again with the new one. Some rooting around in loft i...
  4. J

    Can RCD/RCBO trip if no cpc is installed?

    Good morning, :) I saw lighting circuits done with 2-core cable (red-black) with no earthing conductor. I was wondering in a case of an earth fault is the RCD/RCBO going to trip? I think if a metal switch or a chandelier becomes live, the RCD/RCBO won't trip due to the missing cpc! But is it...
  5. J

    Nuisance Trip

    Hello to you all I am a new member so please gentle with me. My background includes an apprenticeship taken many years ago and following many opportunities I became a Service and Installation manager. To save on wear and tear of this ageing frame I have decided to return to the tools (domestic...
  6. Q

    Transformer causing mcbs to trip

    Hi. Could someone confirm weather you think I'm right or not. Today I installed a ceiling mounted suspension wire lighting track in a domestic kitchen. It's fed via a fairly chunky wire wound transformer (I don't know the kva of hand). The mcb supplying the circuit is a type b 6 amp rcbo...
  7. R

    Can 2 way radio trip RCBO'S

    Good evening, Does anyone have any experience of RCBO's tripping when using 2 way radio near the DB.
  8. A

    0 Megohms N-E and no RCD Trip

    Hi All I was re-testing a brand new install for QC purposes todayand the N-E on the IR was 0 Megohms, am I right in expected the RCD to trip. Itwas a TN-C-S system so wondered if the shared neutral and earth may have aneffect? The IR for L-N and L-E belled out perfectly, I haddisconnected both...
  9. J

    10 second trip

    Tested some out side lights today and it triped after 10 seconds. With all loads disconnected. Don't understand why it would trip after 10 seconds. Had a slight short on the cable of 95k ohms Any ideas
  10. A

    Heating element earth trip

    Hi, Can a heating elements resistance to earth depend on its temperature? As I have one here that trips the RCD but when checking the resistance cold there is around 1.5M ohm-7M ohm to earth which shouldn't trip a 30mA RCD. Putting pressure on the element doesn't change it and there aren't...
  11. K

    Cylinder stat seems trip rcd

    Hi, My heating system is a myson apollo 30b with a 3 way valve etc. The other day wife said was a popping noise coming from kitchen where the programmer and boiler is , on investigation i have found when you turn down the tank stat which is a drayton hts 3 it when it gets below the temp and...
  12. J

    test & inspect tripping when doing zs on not trip

    Hey all, I'm playing with my new Metrel mi3000 and using my parents house as a quinea pig. So if you see in the pic it has the main/rcd switch as a cutout and when trying to measure the zs my little Metrel trips it every time (tried on non trip and normal). I have my R1+R2 and ze so can...
  13. S

    Motor trip

    Handed a job this morning; 30kw motor. 55A. Circulation fan on 220°C toaster. Star-Delta setup with thermal overload in at Line contactor. Overload at 40A. D80 mcb tripped. Motor tested and found with negligible IR. Bearings 'lumpy' but felt a lot worse. So... overload should have been set...
  14. S

    RCD trip out

    I've been called to a job for a friend as his swimming pool pump keep tripping the RCD, it took me a while to work out how the other electrician had wired it but of what I see, it's a bit of a mess. I'll do my best to explain for the pool I can see 3 MCB's used 1st is a 6A type b in to a time...
  15. J

    RCD trip after board upgrade. Frustration who on my side? Who's on landlords? A rant!

    My mrs recently new bezzy girl mates partner has some property, my mrs said, " my hubby do it for ya at a good rate " joy i think. I had this gut feeling, you know the one! My mrs and her mate have been looking to get us two men friends, there was even talks of going camping, err don't think...
  16. N

    Why do lamps blowing trip RCDs?

    ...cos if the lamp is in effect Class II with connections only to L and N (Edison screw; standard bayonet cap in unearthed pendant or batten), you would naively think there is no way the L and N can be in imbalance. But still the RCD trips. Definitely talking RCD trips here not MCB. I've seen...
  17. S

    rcd trip y

    hi i was on a fuse board change to day and the new fuse board was switch off and no buzz bar connected and no tails connected but 1 of the circuits which was a radial to the kitchen when you put the neutral in it tripped the rcd can any 1 tell me why :lightbulb:
  18. A

    30ma trip on split board

    Any opinions on replacing a 100a main switch with 30 ma TVs, I'll have to move the internal tails from the bottom off the rcd to the top I know but is there anything to say I can't? Or just use rcbos
  19. G

    RCD both tripping and refusing to trip!?

    I have been away from a refurb job while other (inc. the owner) have been in and on my return I found that the RCD (for a cooker circuit and three power circuits) is tripping. It triped even when a fairly basic piece of equipment such as my makita drill charger of the owners kettle was plugged...
  20. H

    Trip readings too high on ground fault relay with Toroid sensor......Help?

    Hi there, Have been carrying out testing on some 3 phase sub-DB's that have outgoing supplies to 3-phase DB's for accommodation blocks. My problem is to do with readings I'm getting on a ground fault relay which has been set to 300mA. Basically, the incoming cable to the Sub DB ( 4-core 25mm...

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