trip

  1. S

    TT Ze reading- loop high or loop no trip?

    When measuring Ze on a TT that's RCD protected which is more accurate? Getting 27.1 on high current but 563 on no trip.
  2. N

    EATON MCCB Trip Parameters

    I am to replace an old MCCB with a new Eaton one, the circuit feeds a few boards and the current rating for the circuit is 160A. What I'm trying to understand is the 4 trip parameters that you select yourself on the breaker. These are: IR - Continuous current setting (A) tR - Number of...
    • n_gunter
    • Thread
    • circuit current delay eaton setting short trip
    • Replies: 3
    • Forum: UK Electrical Forum
  3. D

    single phase into 3phase trip switches/contactors etc

    Can I wire single phase into 220-240V 3phase trip switches/contactors etc. What I am trying to do is protect a 220v-230v encoder but want the earth wires to look neat. professional looking. Please see picture below
  4. P

    Lighting Circuit Trip Problem

    Hi Guys Help! The 6 amp MCB for a downstairs lighting circuit keeps tripping, sometimes instantly, sometimes slowly. An IR check live to earth gives >200 Meg on the 250 Volt range (I don't want to blow up the dimmers!) when all light switches are OFF! This reduces to near short circuit when you...
    • Piratepete
    • Thread
    • circuit fault lighting lighting circuit neutral problem switch switches trip
    • Replies: 12
    • Forum: UK Electrical Forum
  5. A

    Oven Tripping, but only after use

    Hi, I'm new to the forum and to electrics in general, trying to study and get qualified and get practice where I can. One of my friends has asked me to help with his oven, which has been tripping the whole CU, but only after he's cooked in it and opens the door. Apparently someone looked at it...
    • Asa Owens
    • Thread
    • after oven trip tripping
    • Replies: 15
    • Forum: UK Electrical Forum
  6. michaelw6

    commercial industrial zs mccb 3phase question TN-C-S.

    Im specking a large 480a cable over 160m ive done cable calcs and come up with 2x 120mm 70c armored. now Im trying to work out my max zs...with no avail. my main ze is 0.17 but my mccb is saying max zs of 0.054 and my mccb will not trip... why is it so low? its impossible to get my zs less than...
  7. gijno

    Shower circuit breaker trip after use...

    Hello, this morning I was having a shower with really really hot water. Shower lasts at least 15 minutes... at the end shower circuit breaker tripped. It does not work any more, when I try to switch it on, it does not "keep the position". I have a brand new circuit breaker, bought some time ago...
  8. D

    Create a safe switch that will trip RCD

    So hi everyone, i have alot of electrical items in my room upstairs. And if anything were to fail i would like a switch that would turn everything in the house off. If i were to have a red emergency stop button (normally open) and connect it to a plug so that the ground wire and neutral connect...
    • Dean Longstaff
    • Thread
    • create rcd safe switch trip
    • Replies: 34
    • Forum: UK Electrical Forum
  9. F

    light switch trip socket breaker

    Hi Sparkys! one to scratch your head with: randomly one switch light trip the rcd sockets on the board? have a look at the pic if it helps.. thank you Fab
  10. vxwestie

    6amp RCBO or Mcb that doesn't trip everytime a bulb blows

    We all know the side effects of a normal 6amp MCB operating more times than often when a bulb blows (especially gls or candle lamps) but has anyone ever tried to to eliminate or reduce the nusience tripping? I have an elderly client with a 4way rewire able fusebox and I need to change for either...
  11. D

    Wanted: Terasaki shunt trip and alarm contact

    Just in case anyone here has such things I am looking for a shunt trip and alarm (trip) contact for a Terasaki Tembreak XS400 NJ mccb. Please PM me if you would like to sell me such items.
  12. D

    RCD Trip

    Just put a Split Board in my own house (a bit of a upgrade going on) and a problem with one of the RCD's. Last minute post this and stopped work for the night. I have not done any fault testing at the min, as having a relaxing Friday drink. However Fully weird every thing but with the...
  13. D

    random rccb trip

    Hi guys, first off im not a qualified electrican but i am a qualified engineer and very competent, also assisted a few rewires to help a friend start a buiseness a few years ago. So to the point. I recently bought a new house and its had a full rewire as all the cables are new colors and it...
  14. J

    Student BS60898 Type B trip question

    Hello I'm a Level 2 electrical installations student and I have a question about Type B BS60898 circuit breakers. I've been revising tonight and have noticed that the trip time on these is 3 to 5 times the rated current. What does this mean? Say I had a 32A Type B would it trip over any...
  15. G

    RCD Trip x1 test no reading

    I was called to an office in a field today (tt system) The led lights and sockets (separate circuits ) still have power when switched off at the switches ( lights on dim and socket neon half bright) I did a ze test at the board and had to replace the earth rod. The reading at the board is...
    • geor1970
    • Thread
    • before fault rcd reading still test trip trips
    • Replies: 23
    • Forum: UK Electrical Forum
  16. 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...
    • markbriffitt
    • Thread
    • 100ma delay keeps main sub main supply time time delay trip
    • Replies: 8
    • Forum: UK Electrical Forum
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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