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  1. DomB78

    TYPE C RCBO Fails to trip on 1 Times RCD Test

    Hi Can anyone help ? Recently fitted 2 separate Eaton 32a Type C RCBO, on the RCD test it fails to trip on the 1 times test and gives result as >400ms. It trips fine on 5 times test in 7.1ms. Using Megger 1552. They are fitted on 2 new 6m2 radial circuits with Blue commando sockets. IR results...
  2. D

    Timed outdoor lights trip..then they don't?

    Hi all, New to this forum. I have a weird scenario and wondered if anyone might be able to help. I have a Grasslin timer socket switch (not digital) in my garage. This powers 4x lights outside my house. I have 70 Watt bulbs in each. When they are set to come on, at 6pm, it trips the...
  3. Dave Jenkins

    Why are the RCD trip times for I and 5I 300ms and 40ms

    Is there any particular reason why the trip times for RCDs at I and 5I are the values they are (300ms and 40ms). Is there some particular medical reason why?? I'm just curious, no particular reason but may weave that into the conversation next time I'm in the pub!!
  4. littlespark

    What can cause an invertor to trip the MCB?

    When visiting my parents, I noticed their PV invertor was showing zero W generated. On inspection, I found the MCB had tripped. Is there any reason for an invertor to trip it? Powercut, or power surge? The PV system is rated 3kW, and the MCB is 20A, type C. We checked back the history on an app...
  5. D

    Deep fat fryer causing electric to trip

    I have a Tefal 1000 deep fat fryer. It is the first time I have used it. Was given as new a few years ago. I used the same outlet as I use for the kettle 2200w and a microwave 700w. The Tefal was on for around 30 seconds and it tripped the RCD in the house electric. Kettle works fine and also...
  6. 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.
  7. 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...
  8. 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
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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
  15. 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...
  16. 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.
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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