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  1. N

    Why does RCD trip when measuring voltage with LoZ function?

    Why does RCD trip when measuring voltage with LoZ function?
  2. A

    power fed light switch Hager rcbo won’t trip

    Power fed light switch and all lights test great, as soon as we put the dimmer switches in the Hager rcbo won’t trip, any ideas please
  3. C

    Why breaker didn't trip:

    I work in maintenance for a major chemical company. We had a water softener line break above a compressor. The disconnect for the compressor was filled up with water. (There is a window in the front of disconnect) We could see the water boiling inside the disconnect until we shut off the...
  4. S

    How to properly do an RCD time trip test

    I've seen several videos on these, half of them show an MCB in the 'on' position protected by an RCD also in the 'on' position, earth lead on the earth bar, neutral on the neutral bar, and live on the MCB's line screw terminal. But then i've seen other videos where the earth bar and the...
  5. A

    En suite lighting not going on .

    Guys looking for a bit of advice. Our Mcb on the consumer unit was tripping constant even though nothing was plugged in. Both bedroom lighting and en suite lighting come under this MCB. However until recent both bedroom lighting remain on and the mcb doesn’t trip but the en suite lighting won’t...
  6. CTJXtan

    ELCD trip at my office. need help

    I live in Malaysia and this happened to the office i'm working at. There's a MCB that controls the light in room A and the stairwell. Either the MCB or the ELCB will trip randomly even though no one is playing with the switches. I tried to troubleshoot it myself. So far the situation is 1. The...
  7. S

    Eco Wurx VO Shunt Trip Wiring

    Hi all, I have installed in my home a Voltage Optimiser. It has Chint breakers and a S9 Shunt Trip installed. I cannot find out any info on this thing. I'm looking for a diagram as I noticed it isn't working. I looked around it and found a loose neutral from the coil. I don't know where is goes...
  8. Qwe7410

    How to keep power trips isolated and not trip the whole place when testing faulty appliances?

    Having some 1400W 230V heaters to test and repair that have a power trip problem. I've unplugged all the connections and open them up one by one to identify the part that is causing the trips. Everytime it trips, it trips the whole place through the main circuit breaker. How can I do it safely...
  9. T

    Do Breakers trip on irms(total)

    Hi, Say i have a 16A load on a Mains 16A circuit at 230VAC. If its not power factor corrected, then is there a danger the breaker could trip? (due to the reactive current being high aswell).
  10. P

    Thought I found a nuisance trip but I didn’t. Any advice to my questions...?

    So a customer had a nuisance trip and I spent 4 hours trying to find the fault (first hour identifying circuits as none labelled at board). There was a ring circuit with each leg being fed by 32a breaker, I put them into the the same breaker. Another ring had its leg connector blocked...
  11. Davew182

    Why would an RCD trip 3-4 minutes after a light has been turned off?

    No lighting has been changed in the house for at least 12 months. Last night a small pop similar to that of a small firework in the distance came from one of the rooms in my house and the rcd for the front of the house ceiling lights tripped. This happened within a few minutes of me turning off...
  12. A

    Laptop Power Supplies Trip RCD

    Hi, The RCD which protects my 16A ring main always "trips" when I plug/unplug a Laptop power supply. No other type of appliance causes a problem. I have 2 laptops with the external power supplies on leads which both cause this problem. I also have a similar 240v to 12v switching adaptor for a...
  13. R

    Earth leakage high on oven but no trip?

    Morning, Customer has a intermittent trip which I am trying to locate. 4 circuits on rcd. Two rings , cooker and hob and one I cannot find actually powers anything as yet. Rings test fine and cooker circuit is okay continuity and I/r. I have put my earth leakage clamp on tails and when I go...
  14. M

    Difference between ON and OFF intervention in the tsd of an ACB trip module

    Hi All, I'm trying to learn about discrimination and I came accross the LSIG characteristics of an Air Circuit Breaker. Howecerm there is something I really cannot understand about the Tsd. What's the difference between ON and OFF in the intervention? Thank you in advance
  15. B

    Shunt Trip Breakers

    Hello, Ill start by saying i am NOT an electrician. I do own a small business installing commercial kitchen exhaust systems and fire suppression systems. I assist the electrician on site normally in wiring the Fire system and alarms. I recently heard of a shunt trip breaker. In the past, and on...
  16. Msitekkie

    Why does RCD trip when fused spur switched on

    I was called out last night to an RCD trip issue. I found that switching on the fused spur to the washing machine would cause the trip & I could only reset the RCD after switching it off. Straightforward up to that point, but after unplugging the washing machine, then disconnecting the spur...
  17. S

    Could this socket be causing circuit to trip every 3-5 days?

    Hi, I've been getting my house socket circuit tripping about twice a week. We only moved in about 3 months ago. I've been going around checking all the socket connections and today came across this one in one of the bedrooms. It didn't have the neutral fixing screw tightened so I've secured that...
  18. B

    UK New smart meter, storage heaters now trip RCD

    I have just had a "smart" meter installed , and at night the electrics trips the RCD when the night storage radiator section comes on. I have had them out and they said installation was correct. I know a little about electrics (more over cautious and basic) but was suppressed when I looked at...
  19. mc1903

    Intermittent RCD tripping. Benefit of changing over to RCBO's?

    Hi, We have recently had some electrical work completed in the house to add a new circuit for air conditioning. We are now experiencing intermittent RCD trips, at all hours of the day and night, in the section of the consumer unit that the new A/C MCB was installed into. No MCB's trip - just...
  20. B

    TN-S High Ze measured 3 wire no trip.

    Hi knowledgeable collective. To the chase. TN-S Megger 1553 2 wire Ze 0.09 but was getting Zs on cooker cable 1.5 metre long using No trip 3 wire got 33.4ohms So went back through system right to isolator post meter and was still getting 33 ohm reading. So 2 wire uses higher current so might...

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