trip

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  1. S

    Strange MCB trip

    Hi all, Had my downstairs ring final circuit trip the B32 MCB today. The missus was in the kitchen cooking and had apparently put the kettle on and as it was close to boiling the MCB tripped. I therefore assumed it would be due to the kettle so I checked the 13A fuse in the kettle plug but it...
  2. S

    My MCB is ON but no current.

    Hello, In my kitchen, I make multiple sockets that are controlled by one MCB. For some weeks, I don't know why the MCB used to trip and I used to turn it back ON. One day the MCB didn't go to the off position but all those sockets stopped working. I pressed the test button on the particular MCB...
  3. M

    How come some rcds dont trip when testing voltage to earth

    So I recently installed a new circuit to my loft as a dedicated burglar alarm and cctv circuit. When checking polarity and voltage with my test lamps/voltage indicators it didnt trip the rcd when testing live to earth and neutral to earth. It's an rcbo which works when using the functional test...
  4. J

    UNUSUAL RCD SWITCH TRIP

    My RCD switch trips at the most unsual times, it will trip at 3am (no electric items are plugged in bar the kitchen appliances) then i will reset it and it will trip again at 10pm the next evening. It also tripped at 7:15am this morning. Electricians have been out and tested all my sockets and...
  5. N

    UK RCD Trip - insulation problem from too much load?

    Hi guys, first time poster, be easy! I'm caring for a friend and last night while sleeping on the sofa-bed an emergency system that had lost power was sending out a warning signal. Startling to say the least. The RCD had tripped and after some internet sleuthing I managed to isolate the...
  6. wsoppitt

    What sequence to identify intermittent fault causing rcd to trip .

    Guys / Girls. How do you tackle an intermittant fault that only occurs once or twice every few weeks. What is the sequence you would use to identify and locate the issue.
  7. Pretty Mouth

    Series arcing causing MCB to trip

    I recently fixed a fault on a lighting circuit. The fault became apparent after some work I had carried out - I rewired part of the circuit for an ensuite refit, plus some additions to other circuits supplied by the same CU. I needed to provide RCD protection to the circuits that I had worked...
  8. tank

    Main breaker trip

    Hi guys, why might a fault on a final circuit in an apartment trip the dp c63 submain circuit breaker in the plantroom but not any mcbs on the consumer unit in the apartment?
  9. littlespark

    Strange fault. Time delayed mcb trip.

    Fault finding. Good to systematically and logically investigate the problem, then the culprit has been staring you in the face... phone call from new customer- no power. get there, split rcd board. “It’s that big switch that won’t stay up”, says the woman Ok, the rcd. Unplugged everything I...
  10. OnlQQker

    So How Come A 30ms Rcd Is Supposed To Trip In Ms..

    Yet when you accidently touch it with human hands it is way longer. I've done this a few times in my clumsiness and it certainly does not trip in milliseconds! Just wondered what anybody else thinks.
  11. A

    Consumer unit trip

    Hi I would be very grateful for advice. I have a circuit breaker in my consumer unit marked B6 which is for lights. It covers lights in 3 rooms. A friend has been looking after our house for couple of weeks and called me to say that the lights wouldn't come on. I have returned to find the...
  12. L

    Why does GFCI trip when running 110 and 220 through same conduit?

    I am currently working on wiring a hot tub. I currently have a 50a subpanel with 2 breakers(2 pole 30A and a 1 pole 20a). The wires I am using to run to the tub are THHN wires and are 10awg for the 220v, and 12awg for the 110v. The heater for the tub runs on 220v and the circulation pump, jet...
  13. K

    Rcd tripping from new 3hp tablesaw

    I have a 40amp trip on my main consumer unit feeding my workshop where I have another consumer unit with 1x6 amp 2x16 amp and 1x32amp trips. I've replaced my old 3hp tablesaw that was run from a 13 amp plug on the 32amp ring with a new 3hp one that is plugged into a 16amp socket through a 20amp...
  14. M

    UK Advice on testing RBOS in prison

    starting to test in a prison. does anyone know why the rcd trip test does not work when done directly on to the rcbos
  15. happysteve

    What would give a low N-E resistance (at DC), but not cause the RCD to trip?

    I'm familiar with RCD spurs giving readings of 0.1 to 0.3MΩ when testing insulation resistance (L+N tied together to E), but what would give a reading of about 65Ω (when tested with "low resistance ohmmeter" i.e. continuity setting) N-E? On a lighting circuit - N isolated from other N's...
  16. D

    No load fuse trip but not RCD.

    I awoke to find half of the circuits had tripped on the RCD the other day. So I when I reset the RCD and then turned off each fused circuit and turned them back on in sequence to find which one was tripping the RCD. Turns out it was the first floor sockets ring circuit which has a B32 MCB which...
  17. D

    What happens when current flows through the earth? Does it trip?

    Supposing I fit a metal light fitting, and I do a terrible job - and the live comes out from the terminal screw and hits the fitting, but it's well earthed - current will flow through the earth cable (hopefully) providing a circuit with less resistance than if I touch it. When this is happens...
  18. T

    No Trip 2 Wire MFTs

    Hi folks, my Fluke 1652 has finally given up. I need a replacement quick. I want to try and future proof the purchase a little by making sure the replacement does 2 wire no trip testing. Do any of the current Flukes do this? What are the options these days? I'd not given any thought to it all...
  19. S

    High no trip earth loop readings

    Hi, I'm buying a new test kit and was wondering if anyone had a problem with non trip earth loop readings? This was taken on the same installation- new mk sentry split load rccb CU. I've got a secondhand, calibrated megger 1711 MFT which I've taken readings on a ring = 1.04 ohms And...
  20. E

    Load on non RCD side, causes RCD trip

    Hi Looking for advice on a intermittent fault. New dishwasher is causing RCD to trip (happened with two new dishwashers - supplier changed it for me). Thinking therefore it was an issue with the ring main, I plugged it into the cooker socket but it still trips at some point during the...

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