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  1. P

    Complex motor start cuasing RCBO to trip problem

    Hi All, well I did have an IR test scheduled but I have just cancelled it. What I didn't mention was that the annex in question is rented out as a holiday home - and I really would prefer to not disturb them. I'll wait until november when we may have a spare week. Also, I followed advice...
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    Complex motor start cuasing RCBO to trip problem

    Darkwood: Many thanks for the long explanation yesterday. I've now read it in detail. A couple of points: 1. FYI an adjacent property had a problem whereby use of a large flymo in house A cause RCD to trip in house B. (Mine is house C). A little like the scenario you mention. 2. You say...
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    Complex motor start cuasing RCBO to trip problem

    17th edition regs unfortunately. It is fed with T&E which is behind plasterboard and within 3cms (?) of the surface and is not otherwise mechanically protected. Unfortunately!!!
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    Complex motor start cuasing RCBO to trip problem

    Tony, biff55: I'm afraid that I disagree. Yes VSD do present a challenge. I have researched them on the net quite a lot. I talked to the manufacturer yesterday. The challenge they present appears to be due to the particular waveform they generate and perhaps common mode noise. NOT simple...
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    Complex motor start cuasing RCBO to trip problem

    Def not the pumps fault as if plugged into a totolly seperate building - or even the main CU of my own - it all works fine. I cannot get over thinking it is somthing to do with the earthing of the annex. However - I will read your essay - slowly and soberly tomorrow darkwood. Thank you VERY...
  8. P

    Complex motor start cuasing RCBO to trip problem

    It is an interverter driven motor. Motor is three phase. Phases developed from an inverter. Speed is controlled from adjusting the frequency. HOWEVER, I am luck that this shows the fault every time. Before I had this puimp I STILL HAD THE TRIPS - just completely randomly. I assume this was...
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    Complex motor start cuasing RCBO to trip problem

    Darkwood: I will try the heavy load (eg 3kw heater). I will put the checking all connections on the electricians list (as well as an insulation test). Please can you explain the temp set of tails test? Just so as to utilise his time well. Meanwhile - you really shouldn't keep us in suspense...
  10. P

    Complex motor start cuasing RCBO to trip problem

    Interesting question: It is about 60yds from the annex but about 40 from the house. However electrically it may seem rather nearer. Let me explain. Transformer 3 wires (can clearly see L, PE, N) going 30yds to a post where the armored cable attaches. Then about 40-50yds of cable to the main...
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    Complex motor start cuasing RCBO to trip problem

    They did ramp tests of everything. They did various Zs tests. They discovered I have 1V between earth and neutral and pondered that for a while. They tried disconnecting things. They changed out the RCBO and then back again. The last one was just about to do insulation resistance tests -...
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    Complex motor start cuasing RCBO to trip problem

    Tony: You may be right - but I've done that twice .. and paid for 2 x 1 days rate with no appreciable advantage. If possible I want to be able to present any electrician with the 'smoking gun' so that he can take remedial action.
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    Complex motor start cuasing RCBO to trip problem

    Thanks everybody for their help. I will go and do some more tests and repost the results in a few days. Hopefully they will show a smoking gun ... though I suspect not......
  16. P

    Complex motor start cuasing RCBO to trip problem

    monkeyelectric: I have an AC ammeter which I can insert into the earth lead of an individual applicance. I also have a device which does a similar job to a ramp tester. (It is a decade resitance box. Just keep adding in 1mA until it trips).
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    Complex motor start cuasing RCBO to trip problem

    Snowhead: I agree that would seem logical. And I thought that for a while as well, however I cant square it with my observations. The total leakage of all annex connected equipment (excluding pump) is about 7mA. The leakage of the pump is zero (unless it is more at startup). The leakage of...
  19. P

    Complex motor start cuasing RCBO to trip problem

    No - it cant be overcurrent because of the experiment I did where: I have a 13A socket fitted near the RCBO and connect to it. If I pull the DP isolator on the annex CU it works here fine. Same RCBO, just with annex disconnected. Purely from experimental observation, it is something to do...
  20. P

    Complex motor start cuasing RCBO to trip problem

    Wylex RCBO B50 30mA NSBS50-B/1
  22. P

    Complex motor start cuasing RCBO to trip problem

    Wow - 4 replies within 2 hrs - thanks very much!! I'm afraid I forgot a little bit of information: When I plug the pump into a regular ring main in my house (connected to an RCD) - nothing happens. It just works. From this I conclude that the pump itself is not actually at fault - it just...
  24. P

    Complex motor start cuasing RCBO to trip problem

    HI, I have a difficult to diagnose problem. I've had two qualified electricians try and sort it, but no solution yet. It is tricky (interesting?) and would love to hear comments/suggestions. I have a long barn conversion. Supply enters one end into a CU. There is a 50A 30mA RCBO feeding a...

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