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    Fault on Ring final circuit

    You had me worried there so I just went and removed the panel in that section of wall (which luckily was not glued to the stud - 2nd sight saved me). However, there are no nail or screw penetrations into the wall where the conduit is buried. But I can't help thinking the problem lies somewhere...
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    Fault on Ring final circuit

    Thanks liitlespark. Yes, I did move the entire ring across the CU to a different RCD to help eliminate RCD and MCB issues. I moved all six ends. It just tripped that RCD so very unlikely to be an RCD or MCB issue I felt. I had a spare 32A MCB on that side that I knew worked. All six ends...
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    Fault on Ring final circuit

    I will do an IR test. That is helpful. My amateur logic suggested that CPC was unlikely to be at fault as the resistance r2 was as expected vs rn. It now transpires that although the CU has upstairs sockets on a different RCD to downstairs sockets according to the labels, the reality is...
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    Fault on Ring final circuit

    Thanks all. The real world vs "textbook" is something I have no experience of in this field. The meter I have is a Megger MFT1711. I also have some Kew sockets that I can fit to sockets and plug the Megger into. To a degree I am having to gain experience in how to use this meter as I go...
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    Fault on Ring final circuit

    Thank you. Not sure I understand. There is nothing plugged into any socket. Live, neutral and CPC are all disconnected currently from the CU on both sides of the ring. r1 is 0.96 ohms vs rn at 0.75ohms, which is more than suggested 0.5 ohm tolerance (as I understand it). As r1 is higher than...
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    Fault on Ring final circuit

    Please advise what I should test / check next. My usual qualified electrician who did all of the work here is in Ireland for 4 weeks and not contactable. I need to fix this asap. Ring final circuit tripping. I am not clueless and I have some test gear. Can fully isolate the supply with an...
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    Oven Replacement - RCD?

    I am a specifier, who employs electricians, and I am familiar with the regs. My actual background is lawyer. Perhaps professionals are looking at this (including AFDDs) the wrong way. What I say to myself is "the manufacturer has recommended this, it is also strongly advised (at the least)...
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    Do we have to fit AFDD's in domestic installations?

    An architect friend of mine is just doing a large thatch extension on a job. He's specified AFDDs and I agree it makes a lot of sense with thatch. It's very difficult to get useful data on the cause of electrical fires. Anecdotal evidence seems to suggest that it is rarely faulty wiring in...
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    Do we have to fit AFDD's in domestic installations?

    I live in a timber clad and old oak barn conversion. It has been fully rewired to a high standard. Because of multiple buildings, we have multiple CUs, all Hager. We recently decided to fit AFDDs to all areas where we have any kind of fire risk concern and had no difficulty getting them via...
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    Isolate circuit but trips fuse board

    Think of it this way Elisa 100. Live current flows out of your meter, via the consumer unit, through all of your circuits and flows back through the neutral wires. This flowing current will be used when you have an appliance or light switched on. All the neutral circuits are directly...
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    How to correctly wire 2-way switch for ring main

    I am a DIYer too. In my case I have invested in modern test equipment, appropriate tools, safe isolation testers and read both regs and testing manuals. Therefore, I do understand that DIY people need to do things for themselves at times, and I am not judgemental about that. My reaction when I...
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    £93.75 per hour + vat

    Reflecting on this, I think it is up to electricians to market themselves and the quality of their work if they wish to be appreciated and charge premium prices. This means explaining to consumers what quality work looks like (nice neat CU layouts) and why it is better to use good quality...
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    £93.75 per hour + vat

    This all depends surely on what people are paying for other services. £94 plus VAT would not pay for an hour of a trainee unqualified lawyer in the SE and it would be three times that for a partner in a small firm and £800 an hour for a partner in a large law or audit firm, plus VAT. (Obviously...
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    40 amp MCB live when off? Faulty?

    Thanks, yes, I have tested all breakers. That's how I found this one. I did the full range of tests, including ramp tests etc and recorded all values, before the electrician who will issue the certs comes and does his own. I installed a full RCBO board in my new kitchen (which is the main...
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    40 amp MCB live when off? Faulty?

    I weighed it versus a genuine Hager from TLC. Using my bakers scales which weigh digitally to the gram. They are identical. Shaking and it tapping it does not rectify the fault. I can't get it apart non-destructively, so I will be returning it for a refund and have already left a negative...
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    40 amp MCB live when off? Faulty?

    Fair point. I'll think it over how to proceed.
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    40 amp MCB live when off? Faulty?

    Yes, it could be fake I suppose. All of the others came from TLC in Tunbridge Wells - I buy nearly all of my electrical stuff from them. The Amazon one looks absolutely identical in every respect: same plastics, weight, printing etc and same packaging. Hardly seems worth counterfeit fakery for...
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    40 amp MCB live when off? Faulty?

    Thanks guys. It is a brand new and previously unused MCB so has never been abused in any way, or had too many trips etc. Anyway I've popped it out and replaced with a spare B132 as I don't have any blanking plates and I want to use the slot for a radial circuit to a utility room in due course...
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    40 amp MCB live when off? Faulty?

    Yes, it has 230v live at the outgoing, irrespective of whether the switch on the MCB is in the on or off position. Toggling the switch does not trip the RCB (nor would I expect it to in normal use). There is no circuit connected to this MCB and I have no need or present intention to connect one...
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    40 amp MCB live when off? Faulty?

    I have a number of circuits in a not very old Hager sub CU, with split RCDs. All of the active circuits (8 used in a 12 slot dual RCD CU) test fine. RCDs tripping fine under test with Megger MFT. However, I have a MTN B140 (40 amp obvs) MCB in the board that has nothing connected to it. ie...

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