Recent content by alasdairp

  1. alasdairp

    Smart Meter Tripping RCD

    The International Angency for Research on Cancer (IARC), part of W.H.O, categorised all RF / microwave energy close to the body as a Group 2B "possible human carcinogen" in 2011 and that is likely to be upgraded to a 2A "probable human carcinogen" in the next couple of years as the scientific...
  2. alasdairp

    Ground rod and EMI issue

    Looking at the photos I am not surprised you have problems. The control electronics should be in their own solid metal screened enclosures and well away from the power leads. Earthing should be back to a single star ground point. Signal and control commons (0 volts) should be separate wires...
  3. alasdairp

    Customer thinks smart meter is wrong

    There have been many reports of high-reading smart meters in many countries. They take samples and calculate the power between the samples - they don't (usually) have true RMS converter chips (too expensive in their cut-price wars) - so a very spikey consumption (like caused by a washing machine...
  4. alasdairp

    Difference in amperage though household meter question

    Ah, I now follow. IF (quite a big if in my opinion) the inductance of the meter coil is enough to improve a bad capacitive PF and move it closer to unity, then the current on the supply side will be lower for the same total power. Yes, that is true. It would be very interesting to measure and...
  5. alasdairp

    Difference in amperage though household meter question

    Thanks, Lucien. A thoughtful and interesting contribution. I strongly agree that local magnetic fields (espercially from the meter if an old rotating disc type) would be likely to affect the clamp-meter reading - though the OP says he has measured multiple times and the values are very...
  6. alasdairp

    Difference in amperage though household meter question

    You are correct if there are no wiring problems. For filter caps (etc) it should be a max of less than 1 mA/device (cookers and IT equipment can be a few mA). So nowhere near the 120 mA apparently missing. However, even a TT supply Neutral is connected to Earth at the distribution transformer...
  7. alasdairp

    Need some basic electrical wiring help

    Ugh! I would throw the 12v adapter out and put 3 new 230v LED luminaires in instead of the halogens. Simples. If the motor does not turn when mains volts are applied then it is probably dead and you will need to source a replacement (try Ebay). As this plugs in and if you have it in a place...
  8. alasdairp

    Nuisance RCD advice

    I wonder why that first RCD is not just an isolating switch - presumably because it is a TT supply with a local Earth spike. If all the CUs have RCDs in them then another series RCD is inappropriate - especially if it is also a 30 mA one. Ideally RCDs should not be in series with each other. If...
  9. alasdairp

    Difference in amperage though household meter question

    I suspect that the missing 0.12 amps is going down the Earth bonding conductor. This is very common in PME areas. Measure that. Also check the Neutral-Earth voltage (ideally it should be zero - but I bet it is not). It does not sound like a worrisome problem. I once found over 300 amps...
  10. alasdairp

    My solar array doesn't seem to generate enough energy

    I had one thought - could it have been limited by a high SSE network supply voltage in the area and a relatively low demand for extra power? The inverter cannot keep just pushing up the local supply voltage in order to drive out its "rated full power". Some SSE areas (and elsewhere in the UK!)...
  11. alasdairp

    Intermittent Ring fault! Any advice please.

    One of the devices (x4 computers and x4 monitors. X2 photocopier machines and x1 shredder) may be intermittantly faulty and causing the RCD to trip about once a month(?). How often does the shredder get used? As the ring measures OK then it may well be something that is plugged in that is...
  12. alasdairp

    Hello can you help me fix my house?

    Probably - but he might come back for another look.
  13. alasdairp

    Question about 'self made' 12V Lighting in new extension

    There is a 60 page IET Code of Practice for Low and ELV DC power distribution in Buildings. I have version 1, published in 2015. ELV is defined as not exceeding 50 volts AC or 120 volts ripple-free DC (in BS7671). You do need to meet BS7671 as regards to current carrying capacity of the wires...
  14. alasdairp

    Hello can you help me fix my house?

    I cannot see where your main protective Earth comes from. It is not from the supply cable, so I assume it is a TT installation that requires a separate Earth/Ground rod - but no sign of the incoming Earth bond wire. As someone said earlier - if the elcb/RCD is OK, then a 100 mA leakage fault is...
  15. alasdairp

    Estate Agents says Fit For Purpose

    I prefer to cook using a gas hob and an ordinary electric oven. Induction hobs are very energy efficient but the high-frequency EMFs around the hob that the cook is exposed to when it is in use can even exceed the very high ICNIRP maximum LF EMF exposure levels. Such exposure IS associated with...

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