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  1. Lucien Nunes

    Extranous conductive parts or exposed

    Extraneous conductive parts are those liable to introduce a potential usually into a defined equipotential zone. E.g. if the equipotential is created within a building by bonding and earthing to the MET, then an incoming pipe could introduce a different potential if not bonded. But if the...
  2. Lucien Nunes

    Camper electrical question

    Am I correct in understanding that: a) The V/Ω and COM sockets of your multmeter are shorted together? It's extremely unlikely, I've never seen or heard of this happening, obviously it carries a risk of arc flash injury especially when used with conventional non-fused test leads. b) Placing the...
  3. Lucien Nunes

    Bathroom wiring for elec toothbrush

    It should be 100% possible if the conduit is installed correctly. Best practice is to complete the installation of the conduit system before starting to pull any cable in at all. If there are kinks and snags that prevent that approach, or a lack of drawing-in points, then the conduit is not...
  4. Lucien Nunes

    Bathroom wiring for elec toothbrush

    I appreciate this is off-topic for your question but I am intrigued as to why you would want to use the standards of a different country with incompatible parts. I appreciate that you want to achieve a high-quality, safe installation, but surely this means avoiding the bodges and dodges while...
  5. Lucien Nunes

    230v between N+E and 0v between L+E

    As above, but repeated to reinforce the message: If the polarity is reversed at the supply terminals or meter, no single-pole fuse or circuit breaker will offer any protection whatsoever against earth faults, and all circuits will be effectively fused at whatever the main fuse rating is. You...
  6. Lucien Nunes

    New patented electrical outlet

    In parts of European 3-phase land, they like to plug cookers in with 5-pin Perilex plugs, or the Swiss or French equivalents. Usually 16A or optionally 25A, if the cooker shares the load reasonably evenly between the phases, the 16A plug gives the equivalent of 48A single-phase, or 32A if only...
  7. Lucien Nunes

    Metal blanking plate to protect from wood burner stove?

    The way to protect something from radiant heat is to put something reflective on the front to minimise the amound of heat absorbed, then an insulator to prevent whatever is absorbed penetrating, then as little as possible behind so that heat that does get through the insulator can dissipate. But...
  8. Lucien Nunes

    Choosing the correct circuit breaker value

    There are various methods to estimate loading of general-purpose socket outlets, which are sometimes encoded in local regulations, so that is the first place to look. As with @pc1966 I am not familiar with Algerian practice although it is IEC-based (as opposed to NEC-based) and possibly...
  9. Lucien Nunes

    Dno incoming tails too small?

    It's a BS951 pipe clamp on a conduit, that obviously isn't the service cable itself but extends from either a multi-service cutout or looping point or something elsewhere. When I first looked at it on a phone screen it looked like the end of a pot poking out but it's a female bush. Sometimes MI...
  10. Lucien Nunes

    Using conduit as a CPC

    Testing continuity at 25A feels much more effective and serious, but how many have actually discovered a problem by testing at this current, that would not have been found at a lower current. E.g. the IEC leads mentioned by @westward10 revealed themselves to a resistance test, before they gave...
  11. Lucien Nunes

    Dno incoming tails too small?

    Yes looking at it again I see the female bush now. 7/.052 looks about right, just under 10 sqmm. Anybody spot the strands of earth that didn't make it into the clamp terminal?
  12. Lucien Nunes

    Dno incoming tails too small?

    What type of cable is that? Is it singles in conduit or is it MICC? With a clamp on pot for the earth? If it's MI, it might be large enough, partly because the solid conductor is larger than it looks, and partly because of its high current rating for a given size.
  13. Lucien Nunes

    Borehole pump serving 2 properties

    Post #10 bot alert, reviving 2 year old thread
  14. Lucien Nunes

    Extending neutrals with WAGO's in the socket

    If the conductors were long enough and only the insulation was damaged, I would probably have put heat-shrink sleeving over the damage and avoided making joints. Good quality thick-wall sleeving can provide equivalent insulation to the original, although not all heat-shrink sold in electrical...
  15. Lucien Nunes

    Kindly asking for Advice on DIY inverter setup

    It does sound like your batteries have lost capacity, which would be the first thing to check. The capacity analysers that use Peukert's exponent to extrapolate from a short, light discharge to predict the performance on a prolonged one, are reasonably accurate but not anywhere near as accurate...
  16. Lucien Nunes

    Car battery protection w/rare car use

    Most vehicle batteries should still be reasonably charged after one or two weeks, so it's worth checking that the battery is not faulty or life-expired, and that there is not an excessive drain from something that should not be operating. Not long ago, we found an excessive drain in one of our...
  17. Lucien Nunes

    Non contact pen picking up current on water pipe

    Strictly speaking, a non-contact detector such as a Voltstick also requires an earth reference, which the user supplies capacitively by holding the body of the stick. In theory, if one were in a well defined equipotential zone with lots of conductive structures connected to the MET downstream of...
  18. Lucien Nunes

    Using conduit as a CPC

    With entertainment lighting and power we have the advantage of circuits being in readily-identified and functionally related blocks, for which a single CPC is absolutely fine both electrically and administratively. In theory one CPC cable paralleled with the conduit is always adequate for...
  19. Lucien Nunes

    Non contact pen picking up current on water pipe

    Most water and heating pipes are either earthed, or have a relatively low resistance and high capacitance to earth. It's unusual, although not impossible, for them to float up to significant voltage w.r.t. earth. We need to be careful not to confuse the OP, who is not experienced with making...
  20. Lucien Nunes

    Non contact pen picking up current on water pipe

    We might have to expand on the definition of 'spurious' for the OP's benefit. The voltage sensed e.g. on a disconnected a.k.a. floating conductor that has significant capacitive coupling to a live one, is a real voltage. It's not unknown to read 50-100V on a long 'dead' circuit lying amongst...

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