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  1. Lucien Nunes

    Netherlands CU Fuses

    If you look in the right place on my interview on BBC News today, you can probably see exactly that pattern of stoppenkast (CU) on one of the glass shelf units. I've always been a fan of Diazed fuses, they were well ahead of their time when launched by Siemens over 100 years ago and still...
  2. Lucien Nunes

    Twin and Earth American style

    Amongst the countries that use a flat cable: USA: Bare earth, same CSA as line conductor AUS/NZ/IE/RU: Insulated earth, same CSA as line conductor UK: Bare earth, reduced CSA JP: Insulated earth, reduced CSA Japan is about the only example I can find with a smaller, insulated earth. Granted...
  3. Lucien Nunes

    Current measure with multimeter (help)

    I'm interested to know why you say this. A clamp meter is much more convenient and can be safer, but there's nothing inherently unsafe about using a meter for its intended purpose. I sometimes break into a circuit if it's likely to have a troublesome waveform that the clamp might not accurately...
  4. Lucien Nunes

    Do Distribution circuits require RCD protection?

    The aim is normally to design and install distribution circuits so that they don't need additional protection by RCD at the main board, thereby avoiding selectivity a.k.a. discrimination problems. So you would avoid e.g. twin and earth buried less than 50mm in the wall, as this would require RCD...
  5. Lucien Nunes

    Twin and Earth American style

    That's ordinary VIR conduit cable, I can't see the conductor to say what size it is. Rubber extruded over the conductor (sometimes in two layers) and the braided cotton serving over the top. There's thousands of miles of this stuff still in use, decreasing rapidly now but not all gone yet. The...
  6. Lucien Nunes

    Twin and Earth American style

    Unlikely to be silk, which was only used for very fine coil winding wires due to cost. Before PVC, the normal insulation for British conduit cables was VIR, vulcanised rubber covered with an impregnated cotton braid. The rubber provided the insulation, the cotton provided the strength and...
  7. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    I've just been advised that the interview has been rescheduled for transmission tomorrow (Wednesday)
  8. Lucien Nunes

    Twin and Earth American style

    Indeed, it was imperial for longer than it has been metric. Until 1966 not all flat cables had an earth core, they were called flat twin, flat triple, flat twin & earth etc. The same sizes were usually available in lead-sheathed or rubber-sheathed as desired, up to the introduction of PE and PVC...
  9. Lucien Nunes

    Twin and Earth American style

    This is normal nearly everywhere except UK. Our need to strictly separate lighting and sockets comes mainly from our use of 32A circuits which in turn comes from fused plugs. We used to be able to put lights and 5A sockets on the same circuit (and still do, for controlled lighting sockets) but...
  10. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    BBC Breakfast have just been in touch to apologise that because some live programme segments inc. Keir Starmer's overran, they had to postpone some pre-recorded ones inc. mine. Will let you know when it gets re-scheduled.
  11. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    Please can we keep stoner references out of the thread about my museum project. No issue with vintage TV programmes though
  12. Lucien Nunes

    DIY - Trailer AC Continuously Running

    'RC' and 'RH' are the inputs to the stat for cooling and heating, which in a home system might be fed by separate transformers. Here, they are presumably jumpered together as the same DC feed operates both functions. Then, the output you want for the A/C is 'Y', which becomes live from RC when...
  13. Lucien Nunes

    MEET on BBC TV (the Museum of Electrical and Electronic Engineering)

    Well this is great timing. I was going to 'watch with mother' but I'm back in hospital and not sure if I'll even get to see it live. We'll see how the day pans out. Got brought in early this morning with acute pain that we thought was related to the left kidney vs. lymph node contest that's...
  14. Lucien Nunes

    Could someone help with the age of this DB?

    I have some prices somewhere but yes. Hence most of these being found in commercial and industrial boards, with much less uptake into domestic where the additional cost over fuses wasn't thought justfied. These plastic-fronted domestic boards are relatively rare. Someone (Tel? Gerry?) on the...
  15. Lucien Nunes

    Could someone help with the age of this DB?

    Indeed. They have a little sealed hydraulic capsule inside the coil. When overcurrent is present, magnetic flux from the coil creates enough force on the ferrous piston inside to overcome a spring, causing it to move slowly against fluid resistance towards one end of the cylinder. As it moves...
  16. Lucien Nunes

    Could someone help with the age of this DB?

    Late 60s-70s. Crabtree C50 series, magnetic-hydraulic MCBs. Still in use in certain places e.g. London Underground. There are older designs of MCBs than those.
  17. Lucien Nunes

    Low voltage switch question

    Sorry, can't see the attachments. You can use one pole to switch the battery supply to the photocell input, and the other pole to select whether the LED is fed from the photocell output or direct from the battery.
  18. 16828769632935405185860012407688.jpg

    16828769632935405185860012407688.jpg

    • Lucien Nunes
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  19. Lucien Nunes

    Trace heating cable - testing issues

    It's a permanently-connected resistive load, so testing L-N with an insulation tester wouldn't yield any useful information anyway.
  20. Lucien Nunes

    Trace heating cable - testing issues

    I think what was meant by 'end-to-end' was across the heating cable circuit from line to neutral, not physically from one end of the pipe run to the other. Each length of cable must surely be terminated in a way that brings the line and neutral connections together into the same box where they...

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