Recent content by Selfmade

  1. S

    AFDDs for single-socket circuits

    So it's anyone's guess. In domestic where I work, people will weigh up all sorts of factors besides the economic - peace of mind vs. potential distress, sentimental value of the equipment that might be damaged, their own personal level of risk aversion etc. etc. And why shouldn't they?
  2. S

    AFDDs for single-socket circuits

    Some good points, but it's not just ability to pay, it's also individual choice and priorities. Concepts that are lost on too many in this age we live in.
  3. S

    AFDDs for single-socket circuits

    Fascinating conversation folks! One quick note about some of the graphs others have shown above - I think when they refer to appliances they are not just referring to electrical appliances. So gas heaters for e.g. would be included.
  4. S

    Switch mode power supplies and protection class.

    Thanks very much for this detailed and fascinating explanation. Really good to get the historical context too, thanks.
  5. S

    AFDDs for single-socket circuits

    True, although at least in the event of an MCB trip we can break up and test sections of the circuit to find the location of the fault.
  6. S

    Switch mode power supplies and protection class.

    Interesting, thanks. It was one of JW's videos about SPDs where he stated that a key reason for needing SPDs is that modern electronics don't have transformers and so the entire devices is exposed to any surges. He described how an SMPS works and it didn't seem to me to offer separation. But...
  7. S

    AFDDs for single-socket circuits

    Lots of interesting info, thanks. The issue of how to track down a fault is one thing that concerns me, too. I think I'd probably proceed something like this: 1. Ask the customer to switch everything off and see if it will reset. If so ask them to try to note over time if it trips when a...
  8. S

    AFDDs for single-socket circuits

    Thanks for reply - I should have been clearer, this doesn't relate to a specific job but is just me thinking around the issues. Most of the premises I work on are not 'high risk' or otherwise required to have AFDDs. I'm aware of the fact SPDs are required unless the customer opts out, while...
  9. S

    AFDDs for single-socket circuits

    Arc Fault Finding Damage Detection Devices?
  10. S

    AFDDs for single-socket circuits

    Yes, but quite a few white goods. Including some high profile cases.
  11. S

    AFDDs for single-socket circuits

    You're welcome! And thanks also! You may be right that they will not save many lives. And I'm not a proponent of the 'one life anywhere' argument - it may sound callous but what do we all eat if we put all our resources into saving one life? Everything is a risk/benefit analysis. It's a...
  12. S

    AFDDs for single-socket circuits

    Ahhhh yes but the customer might want them and might be happy to pay for them. Who am I to make a value judgement on their cost/benefit analysis? Personally if I was doing a CU in my own home I'd probably fit an AFDD for the kitchen sockets but not bother elsewhere.
  13. S

    AFDDs for single-socket circuits

    Thanks for reply timhoward. So here's my thinking: I'm ideologically in favour of giving the customer as much choice as possible. For a while I have, where appropriate, quoted for a 'bare bones' job as cheaply as possible (to secure the job), and offered optional extras / pricier options that...
  14. S

    Switch mode power supplies and protection class.

    My understanding is that a SMPS does not separate, like a SELV transformer, the secondary from the primary. Therefore presumably the equipment supplied cannot be IEC protection class III. So what class is the equipment? For example a laptop with an SMPS, metal body and high resistance...
  15. S

    AFDDs for single-socket circuits

    Haven't been on here for a while, so sorry if this has been discussed before. BS7671 2018 + A2 Regulation 421.1.7 recommends AFDDs for "single-phase AC circuits supplying socket outlets..." (requires in certain premises). My intention is that from September 27th I will recommend them to...

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