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  1. S

    RCD types and DC current

    Some very good videos, thanks. Looks like I may be fitting more A type RCDs in future. It's just a shame all the dual RCD consumer units (except perhaps Hager) seem to come with AC type. I might also make a habit of watching the e5 channel and JW too.
  2. S

    RCD types and DC current

    These points kind of illustrate my thinking: are we really supposed to read the manuals of all the appliances in a house before specifying RCDs? Is anyone doing that? And with the best will in the world, we could go into a house with a twin-tub, fit AC RCDs, then next week the customer buys a...
  3. S

    RCD types and DC current

    So, this article...
  4. S

    Doorbells again - volt drop / max bell wire length

    Thanks DPG! I don't have it yet (don't even know whether the customer will want a bell or chime). But I just checked a few on TLC and they say then can be located up to 60m away from push when on transformer. So problem solved! 1571762382 Yes, and repeated the test a second time to make...
  5. S

    Doorbells again - volt drop / max bell wire length

    Hi Folks I've been trying to work out whether a doorbell will work with approximately 16m run of bell wire. I've tried to find out volt drop, resistance (to calculate volt drop), or even CSA of typical bell wire. But no luck. I tested an approx. 3m length with my MFT and got 0.87 Ohms. That...
  6. S

    Complicated dual tariff arrangement with four main switches.

    This thread: Scottish Hydro Total Heating Total control - MoneySavingExpert.com Forums - https://forums.moneysavingexpert.com/showthread.php?t=1131259 and in particular this post: "Meter 1 - a standard single rate meter meter (MPAN#1, first 3 digits on MPAN normally 171) This meter measures...
  7. S

    Complicated dual tariff arrangement with four main switches.

    Thanks for the suggestion. I will probably do this if I get the job. I think I have enough information now to know that each of the four sets of tails are indeed different and the four groups of circuits need to be kept separate - whether that's rates or times.
  8. S

    Complicated dual tariff arrangement with four main switches.

    Astonished! Just read the following on the SSE website: "The off-peak rate is available 24 hours a day for panel heaters, focal point fires, bathroom heaters, towel rails, the hot water boost and even electric showers." Wow!
  9. S

    Complicated dual tariff arrangement with four main switches.

    I just read on another forum the suggestion that it's a good idea to put the water heater on its own RCD as it's a higher tripping risk, so this avoids loosing the storage heaters if the water heater develops an earth fault. So I'm thinking of fitting a new multi-tariff CU, but replacing the...
  10. S

    Complicated dual tariff arrangement with four main switches.

    Or maybe that the water heating switches between high and low rates, while the storage heaters just switch off at high rate times.
  11. S

    Complicated dual tariff arrangement with four main switches.

    OK looks like they are called multi-tariff CUs, or in Scotland 'total control boards'. I've found some reading material on these, but if anyone knows anything about them I'd still be interested to hear from you. Looks like Hager at least still make and sell them.
  12. S

    Complicated dual tariff arrangement with four main switches.

    I'm kind of wondering whether at some time it might have been (or might still be) the case that the 24 hour heaters would operate on the low-rate at off-peak times, while socket, lights etc. would always be on the high rate. Just a guess really and still wouldn't explain the water heater.
  13. S

    Complicated dual tariff arrangement with four main switches.

    Hi Rpa07, I didn't think to take any I'm afraid, and I don't like to request a second visit before I've even provided a quote. I've seen similar arrangements in at least three other dwellings, so I don't think it's a one-off crazy design. Though I guess it's possible they might have all be...
  14. S

    Complicated dual tariff arrangement with four main switches.

    Hi Folks I'm used to (and understand reasonably well) simple dual tariff arrangements with two main switches (either two separate consumer units or a duplex). But I occasionally come across, and am now quoting for changing consumer units for a more complex arrangement that I don't full...
  15. S

    Electric boilers - how is this going to work.

    IMHO this is why we should have started the transition decades ago, replacing things like fossil-fueled power stations with renewable alternatives when they reached the end of their lifespan, rather than keeping on building them and then suddenly having to replace them all in one go at huge cost...
  16. S

    Electric boilers - how is this going to work.

    Even if the insulation and other efficiency measure meant you were using less than 1/3 of the energy?
  17. S

    Electric boilers - how is this going to work.

    Sounds fantastic! And very interesting regarding the technology in use. I'm guessing the solutions for new build and retrofit may well be quite different.
  18. S

    Electric boilers - how is this going to work.

    Jeremy who?
  19. S

    Electric boilers - how is this going to work.

    If they all had solar panels and storage batteries, that would surely help with the extra load...
  20. S

    Electric boilers - how is this going to work.

    Starts to make sense. I mean, you'd never get close to 30kW with instantaneous electric heaters even with them all actually running and drawing current at the same time, except maybe in a mansion. So it seems like a system boiler and cylinder might be the way to go where an electric boiler is...

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