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  1. Lucien Nunes

    Torque Talk

    In the days before ferrules were widely known outside the panel-building industry, it was quite a popular albeit misguided pastime. For example, we saw a number of small theatre lighting installations with a plug patch at the dimmers, where the flexible patch cords were tinned before connecting...
  2. Lucien Nunes

    32amp Single phase rackmount distro

    Is that with the original yellow latch ones or the TOP series with metal latches? I know Neutrik discontinued the original type because of similar problems of them not being robust against incorrect engagement and rotation. We don't give them a particularly hard life in most of our applications...
  3. Lucien Nunes

    I.R. testing existing circuits

    No, and it's unlikely. It would only really occur where the test is carried out from one live conductor to earth, the other one is shorted or very leaky to earth, and the load is very small and very sensitive. Nonetheless, if one uses a method that never puts 500V across the load, one can never...
  4. Lucien Nunes

    Hayward Power-Flo Matrix Pool Pump: Electrical problem to diagnose

    If it doesn't make it too hard to manoeuvre the board, that would certainly solve any high-resistance issues and it's the sort of thing I would do if I didn't expect anyone else to have to service the unit in the future.
  5. Lucien Nunes

    I.R. testing existing circuits

    Most functional leakage is due to capacitance e.g. from filter capacitors connected L-E, and from parts of a circuit that operate at much higher frequencies than 50Hz. Both of these will only occur when the equipment is connected to AC, not when subjected to a DC insulation test. As an example...
  6. Lucien Nunes

    Boiler circuit 16A MCB

    Generally copper conductors will be stranded to one of a number of classes within IEC 60228. Class 1 = solid conductor. Class 2 = stranded conductor (e.g. larger T+E, normal 6491x conduit cables) for which terminals in electrical fittings are normally suitable without ferrules or other...
  7. Lucien Nunes

    What is this black tarry stuff on the cable?

    If it's appearing from within the cable i.e. not something that could have oozed out of the building fabric, then I would agree that it is probably plasticiser escaping from the PVC, but of a type that does not attack the copper and therefore does not turn green. (The plasticiser that causes...
  8. Lucien Nunes

    32amp Single phase rackmount distro

    All things considered I agree that some of the commercial PDU offerings are either too shoddy, too expensive or both. When we designed racks, we used to design our own PDUs too. But that was in quantity, for large contracts. I wouldn't bother making a one-off for myself these days, like...
  9. Lucien Nunes

    Hayward Power-Flo Matrix Pool Pump: Electrical problem to diagnose

    The unit appears to be 12 years old and might have had significant runtime. Two likely causes of burnt crimp terminals exist: motor overload / winding failure or high resistance contact at the terminals themselves. Because the pump appeared to function normally and nothing tripped, and the...
  10. Lucien Nunes

    (UK) Adding additional circuits into old fuse box

    As above, if the distribution circuit is installed such that it does not need additional protection against shock, and the sub DB provides such protection to the final circuits that need it, then you can launch from a BS3036 fuse. When calculating the cable size, don't forget the additional...
  11. Lucien Nunes

    Torque Talk

    The manufacturers' instructions have to allow for the situation where a newly qualified installer wishes to fit their component to the highest standard. It might be the first real installation work in their career, with very little experience to guide them on how terminals behave. By providing...
  12. Lucien Nunes

    Connecting A Quick Windlass & Side-Power Remote Control

    I think the relays in the windlass are unlikely to need more than 4A. If you have a multimeter with a 10A DC current range, use it to measure the current taken through the up and down wires. Simply put the meter probes across the switch, i.e. between the red (common) and either direction. The...
  13. Lucien Nunes

    Insulation resistance problems

    If I understand you right, every circuit individually achieves over 200MΩ but when the neutrals are commoned, one circuit reads 1.4kΩ L-E? Do we know what the aggregate N-E reading was at that moment? You mention bollards; presumably this means permanently-connected lighting loads (on which we...
  14. Lucien Nunes

    Customer questioning his zappi EV charger.

    That is the colloquial way of describing it, yes, but unfortunately it's conceptually back-to-front. The supply provides a voltage (push) and the resistance of the load allows a certain amount of current through. Until the 1950s it was quite standard to refer to voltage or potential difference...
  15. Lucien Nunes

    Spur off ring breaker

    This is what I would call a pathological configuration that is specifically designed to be difficult to analyse in the terms set out in the regs. An unfused spur on an RFC bypasses the convention Ib<In<Iz due to the downstream protection afforded by the load being a single BS1363 point...
  16. Lucien Nunes

    Spur off ring breaker

    The crux is that to qualify as a safe and compliant unfused spur, as mentioned above it must only serve one point, which is what prevents the cable being overloaded. It doesn't matter whether it comes from the MCB or some other point in the ring. A 2.5mm² radial connected to a 32A MCB serving...
  17. Lucien Nunes

    Is 0.15M ohms N - E a fault on a cooker?

    How long is a piece of string? Yes, insulation resistance can go all over the shop with sheathed elements. I agree with the 0.3MΩ as an attainable limit but it's a bit of a last resort. Good elements that have been baked out should be able to do better than that. As @timhoward suggests, N-E (or...
  18. Lucien Nunes

    UK Hardwiring a smart doorbell

    I'd probably disconnect them from the old chime entirely and just join both blue and orange through with Wagos.
  19. Lucien Nunes

    UK Hardwiring a smart doorbell

    Looks like one cable with orange and blue cores paired is from a transformer and one from the push. By linking the blues you cam extend the transformer feed through to where the push was.
  20. Lucien Nunes

    UK 3 way switching help with

    Noting that using the 'conversion' method shown in that link, the PL and SL can be connected to L1 and L2 at any switch or paralleled with any run of the 3-core, including at an intermediate or in between two intermediates. Not applicable to the OP, whose PL and SL are in the same box, but...

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