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  1. P

    Singles in ducts

    True, cooling is generally better with parallel split. I just halved the OP's value as should be more or less the same VD, etc, and at least as good CCC.
  2. P

    Singles in ducts

    To some degree it would depend very much on the nature of the ducting and routes they take. My concern with this is you could get a significant magnetic field between the two runs due to the lack of current balance (cancellation) on each pair of conductors and so if they are separated by far, or...
  3. P

    Singles in ducts

    Yes, a good point! Still, as long as the length of cable in either route is sensibly similar than it ought to be fine. Not sure what that actually translates in to but I would guess 5-10% max difference might be reasonable (so long as a similar level of current imbalance is not pushing one set...
  4. P

    Singles in ducts

    Obviously you have added requirements for protection of parallel circuits, but if that can also be met then probably a whole lot easier to install as well.
  5. P

    Singles in ducts

    This would appear to go against regulation 521.8.1 However, if you could fit 4*120mm in one duct, and 4*120mm in another so you have a parallel arrangement but each duct has all live conductors of that parallel set, it would appear to be OK.
  6. P

    Drilling holes in Fusebox knockouts?

    You can get expensive hydraulic and electric tools to apply the punching force, great if you do a lot of holes but very costly otherwise. Most folks who only need to use a hole punch on an occasion just use the pulling bolts, some are Allen headed, others regular hex-head bolts. But make sure...
  7. P

    Drilling holes in Fusebox knockouts?

    The 32-20mm reducer (RE3220G) looks like a really handy thing to keep in the 'misc' box of bits just in case, I guess along with a couple of others (such as RE2520G and RE3225G) for situations when you need to fit SWA glands or similar to the wrong size of punch-out. Or someone just drilled the...
  8. P

    Drilling holes in Fusebox knockouts?

    For the curious among you, here is an example hole punch for a BNC connector with the anti-rotation flat: https://www.heamar.co.uk/greenlee-50600770-12-7mm-x-11-9mm-d-shaped-punch.html And here is an example for a computer D connector: https://uk.rs-online.com/web/p/punch-die-kits/4778713 Be...
  9. P

    Drilling holes in Fusebox knockouts?

    Agree with the Q-max hole punches, though there are better places to buy them than Amazon, for example: https://www.tooled-up.com/q-max-sheet-metal-hole-punch-metric/prod/7642/ https://stakesys.co.uk/hole-punches-hole-saws/q-max-cutters/q-max-cutter-round-metric...
  10. P

    Drilling holes in Fusebox knockouts?

    I would be weary of fixing anything heavy/stiff to a knockout in case it breaks off later. For SWA you ought to have a CPC tail to a banjo or earthing nut anyway, but it still leaves the mechanical vulnerability. A metal plate inside is an obvious solution, you could even have it fixed partly...
  11. P

    Lucien Nunes - Auction of collection

    All rather sad. I had a look at the listings and while there are a few things I would like to bid for, realistically I don't need any more "junk", if anything I should be trying to clear stuff out.
  12. P

    Lucien Nunes - Auction of collection

    These are the sort of parties I want to be invited to. Alas, that has not been happening :(
  13. P

    Skeleton board? How do I get around this?

    I'm not sure you will find a new BS3036 fuse for sale anywhere. But the plug-in replacement MCBs are easy to get and whenever I encounter a rewirable board I would replace the lot with the breakers for: The "wrong size wire" buzz mentioned leading to poor/no circuit protection Avoiding the...
  14. P

    SBS Trade consumer units

    I strongly suspect that 'Live' really just re-brand some supplier who makes a lot more for the EU market, maybe they are listed as they got UK certification/testing done for SBS, or just for internal purposes to sell to SBS? But it is odd if they are the actual importer due to size they don't...
  15. P

    SBS Trade consumer units

    A lot of the EU mandated DP MCBs and RCBOs so I suspect that is the primary market for dual busbars. But they should have become the norm decades ago so RCBO were all neat and compact, not the spaghetti junction in many CU. Even if MCB were still SP in the UK they could have had just a...
  16. P

    UK some help with grouping of cables

    As above, for each segment of a complicated arrangement you use the lowest cable temperature rating of that group in any CCC computation. Zs it trickier because you might have X meters at 70C due to a grouping with a lower rating, and in another area Y meters at 90C as your new cable can meet...
  17. P

    Do we have to fit AFDD's in domestic installations?

    As @davesparks pointed out the guidance (BPG #4 page 20) codes this as C3 so not essential to change. If they need a new CU for other reasons then you should be fitting AFDD due to the current regs requiring them, but not as an EICR-forced change.
  18. P

    MCCB panel selection

    Useful to know. In my case there will be 150x150mm trunking at top/bottom and almost certainly I will be using tri-rated cable, probably 70mm, for the connections though I was also considering parallel 50mm just to make routing & bending radius, etc, easier everywhere when pondering 95mm.
  19. P

    Toilet facilities on the job

    You may laugh, yes you probably will, but a friend of mine found the chemical toilet in her father's camper van had not been emptied for 6 years!
  20. P

    MCCB panel selection

    I'm guessing the PP41603X is the matching MCCB for 160A. Do you know if there is a direct connection option for feeding it? In my case its coming off a fused-switch not far away so no need for a incoming switch/breaker on the panel.

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