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  1. P

    External Consumer Unit

    As above, Ze is at the supply point of the whole installation, and Zs (or Zdb if you prefer) at other locations. There is nothing special about the 0.35 / 0.8 ohm values, they are typically met from domestic TN-C-S or TN-S supplies but not guaranteed. However, in the TN-C-S case they relate...
  2. P

    External Consumer Unit

    I also found you need a couple of small drain holes on the bottom to avoid damp building up. I was surprised as in my case the boxes also partially vented inside, but maybe the temperature difference outside was causing condensation. If you cannot be 100% sure water will not get in by any route...
  3. P

    External Consumer Unit

    The Blakley stuff will last!
  4. P

    Fitting bolt in fitting

    Hopefully Satan has this planned for their eternal task...
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    External Consumer Unit

    I would agree - always put your units in some sort of outer protection to keep the worst of the weather and UV light off it. Otherwise it will look a bit tatty in 2-3 years time and any imperfection in the sealing leads to big trouble. If you have some form of outer housing, such as GPR or even...
  6. P

    Eicr standards

    For the OP in case they have not come across them so far, the free BPG can be found here: https://www.----------------------------/professional-resources/best-practice-guides/
  7. P

    Eicr standards

    The Best Practice Guide #4 is a useful document to read in terms of how you might code in an EICR, but it is just that - guidance. There will always be unusual circumstances when a different code is merited than the simple guidance suggests and that is where a degree of experience and good...
  8. P

    How do you dress for an interview?

    You can have a Sunday best account for just this sort of thing.
  9. P

    La Rocca coffee machine help

    A friend of mine got a 2nd hand coffee machine (OK, probably 3rd or 4th...) for use in a charity cafe and it has problems. First problem is no manual or any other useful information! The power cable is 4 core brown, black, blue, green & yellow so it looks as if intended for two of a 3-phase...
  10. coffee-1.jpg

    coffee-1.jpg

    • pc1966
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    • Category: Electrical Videos
  11. coffee-2.jpg

    coffee-2.jpg

    • pc1966
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    • Category: Electrical Videos
  12. P

    ELCB or RCD for instant tankless shower water heaters?

    I would say an external RCD is better as it protects the cable as well, so insulation damage to the cable leading to a shock risk, or maybe fire risk, have a chance also of tripping the RCD. For UK regulations these days all circuits to a shower/bathroom need to be RCD protected for that sort...
  13. P

    UK Looking for advice

    Welcome to the forum! That is a pretty vague request, it would help if you could be a bit more specific about aspects you want help on!
  14. P

    Does a SPD need a dedicated MCB?

    If it is just the charger needing SPD, and that is coming off a 32A or more MCB, then adding SPD there for the charger will be fine, though depending on cable lengths it won't provide much in the way of protection for other stuff off that TPN board.
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    Does a SPD need a dedicated MCB?

    All SPD have an upper limit on the supply OCPD that is acceptable, but some of them have that at 125A fuses or higher so in practice they don't need a separate MCB in most situations. Here is one example that is OK for supplies to 250A...
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    Have you ever / would you ever; Work for an Electrical Supplier / Electrical Wholesaler

    I remember some amazing electrical / electronic shops in London around the Edgware Road area back in the early 80s, always though it would be fantastic to work among all of that stuff. However, most of the staff looked like they had worked there since the 1930s and last time I was in that area...
  17. P

    Isolation of TN supplies.

    Sound like something in the 100kVA range.
  18. P

    Isolation of TN supplies.

    I think larger & good quality UPS link the output N & E when on-battery, so they would need 4P switching as input N and output N cannot be assumed to be the same. However, I guess the batteries and inverter are always referenced to the output side N so only need the L switched to safely isolate...
  19. P

    Shall I ask my sparky to run a 6mm or 10mm cable ?

    Can to OP clarify if this extension is just another room on the side of the building (so multiple cables going through the walls for lights, sockets, etc, as for inside work) or a separate building with a run outside or buried?
  20. P

    Shall I ask my sparky to run a 6mm or 10mm cable ?

    I think energy cost consideration made it in to the amendment 2 regs, but would need to check. Generally speaking the cable cost, though not trivial, is small compared to the whole project and much less than the cost of future replacement if it proves too small for whatever reason. For that...

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