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  1. newfutile

    Solar New Solis inverter trips house electrics

    Some inverters leak a lot to earth and should not be on a 30ma (RCD) Residual Current Device especially a shared one for this reason.
  2. newfutile

    3phase DB as single phase

    It's coming out anyway so it's a rhetorical question. What do you you all think of this? Bits of wire used to bridge the bus bars and don't single phase consumer units need a linked switched line and neutral?
  3. Screenshot_20230510_102812_Gallery.jpg

    Screenshot_20230510_102812_Gallery.jpg

    • newfutile
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    • Category: Electrical Videos
  4. newfutile

    Increase current amperage by using darlington transistor

    A 2n3055 can switch more current , but as stated , if you can’t supply the current in the first place the voltage will drop to limit the current
  5. newfutile

    Corrigendum to BS_7671:2018+A2:2022

    Just to notify all those who have not been informed about the Corrigendum to BS_7671:2018+A2:2022 ,This will be published on may 15th 2023. it seems safety services in 443.4.1 is redefined with some examples removed ! 701.1 no longer references birthing pools. i expect we will find out more...
  6. newfutile

    UK RCD rating in Sub board less than suppy protection

    In short the (RCD) Residual Current Device must be protected by a suitable overcurrent device. BEAMA issued a technical bulletin about this: https://www.beama.org.uk/static/uploaded/6861a2e1-d8d4-4d81-b5fa710ba60ca4a7.pdf
  7. newfutile

    AFDDs needed in CU's over the 6th floor or all CU's?

    Its in all of the higher risk residential building 421.1.7 Arc fault detection devices conforming to EN62606 shall be provided for single phase AC final circuits supplying socket outlets with rated current not exceeding 32A in: • Higher risk residential buildings • Houses of multiple occupancy...
  8. newfutile

    Temporary supply TT earthing

    Some updates, I have secured the DNO earth and clipped the tails. I did wonder how common it is for a dno to supply an earth from an overhead pole supply
  9. Screenshot_20230427_095822_Gallery.jpg

    Screenshot_20230427_095822_Gallery.jpg

    • newfutile
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    • Category: Electrical Videos
  10. Screenshot_20230427_095816_Gallery.jpg

    Screenshot_20230427_095816_Gallery.jpg

    • newfutile
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    • Category: Electrical Videos
  11. newfutile

    Temporary supply TT earthing

    Yes they have a 22 ohms or so resistance between them, maybe fit a box over the DNO terminal?
  12. newfutile

    Maximum Zs on circuit protected by RCD - 1667?

    In any case it wont be for fault protection unless its TT earthing. over 200 ohms Ra is considered unstable . Your better off conducting R1+R2 and comparing these to the maximum ZS (roughly) , this will also ensure that it disconnects during a line-neutral short circuit.
  13. newfutile

    Temporary supply TT earthing

    It is a 2 module SPD and it does not have its own mcb (my mistake) .
  14. newfutile

    Temporary supply TT earthing

    Thanks for that , im just about to clip the tails to stop movement, i take it when our so called building works have finished I can use the supplied earth? will the spd work with only 16 amp earth fault current at 230 volts anyway. or maybe it will work better at clamping a surge ?
  15. newfutile

    Temporary supply TT earthing

    I have added a consumer unit and an earth stake to this so called temporary supply. This is a full rcbo board apart from the mcb to the spd. Would this need a upfront 300 ma or time delay rcd? As its a metal case I have a proper tails gland Ze=15.25 ohms with a earth fault current of almost 16...
  16. Screenshot_20230426_084642_Gallery.jpg

    Screenshot_20230426_084642_Gallery.jpg

    • newfutile
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    • Category: Electrical Videos
  17. newfutile

    Low Amperage From 4-100w Renogy Panels

    You will only get close to the full rated power when the sun is at 1000 watts per square meter , this assumes no shading, on the back of the panel you should see an open circuit voltage and a short circuit current.
  18. newfutile

    Extranous conductive parts or exposed

    I have connected the cpc and bonded all metalwork to each other only , I am waiting for the rcbo .
  19. newfutile

    Extranous conductive parts or exposed

    Would this count as inside the equipotential zone?
  20. Screenshot_20230420_135535_Gallery.jpg

    Screenshot_20230420_135535_Gallery.jpg

    • newfutile
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    • Category: Electrical Videos

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