Lost in translation????

Discussion in 'Electrics UK' started by wv62, 5 May 2015.

  1. wv62

    wv62

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    This is a warning sign on the outside of an inverter cubicle on a solar farm I worked at. It seems every cubicle by this company (a very well known multi national, not sure if I should name them as they employ me!) in the UK has the same sign. Do you think something was lost in translation??[​IMG]
     
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  3. JohnW2

    JohnW2

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    :)

    Also, is it actually HV, in the IEC sense?

    Kind Regards, John
     
  4. wv62

    wv62

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    The DC in is around 1000V and the outgoing varies depending on the DNO.
     
  5. JohnW2

    JohnW2

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    1000V DC is obviously 'LV'. Is it likley that the output voltage would be greater than LV?

    Kind Regards, John
     
  6. westie101

    westie101

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    Nice
    Particularly when the wording should possibly be

    "Danger of Death - Keep Off (or out)"

    Solar farms will usually output to the DNO at 6.6 or 11kv. though we have just had one connected at 33kV
    The control figure is the maximum load and the capacity of the local networks.
    We have generation sites connected at 132kV in places
     
  7. JohnW2

    JohnW2

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    Indeed - but maybe what they intended (but didn't get quite right!) was "Danger to Life" ?

    Kind Regards, John
     
  8. westie101

    westie101

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    Oh I got that straight away
     
  9. ericmark

    ericmark

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    Maybe written by Mary Shelley author of Frankenstein!
     
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  11. plugwash

    plugwash

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    That depends on the earthing arrangements. A +-500V (relative to earth) system would be LV but a system with one end grounded and the other at 1000V relative to earth would be HV (by the BS7671 definition). I'm not sure about floating systems as "nominal voltage relative to earth" would be undefined in that case. I'm not sure if that means you should ignore the earth relative part of the definition or if you should assume the worst.
     
  12. wv62

    wv62

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    Hmmm.....Just got an image of being chased around the field by an inverter :eek:
     
  13. JohnW2

    JohnW2

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    Eh? The BS7671/IEC definition of LV goes up to 1500V DC, doesn't it?
    Indeed. The BS7671 definitions really 'fail' when the supply is floating relative to earth!

    Kind Regards, John
     
  14. plugwash

    plugwash

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    AIUI it's 1500V between conductors but only 900V relative to earth.
     
  15. JohnW2

    JohnW2

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    Ah, yes - I forgot about the 900V :oops:

    Kind Regards, John
     
  16. ban-all-sheds

    ban-all-sheds

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    Here's a suggested warning notice:

    [​IMG]

    It avoids all the problems with ELV/LV/HV terminology and has the added bonus of meaning electricians only need to carry one type.
     
  17. westie101

    westie101

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