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Discuss Two questions, two answers.........? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. polo1
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    polo1 Electrician's Arms

    Location:
    Glasgow
    Business Name:
    GW Electrical & Security
    Hi all,
    two questions, one to settle an "argument", the other for an apprentice's question that I haven't got the (confirmed) answer to at hand...

    Q1 - First, a three phase DB, with a three phase 32A supply to a three way switch fuse, which in turn serves a three phase socket outlet. Is the circuit from the DB to the switch fuse classed as a distribution circuit (I say it is)?

    Q2 - A BS7671 Amd 3 test question;
    " Portable hand-held lamps for use in a confined space should be:
    i - supplied from a SELV system
    ii - supplied from a PELV system
    iii - have a maximum voltage of 110v
    iv - have a maximum voltage of 230v"

    I'm fairly sure the answer is i) SELV, but I can find this in the Regs.
     
  2. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    1. is the circuit fused at DB?if so, then i'd consider it a final circuit from the DB fuse/s. it's similar to fitting a FCU on a single phase, feeding 1 or more sockets.

    think the answers are irrelevant to confined space. i'd go with (iii).
     
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  3. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
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    Agree with answer 1
    Answer 2 depends on what type of confined space, imo
     
    • Agree Agree x 2
  4. polo1
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    polo1 Electrician's Arms

    Location:
    Glasgow
    Business Name:
    GW Electrical & Security
    Q1 - my answer or Tel's????? BTW the supply from DB to the switch fuse is protected by a 32A mcb.

    Q2 - any idea where I can find the answer. As indicated, the question is from a 17th Ed Amd3 exam, so I'm guessing the answer must be in the regs somewhere, I just can't find it!

    Thanks fellas.
     
  5. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    706.410.3.10 (ii). SELV is specified if the confined space is of metallic (conductive) construction, but the question does not mention the construction.
     
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  6. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
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    Tels Answer.
    Section 706 maybe
     
  7. polo1
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    polo1 Electrician's Arms

    Location:
    Glasgow
    Business Name:
    GW Electrical & Security
    Q1 - So, not a distribution circuit
    Q2 - Indeed, S706!
    Many thanks chaps.
     
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  8. TonyMitchell
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    TonyMitchell Electrician's Arms

    Location:
    Berkshire, UK
    It comes down to whether a three way switched fuse alone is "switchgear"as defined in Part 2.
    The definition of "an assembly of main and auxiliary..." to me is more complex and as there is just one IEC60309 switched outlet, I'd say it is a Final circuit.
     
  9. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    TERMINOLOGY ALERT!!!!!. It's a 3 pole switch fuse, ( or maybe a 4 pole). not 3 way.:D:D:D.
     
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  10. anthonybragg
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    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    What fuses are in the switch fuse?
     
  11. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    round ones. :D:D:D.
     
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  12. Baker1988
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    Baker1988 Electrician's Arms

    Location:
    Kingston Upon Hull
    I would say it is a final circuit not distribution and also i would go for selv in confined spaces.
     
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  13. high voltage
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    high voltage New EF Member

    Location:
    Scotland
    1 Final circuit and 2 SELV 704.410.3.10 sub note 2
     
  14. dmxtothemax
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    dmxtothemax Regular EF Member

    Location:
    Australia
    Business Name:
    David Haddock Electronic Repairs
    YOUR BEING PADANTIC AGAIN !
    Jump to 40 seconds

     
    • Like Like x 3
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