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Outdoor entertainment licence condition

lyledunn

This is one of several conditions a local council has placed on an outdoor entertainment licence I am dealing with. The other conditions are not related to electrical safety. It seems odd that this single item would be specifically highlighted. Odd though it may be, apart from the rather large RCD requirement (smiley here), I also think it could be misconstrued. Is this just another example of misunderstanding the separate concepts of earthing and bonding?

Quite why the condition did not simply refer to the need for compliance with BS7909 or perhaps section 740 of 7671 instead of a singling out one issue, I do not know.  

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    lyledunn said:
    Quite why the condition did not simply refer to the need for compliance with BS7909 or perhaps section 740 of 7671

    I think there are at least two reasons:

    1. BS 7671, since the introduction of the 17th Ed in 2008, doesn't really address extraneous-conductive-parts outside buildings, only requiring protective equipotential bonding in each building (see Regulation 411.3.1.2). This is not universally accepted, and the water industry specifications (WIMES) has a different view, for some very good reasons; having said that, BS 7671 is a "minimum standard" and not a "specification" ...


    2. Regulation 411.3.1.1 might apply if the stated 'conductive parts' are connected, fortuitously or otherwise, to exposed-conductive-parts connected to different earthing systems ... BUT you can't just bond these, or connect them through the conducive parts as stated. Ignoring PME issues and diverted neutral currents, see Regulation 542.1.3.3.
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    lyledunn said:
    Quite why the condition did not simply refer to the need for compliance with BS7909 or perhaps section 740 of 7671

    I think there are at least two reasons:

    1. BS 7671, since the introduction of the 17th Ed in 2008, doesn't really address extraneous-conductive-parts outside buildings, only requiring protective equipotential bonding in each building (see Regulation 411.3.1.2). This is not universally accepted, and the water industry specifications (WIMES) has a different view, for some very good reasons; having said that, BS 7671 is a "minimum standard" and not a "specification" ...


    2. Regulation 411.3.1.1 might apply if the stated 'conductive parts' are connected, fortuitously or otherwise, to exposed-conductive-parts connected to different earthing systems ... BUT you can't just bond these, or connect them through the conducive parts as stated. Ignoring PME issues and diverted neutral currents, see Regulation 542.1.3.3.
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