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db/cu and 521.5.1 Ferromagnetic enclosures: electromagnetic effects

psychicwarrior

a good day wishes to all

 

‘they’ do not write these things for no reason; there is science present, so …

using this example: what's the non-compliance issue, if any in reality, with meter tails entering a db/cu through the same opening (fair enough), but a main earthing conductor being glanded/bolted to the housing inside (via a different aperture to the tails, to the earthbar attached to the case, along with bonding etc),  or even on the outside  ?   

 

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    Indeed, and it is important enough to be on the Condition Report Inspection Schedule (see 4.17). With respect to the first paragraph of the regulation, the intention seems clear but I would need to see the evidence in relation to the second paragraph. 
    The third paragraph is perhaps a statement of the obvious in that it would be difficult to achieve. So are we saying that if a satisfactory response is to be given for 4.17, we need to ensure the protective conductor comes through the same aperture in a steel DB? 
    The Irish regs are the same although no mention of the separate protective conductor with the swa.

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    Indeed, and it is important enough to be on the Condition Report Inspection Schedule (see 4.17). With respect to the first paragraph of the regulation, the intention seems clear but I would need to see the evidence in relation to the second paragraph. 
    The third paragraph is perhaps a statement of the obvious in that it would be difficult to achieve. So are we saying that if a satisfactory response is to be given for 4.17, we need to ensure the protective conductor comes through the same aperture in a steel DB? 
    The Irish regs are the same although no mention of the separate protective conductor with the swa.

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