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Exported PME to steel floodlight columns, public tennis courts

Patrick Hammond

Hi

We're doing an EICR at a local tennis club. It has a number of  3 phase floodlights mounted on galavanised columns illuminatimg outdoor tennis courts.

They are earthed via an exported PME TNCS system which was surprising because we'd imagined they would have sunk an earth rod at each column and not exported the PME.

The location is open to the public. Circuits not 30mA RCD protected foir additional protection.

I'm no

Many Thanks for your help

Parents
  • 0

    There is nothing in Section 714 that requires any consideration of loss of neutral. In fact 114.1 is explicit in that we need give no regard to such a circumstance if the supply has been given in accordance with ESQCR. 
    I accept that BS7671 is not a panacea for all risks but it is the key point of reference for most electrical installation designs. The confidence in Regulation 114.1 seems to have been treated as more of a tenet than a surety in the outworkings of 722 and, of course, it has been a long established principle in caravan parks and marinas that PME should not be used. 
    It would seem reasonable to consider that 714 would have had a similar clause had there been concern about loss of neutral as those that compile the regulations are clearly aware of the issue. Since there isn’t, I have the backing of BS7671 and, by inference, the HSE, in providing an earth facility to a steel lighting column on a tennis court. 

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  • 0

    There is nothing in Section 714 that requires any consideration of loss of neutral. In fact 114.1 is explicit in that we need give no regard to such a circumstance if the supply has been given in accordance with ESQCR. 
    I accept that BS7671 is not a panacea for all risks but it is the key point of reference for most electrical installation designs. The confidence in Regulation 114.1 seems to have been treated as more of a tenet than a surety in the outworkings of 722 and, of course, it has been a long established principle in caravan parks and marinas that PME should not be used. 
    It would seem reasonable to consider that 714 would have had a similar clause had there been concern about loss of neutral as those that compile the regulations are clearly aware of the issue. Since there isn’t, I have the backing of BS7671 and, by inference, the HSE, in providing an earth facility to a steel lighting column on a tennis court. 

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