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110v industrial sockets

bakey1959
I have come across some 110v industrial sockets (BSEN60309) which are installed in a utilities company's premises and which are not installed as Reduced Low Voltage (RLV) as detailed in BS7671.
I do understand that the RLV is required for constructions sites and similar premises due to the method of connection of the secondary which had a Line to Earth voltage of 55V.
The ones I have encountered have the Earth pin of the yellow 110v sockets connected to the primary earth, and when tested at the sockets there is 110v Line to Earth, and there is no connection of the Earth pin to a centre tapping of the double wound 240/110v transformer.
My thoughts are that, although the premises is not actually a BS7671 section 704 location, it does actually present similar hazards that might be encountered on a building site, and that having decided to install 110v sockets, presumably for safety reasons, why would you not ensure they were RLV where I believe there are no known incidents of electrocution?
I cannot find any guidance in the Safety First Best Practice Guide as to if a Classification code should be applied, but I am thinking that as an absolute minimum, the client should be informed in writing of the situation.
What do others think?
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    AJJewsbury said:
    I'm not sure it is, at least from a BS 7671 perspective.

    It is, for LV circuits on construction sites, where protection by RCD with rated residual operating current not exceeding 30 mA is omitted, supplying both socket-outlets, and hand-held equipment, having current rating up to 32 A ... see 704.410.3.10. Other options include electrical separation for individual items of equipment, or SELV/PELV.

    But since 30 mA (or less) RCD protection for the socket-outlets is ordinarily required by 411.3.3 (unless RLV is used), it seems that the RCD protection would be the deciding factor for the 110 V LV circuit?


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  • 0
    AJJewsbury said:
    I'm not sure it is, at least from a BS 7671 perspective.

    It is, for LV circuits on construction sites, where protection by RCD with rated residual operating current not exceeding 30 mA is omitted, supplying both socket-outlets, and hand-held equipment, having current rating up to 32 A ... see 704.410.3.10. Other options include electrical separation for individual items of equipment, or SELV/PELV.

    But since 30 mA (or less) RCD protection for the socket-outlets is ordinarily required by 411.3.3 (unless RLV is used), it seems that the RCD protection would be the deciding factor for the 110 V LV circuit?


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