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Distance between other electrical systems

Former Community Member
Former Community Member
Hi all,


I've been asked this time and time again and it could be a case that I've looked at this so much that it's made me go insane, but I'd like a 2nd opinion.


When installing a TT feeder pillar on the street, does the 2.5m rule come into effect when it's located near to a PME system or does this need to be 2.5m away from all other systems which are not connected to the same earthing system (not connected to the earth mat/rod under the feeder pillar?  


My personal opinion is that they should be 2.5m away from anything that isn't on the same electrical installation (even if it's another TT system nearby) as if there's a fault with one and the path to earth is broken then the path would flow directly between the person or whatever touches it and take the route of least resistance. I have my copies of the 18th edition and the CoP for EVCEI, but I've been looking at it for so long it's made things become less clear the more questions I'm being asked about the regs!


Any help would be much appreciated,


Regards,


S
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  • 0

    Sparkingchip:

    Here in Worcester there are two EV charging stations on the second floor of a multi storey car park that is above the shopping centre service area, what earthing system is currently required for such an installation?


    Andy 




    Regulation 722.411.4.1 tells you that PME is permitted where the vehicle may only be charged indoors. However, does the site have a private transformer? In which case it's likely to be TN-S and it's OK to use that.


    Both of the above scenarios are discussed in the IET Code of Practice for EV Charging Equipment Installation.


    There is another alternative - some fast charging electric vehicle supply equipment have in-built separation to add to the mix - this is also permissible, usually limited to the supply of one vehicle from one separated source (Reg 722.413.1.2). Similarly, an isolating transformer could be used for AC EVSE on the same basis.

     

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  • 0

    Sparkingchip:

    Here in Worcester there are two EV charging stations on the second floor of a multi storey car park that is above the shopping centre service area, what earthing system is currently required for such an installation?


    Andy 




    Regulation 722.411.4.1 tells you that PME is permitted where the vehicle may only be charged indoors. However, does the site have a private transformer? In which case it's likely to be TN-S and it's OK to use that.


    Both of the above scenarios are discussed in the IET Code of Practice for EV Charging Equipment Installation.


    There is another alternative - some fast charging electric vehicle supply equipment have in-built separation to add to the mix - this is also permissible, usually limited to the supply of one vehicle from one separated source (Reg 722.413.1.2). Similarly, an isolating transformer could be used for AC EVSE on the same basis.

     

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