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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
    Even if the DNO's did install the charge points, I'm sure that TT-ing large swathes of them would still present problems in many situations - including:
    •  Maintaining separation below ground between earth electrodes and buried conductive parts connected to the PME earth.

    •  "returning" the touch voltage between someone's feet and the vehicle body, if they are standing over buried conductive parts connected to the PME earth, if the TT earth to the vehicle body is "separated" as previous.

    •  Dangers of excavating for, or driving, earth electrodes, when it's not clear where buried services are in many streets.

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  • 0
    Even if the DNO's did install the charge points, I'm sure that TT-ing large swathes of them would still present problems in many situations - including:
    •  Maintaining separation below ground between earth electrodes and buried conductive parts connected to the PME earth.

    •  "returning" the touch voltage between someone's feet and the vehicle body, if they are standing over buried conductive parts connected to the PME earth, if the TT earth to the vehicle body is "separated" as previous.

    •  Dangers of excavating for, or driving, earth electrodes, when it's not clear where buried services are in many streets.

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