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Earthing to EV Feeder pillar

adi_mrok

Hello, I have a question about earthing an EV Feeder pillar located outside.

We have an incoming supply to new feeder pillar from the building (which is in TN-C-S configuration) fed by BS-88 fuse 200 Amp TPN size. Off the feeder pillar we will be feeding new rapid charger rated at 160 Amp TPN - now the charger doesn't have inbuilt RCD nor O-PEN device therefore we need to put RCD on the feeder pillar (since it's 160Amp TPN I am putting an MCCB with Earth Leakage add on) plus an earth rod into the ground and do EV charger as TT. 

My question is does a new feeder pillar need to be on it's separate earth and in TT arrangement or can it be connected to earth coming from the building (TN-C-S)? Guidance from London Council in the link below and page 18-19 indicated I would need a separate rod for feeder pillar and I would need to disconnect it off the TN-C-S so just wanted to see with professionals if that's correct arrangement. Link below:

www.londoncouncils.gov.uk/.../Electrical Guidance_Final_v1.pdf

  • 0

    You need to segregate the new TT earthing system for the pillar and charger from the building earth system. This is to protect against the issues that may arise from a broken neutral on the (likely) DNO PME network. This is clear in the IET COP.

  • 0

    I would assume that the PME earth will cover the armour up to the newpillar, and then the supply enters an RCD. Then the pillar itself, the charger and the car, as I presume all are within reach of each other, should  be TT earthed to the same electrode.

    Terminate the supply cable armour inside the pillar in a way that it is not connected to the case, but could be reached for testing the armour and Zs of the cable if need be. (a line tap, or similar.)

    Mike.

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