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EV car parked within 2.5m of metal fence

Dean Williams

Hi All

I've attached a photo of a proposed EV charger position that will be fitted 2.5m from the LH metal fence (which is very long and surrounds the perimeter of the compound), however the parked car will most likely be parked within 2.5m in reality.

Details/concerns are:

3 phase PME supply

The metal fence reads 55 ohms to the MET

The EV charger will have PEN protection

Bonding the fence could pose a worse situation 

currents could circulate in ground

PME services underground.

Would designating the car position at 2.5m from the fence with ground painting and signage be acceptable? 

Is TT the only option even though underground services could be present.

Some people have said the PEN fault protection will be acceptable and not to bond.

If the IET gods could help it would be most appreciated.

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    Just an unqualified mortal opinion, but I'd tend towards not worrying about it. In general it's only extraneous-conductive-parts within buildings that require bonding these days (if you go down the route of trying to bond everything you end up having to bond the very soil beneath your feet to create a complete equipotential zone (not impossible - buried grids can achieve that, but usually very costly and inconvenient) and even then you'd often create more problems around the perimeter of such a zone than you solve within it). Even in the days where outdoor bonding wasn't discounted there was a regulation stipulating that a metal fence within reach of a (PME bonded) steel lamp post need not be bonded - so there's some sort of precedent there too. Never say never and the regs always leave room for engineering judgement to best suit individual circumstances if you think there's a particular risk.

       - Andy.

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  • 0

    Just an unqualified mortal opinion, but I'd tend towards not worrying about it. In general it's only extraneous-conductive-parts within buildings that require bonding these days (if you go down the route of trying to bond everything you end up having to bond the very soil beneath your feet to create a complete equipotential zone (not impossible - buried grids can achieve that, but usually very costly and inconvenient) and even then you'd often create more problems around the perimeter of such a zone than you solve within it). Even in the days where outdoor bonding wasn't discounted there was a regulation stipulating that a metal fence within reach of a (PME bonded) steel lamp post need not be bonded - so there's some sort of precedent there too. Never say never and the regs always leave room for engineering judgement to best suit individual circumstances if you think there's a particular risk.

       - Andy.

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