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Connection to Neighbour

PG

A house has a 230V, 5kW standby generator which is connected to the electrical installation via a manual, double pole (L&N), break before make changeover switch. In accordance with DNO requirements, it has the neutral earthed by an electrode (in addition to the MET connection with earth).

The next-door neighbours do not have a standby generator and the question was raised that, in the event of a mains power loss, would it be OK to run an extension lead from the Standby Generator fed installation to supply, say, the neighbours fridge?

I sketched out the arrangement for both TN-S & TN-C-S and can’t see any problems. 

I note that where the neighbour’s equipment is connected to his/her dwelling equipotential bonding system (say a heating boiler supply) the two dwelling equipotential bonding systems would be interconnected by the extension lead earth core. This would be in addition to any parallel paths present (water, gas services etc.). 

Does anyone foresee any problems with the proposed arrangement of supplying the neighbour via an extension lead?

Many thanks.

PG

A picture is worth a thousand words ?

Generator next door.pdf

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    Using an extension lead core as a main bonding conductor might have its disadvantages - as I guess it's a lot smaller than the size usually required (perhaps 1.0mm2 instead of 10mm2) - and if depending on the details of the situation could end up carrying network diverted N currents - which could be significant especially if the DNO's network is suffering from disruption rather than being completely dead - probably the worst case being a broken CNE event.

    I guess another option would be to use the extension lead to supply the fridge alone and not to connect it to the bonding in the neighbouring property - so you'd end up with a situation rather like using class I equipment outdoors - far from ideal - but the sort of thing that goes on quite often without there being any huge piles of bodies in the street.

    The risks probably depend on the connections between the two properties - if they're closely connected to the DNO network or better still have bonded shared metallic services - they're likely to be in effect all part of the same extend ‘equipotential zone’ anyway so the actual risks might be minimal.

       - Andy.

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  • 0

    Using an extension lead core as a main bonding conductor might have its disadvantages - as I guess it's a lot smaller than the size usually required (perhaps 1.0mm2 instead of 10mm2) - and if depending on the details of the situation could end up carrying network diverted N currents - which could be significant especially if the DNO's network is suffering from disruption rather than being completely dead - probably the worst case being a broken CNE event.

    I guess another option would be to use the extension lead to supply the fridge alone and not to connect it to the bonding in the neighbouring property - so you'd end up with a situation rather like using class I equipment outdoors - far from ideal - but the sort of thing that goes on quite often without there being any huge piles of bodies in the street.

    The risks probably depend on the connections between the two properties - if they're closely connected to the DNO network or better still have bonded shared metallic services - they're likely to be in effect all part of the same extend ‘equipotential zone’ anyway so the actual risks might be minimal.

       - Andy.

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