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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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    In theory there are risks, including.

    The fridge or other class one appliance will be disconnected from the earth system in the second house, but instead connected to the earth rod at the first house. Under fault conditions, there could be a dangerous voltage between the fridge and some other appliance in the second house.

    In practice I would consider the risks to be small and arguably acceptable for short term use.

    I MIGHT consider it safer to use a 2 core extension lead with no CPC. This avoids all doubt about differing earth systems and voltages between them.

    Use an RCD socket outlet on the far end of the extension lead to give protection against insulation failure in the fridge.

Reply
  • 0

    In theory there are risks, including.

    The fridge or other class one appliance will be disconnected from the earth system in the second house, but instead connected to the earth rod at the first house. Under fault conditions, there could be a dangerous voltage between the fridge and some other appliance in the second house.

    In practice I would consider the risks to be small and arguably acceptable for short term use.

    I MIGHT consider it safer to use a 2 core extension lead with no CPC. This avoids all doubt about differing earth systems and voltages between them.

    Use an RCD socket outlet on the far end of the extension lead to give protection against insulation failure in the fridge.

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