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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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  • 0

    Sparkingchip: 
     

    When the power is restored in house 2 the zones are clearly breached, they probably are anyway.

    What 2 zones ?  - they will be on the same substation, so nominally the same equipotential zone, at least from a DNO perspective, and presumably if the street mains for water etc are metal, solidly bonded at the MET too.

    They may be on different phases, do not connect them !! 

    Yes, there are disproportionally slightly more accidents with gensets, but that is also because they mostly get used in an emergency, and the kit is often not maintained between uses, and it is seldom, so folk forget what to do and do things in the wrong order or forget parts of the process, such as arranging exhaust ventilation . (and a few tragically silly ones involving  fires refuelling petrol sets while the engine is running. )

    In terms of both fire and CO diesel is vastly safer.

    M

Reply
  • 0

    Sparkingchip: 
     

    When the power is restored in house 2 the zones are clearly breached, they probably are anyway.

    What 2 zones ?  - they will be on the same substation, so nominally the same equipotential zone, at least from a DNO perspective, and presumably if the street mains for water etc are metal, solidly bonded at the MET too.

    They may be on different phases, do not connect them !! 

    Yes, there are disproportionally slightly more accidents with gensets, but that is also because they mostly get used in an emergency, and the kit is often not maintained between uses, and it is seldom, so folk forget what to do and do things in the wrong order or forget parts of the process, such as arranging exhaust ventilation . (and a few tragically silly ones involving  fires refuelling petrol sets while the engine is running. )

    In terms of both fire and CO diesel is vastly safer.

    M

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