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551.4.3.2.1 Flats how to provide earth rod in island mode

DA

So reading the latest regs I take it we are to provide an earth rod in a prosumer setup for island mode supplies.

Any ideas how this works practically in a top floor flat?

Parents
  • 0

    I need an earth to provide ADS.

    Not necessarily - in a TN system the actual ADS part will work perfectly well with just the c.p.c.s connected to the supply star point (N) - the connection with Earth merely gives the system a 0V reference (which has a number of other safety and practical benefits) . In some situations - e.g. self contained generators aboard mobile units - the regs specifically say that a connection to something like the vehicle chassis may be used instead of an actual Earth electrode, despite it being pretty well insulated from the ground by rubber tyres.

        - Andy.

Reply
  • 0

    I need an earth to provide ADS.

    Not necessarily - in a TN system the actual ADS part will work perfectly well with just the c.p.c.s connected to the supply star point (N) - the connection with Earth merely gives the system a 0V reference (which has a number of other safety and practical benefits) . In some situations - e.g. self contained generators aboard mobile units - the regs specifically say that a connection to something like the vehicle chassis may be used instead of an actual Earth electrode, despite it being pretty well insulated from the ground by rubber tyres.

        - Andy.

Children
  • 0 in reply to AJJewsbury

    True, but only while it is a self contained box, and a shock or fault to something truly earthed is impossible. As soon as that mobile unit parks, and an extension lead is thrown out the back for a floodlight or something, then it gets sticky, what happens if that extension lead lands in a puddle or snags on barbed wire so that the brown core is now earthed to terra-firma ?

    You can be the first to grab hold of the vehicle door handle in that case if you like...

    So when we park up, you are supposed to drive a spike or park with a contact plate under one of the tyres squished into something moist like  grass verge.

    Mike

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