551.4.3.2.1 Flats how to provide earth rod in island mode

Question

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?

mapj1 · Accepted Answer

But if it is ever configured to support an island mode of generation, and class 1 appliances can be used, then it will need some sort of electrode, but maybe not a rod - are there foundation steels for example. There may be a need for some trades other than electrical to dig up the car park or whatever. 
 'Impossible' may be solved other ways in other places. Going back over 20 years in Germany it was common to see a TNC incomer to a basement of an 'altbau' pre war block and then electrodes drilled out more or less horizontally through the sides of the walls Holes in masonry then re-proofed with some sort of tarry goop. (Only in the West. The East Germans did not really do earthing, or indeed neutral/earth differentiation. All rewired and much better now.) 
 Mike.

gkenyon · Answer

AdrianWint 
 Yes, this is a design consideration also - alongside the issue of load-shedding to prevent damage to the battery and unwanted tripping (well, unwanted overcurrent limit operation more correctly) of the inverter. 
 These topics for island mode operation are among those covered in the IET Code of Practice for Electrical Energy Storage Systems

551.4.3.2.1 Flats how to provide earth rod in island mode

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