Caravan Park

well  given that up to 70 houses can share one 400A fuse on a substation,  perhaps the diversity 0f 60 or 80 A over 24 caravans  all with non-synchronised occupants is not as bad as it seems, and like the 100A company fuse per house, you could probably handle a 16A RCBO.

You just need to emulate the same slow blow characteristics as the substation fuse ! (60A C type or  a real fuse then.)

To apply the same scaling factor as the ring and its 13A sockets you really need to convince yourself that the any loading more than the single cable loading cannot be all within one quarter of one end, but is more or less uniform  around the ring.

Snapping the ring into 2 radial circuits of half the power has little advantage, other than looking more like a standard circuit, and maybe allowing a slightly higher total. This does allow  a ring round test to ensure that nothing has dropped off, and gives a better voltage drop for the folk at the far point.


On a related note I have always been amazed at how many caravans and tents can be hooked up to a supply and not give any problems in practice - one of my many hobby roles has been to be part of the team behind the wiring for the Essex Scout Jamboree (coming up again this summer so expect some tales of woe after the hols) and in the camping compound for those of us on the infrastructure side, it is a bit  more 'self service' compared to the side where the youngsters are, and there seems to be almost no limit to the no of 16A splitters that can be cascaded to  3 phase 63A supply. Well at least three or four of these sort of things   daisy chained up, plus a few Y leads..  The other side of the box  is full of  16A RCBOS, one for each of the 6 sockets that are on each phase.

Nothing short of a rewire will prepare this site, or indeed probably any housing estate in the UK either, for the wholesale roll out of electric cars. It works now because early adopters are few and far between. When that is required it is probably easier to have a dedicated car park/ charging bay beside the incomers with suitable billing as well.

well  given that up to 70 houses can share one 400A fuse on a substation,  perhaps the diversity 0f 60 or 80 A over 24 caravans  all with non-synchronised occupants is not as bad as it seems, and like the 100A company fuse per house, you could probably handle a 16A RCBO.

You just need to emulate the same slow blow characteristics as the substation fuse ! (60A C type or  a real fuse then.)

To apply the same scaling factor as the ring and its 13A sockets you really need to convince yourself that the any loading more than the single cable loading cannot be all within one quarter of one end, but is more or less uniform  around the ring.

Snapping the ring into 2 radial circuits of half the power has little advantage, other than looking more like a standard circuit, and maybe allowing a slightly higher total. This does allow  a ring round test to ensure that nothing has dropped off, and gives a better voltage drop for the folk at the far point.


On a related note I have always been amazed at how many caravans and tents can be hooked up to a supply and not give any problems in practice - one of my many hobby roles has been to be part of the team behind the wiring for the Essex Scout Jamboree (coming up again this summer so expect some tales of woe after the hols) and in the camping compound for those of us on the infrastructure side, it is a bit  more 'self service' compared to the side where the youngsters are, and there seems to be almost no limit to the no of 16A splitters that can be cascaded to  3 phase 63A supply. Well at least three or four of these sort of things   daisy chained up, plus a few Y leads..  The other side of the box  is full of  16A RCBOS, one for each of the 6 sockets that are on each phase.

Nothing short of a rewire will prepare this site, or indeed probably any housing estate in the UK either, for the wholesale roll out of electric cars. It works now because early adopters are few and far between. When that is required it is probably easier to have a dedicated car park/ charging bay beside the incomers with suitable billing as well.