2 electricity supplies to one building

It isn't beyond the DNOs to upgrade the network, but it will need planning and the doing, and in a very big way, and costs will have to rise -a lot- to cover it,  that is the point - the early adopters are for now freeloading, which makes adding charge points look much cheaper than it really is, and it will take time. We have been doing the cast iron gas main replacements you mention since the mid 1980s, and still are, so it is reasonable to allow a similar 30-40 year time frame for redoing the electrics.

Here is why.


Mean while the 100A fuse does not come into it, it is the fact  that all the network behind  it is sized assuming  about 10% of that load, something more like 10 A per house long term , and relies on loads averaging out to less than that over any reasonable period compared to the time it takes to get the transformers and cable heated to a dangerous temperature. (and looking a bit further back - we may have generation issues - we have  approx 24 million dwellings in the UK   and   perhaps  80-85GW of generation and import capability flat out of which 30% or so is available for domestic say 25GW to be be generous - that is only about like 1.05 kW each house average, and that ignores transmission losses )

Unlike storage heaters, where the load is most heavy in winter and time shifted to be at night when factories are not running, and then it is cold so cable and transformer ratings are higher, cars will presumably be needed in summer too, and maybe some will want to charge at work during the day ?

Electric cars are a good idea from a pollution perspective, and will come in due course, but they will be nothing like as cheap to roll out on mass as they appear at the moment, a dose of realism is needed.

M.

It isn't beyond the DNOs to upgrade the network, but it will need planning and the doing, and in a very big way, and costs will have to rise -a lot- to cover it,  that is the point - the early adopters are for now freeloading, which makes adding charge points look much cheaper than it really is, and it will take time. We have been doing the cast iron gas main replacements you mention since the mid 1980s, and still are, so it is reasonable to allow a similar 30-40 year time frame for redoing the electrics.

Here is why.


Mean while the 100A fuse does not come into it, it is the fact  that all the network behind  it is sized assuming  about 10% of that load, something more like 10 A per house long term , and relies on loads averaging out to less than that over any reasonable period compared to the time it takes to get the transformers and cable heated to a dangerous temperature. (and looking a bit further back - we may have generation issues - we have  approx 24 million dwellings in the UK   and   perhaps  80-85GW of generation and import capability flat out of which 30% or so is available for domestic say 25GW to be be generous - that is only about like 1.05 kW each house average, and that ignores transmission losses )

Unlike storage heaters, where the load is most heavy in winter and time shifted to be at night when factories are not running, and then it is cold so cable and transformer ratings are higher, cars will presumably be needed in summer too, and maybe some will want to charge at work during the day ?

Electric cars are a good idea from a pollution perspective, and will come in due course, but they will be nothing like as cheap to roll out on mass as they appear at the moment, a dose of realism is needed.

M.