2 electricity supplies to one building

Hmm. So in a way the load management is in the installer's play book. however, I presume he has no easy way of knowing if the same thing has been done on a number of houses on the same substation already . Arguably that is SEP (Someone Else's Problem) until the day it is not.

Just for background.

Be aware that a 100A fuse holder often has a 60A or 80A fuse in it - there is one size of standard fuse holder, but like the fuse in the 13A plug  there is often a smaller one fitted, especially in areas where supply is a bit 'tight' .

It may amuse you to realise that on a housing estate there may be 50-70 houses on each of the 3 phases of your local substation, and although each house has a  fuse as above , the fuse covering the whole phase at the transformer end will be 400, 600 or maybe 800A depending on the transformer size, but seldom more. It all works because folk take short showers and cook dinner at different times,  oh and the fact that the fuses and the transformer are chunky things and  take ages to heat up, so can ride through 100% overload for the odd half hour if required so long as there is some cooling down time afterwards.

Quite a few folk are slightly concerned that if electric cars really take off then there will need to be a lot of transformer upgrades. (and there are literally hundreds of thousands of substations in the UK, some lightly loaded ,sure, others however are quite near the knuckle already. The odd pole-pig round here has the paint blistered off and now going rusty, so preventive maintenance is clearly a bit remiss.)

Mike.

Hmm. So in a way the load management is in the installer's play book. however, I presume he has no easy way of knowing if the same thing has been done on a number of houses on the same substation already . Arguably that is SEP (Someone Else's Problem) until the day it is not.

Just for background.

Be aware that a 100A fuse holder often has a 60A or 80A fuse in it - there is one size of standard fuse holder, but like the fuse in the 13A plug  there is often a smaller one fitted, especially in areas where supply is a bit 'tight' .

It may amuse you to realise that on a housing estate there may be 50-70 houses on each of the 3 phases of your local substation, and although each house has a  fuse as above , the fuse covering the whole phase at the transformer end will be 400, 600 or maybe 800A depending on the transformer size, but seldom more. It all works because folk take short showers and cook dinner at different times,  oh and the fact that the fuses and the transformer are chunky things and  take ages to heat up, so can ride through 100% overload for the odd half hour if required so long as there is some cooling down time afterwards.

Quite a few folk are slightly concerned that if electric cars really take off then there will need to be a lot of transformer upgrades. (and there are literally hundreds of thousands of substations in the UK, some lightly loaded ,sure, others however are quite near the knuckle already. The odd pole-pig round here has the paint blistered off and now going rusty, so preventive maintenance is clearly a bit remiss.)

Mike.