Speaking from a position of relative ignorance about such matters ... I assume that what westie was saying (which is also what I thought when I first saw the pics) is that they have probably just used two (linked) 3-phase cutouts (as a matter of 'convenience') as a means of splitting a single-phase supply into six set of tails (assumed for the meters oif 6 flats), each with their own service fuse. I don't know what the normal way of doing it is (presumably not what we're looking at!), but it sounds to me like a reasonable enough way of doing it, if the supply is single-phase.
That would obviously depend upon the size of the incoming cable, which westie has now told us would probably be about 147A. DNOs necessarily rely heavily on diversity (it would be ridiculous for them to create a network which could cope with every domestic consumer using 80A or 100A continuously and simultaneously!!), and I would guess (westie can confirm) that 147A is probably more than enough (with diversity) to provide 6 supplies - an average of about 24.5A continuously for each and every of the six supplies (which is probably not going to happen, domestically).
Depends on the size of the cable. Do you think there are ever more than 6 houses on one phase from a substation, i.e. do you think that we have 1 substation for every 18 houses?
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