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mmm thanks for the replies. the definitive is due to unbalanced TP loads and N isolating first ? and in single phase isolating all lives due to non pro users using system ? FYI this supplies a 4 post ramp in a domestic car enthusiasts garage. :?

thanks for the replies why in single phase is it normal to have a DP isolator yet it is acceptable to have only the Line isolated in 3ph !? therefore would an mcb on the phase or a single pole isolator(if you can get one) be acceptable as an isolator on a single phase sub main ;-)...

Hi all was looking at a 3 phase and neutral sub main 10mm swa to garage ramp - already installed. the supply was via a butchered wylex metal 8 way single phase consumer unit with a merlin 3 phase isolator supplied by 25mm tails and linked to a merlin 50a tp b mcb using 16mm tails . the...