All sorted now
2 x new isolator's, and was has been installed in our shop so the first thing to trip will be on our premises.
One thing i don't understand though. Is when we overpower the incoming supply (Which i am told is 74kvA (Our 5 beds use 72kvA apparently when all in full use)) it blows the 100A incoming fuses, rather than trip the breakers which are rated at 25A (3 ph). Why is that??
Cheers