I've got a 3-phase (4-wire) supplied to my house, and are looking to get the 3-phase supply to the garage. The supply is fed via 3 x 60 A fuses. I assume a 3-phase isolator with internal fuses is a typical way to do this.
I was looking at the Axiom range, in particular the SF63
https://www.cedelectrical.co.uk/pdf/axiom_industrial.pdf
These seem significantly cheaper than similar units from Hager and elsewhere, and I was wondering what the quality is like. Since it is going to be located in the house, supplying power to the garage, it is not going to get much use, like in an industrial location. It will probably only get switched once per year or so on average.
Is it acceptable to have the switch in one box, and isolator in the other, rather than both in the one box? Having these separate might be preferable, as I assume the depth will be less. I have only 167 mm between the mounting surface and a sliding cupboard. It's not clear from the above data sheet if the 141 mm includes the handle or not. If so, that would fit, but if not, the handle will probably prevent the cupboard being closed. In which case, I assume a switch in one box and fuses in another would probably allow for a smaller overall depth, but maybe I am mistaken on that. (On that particular range, the boxes are the same sizes, irrespective of whether there are fuses or not in there.
Currently the garage has a single-phase supply, fused at 60 A, but there is a 4-core cable, as some of the cores were used to supply economy 7 heating, although that's not being used any more. The conductors are 16 mm^2.
