Need to extend wiring in holiday let that is adjacent to workshop with three phase supply. Currently the holiday let has a two way cosumer unit fitted with RCD and 32A mcb for power and 10A mcb for lighting. This is fed from a 40A circuit breaker off the three phase board.
The three phase board is fed via what looks like a 10mm SWA cable protected by a 63A switch fuse from the house.
The workshop has a couple of three phase machines but is only used on a hobby basis and load is well down and also won't be in use while the holiday let occupied (noise). There are a couple of spare ways in the board that could be used for the extended wiring (cooker and hob) and possibly another ring main. However this would mean that there would then be 415 volts in the holiday let. It may be possible to split the circuits between floors to minimise this. Obvious concern is that with max 63A have to split the load across phases for this to work.
Is 415v OK for domestic premises? What additional requirements are there, if any?
The three phase board is fed via what looks like a 10mm SWA cable protected by a 63A switch fuse from the house.
The workshop has a couple of three phase machines but is only used on a hobby basis and load is well down and also won't be in use while the holiday let occupied (noise). There are a couple of spare ways in the board that could be used for the extended wiring (cooker and hob) and possibly another ring main. However this would mean that there would then be 415 volts in the holiday let. It may be possible to split the circuits between floors to minimise this. Obvious concern is that with max 63A have to split the load across phases for this to work.
Is 415v OK for domestic premises? What additional requirements are there, if any?