I do a lot of technology work for a large country house in the UK. We're currently looking at getting electricity 150m up the garden.
Despite being a residential property, the electrical supply appears to be 3-phase (the main supply cable looks to be about 50mm diameter and there are Danger 400V warning signs around it.) Given that we might want to run large events in marquees at the site, it seems sensible to try to dispense of the need for generators and get 3-phase up there if possible. We would prefer to bury it but can run it above ground if necessary. It would terminate in a well-constructed, waterproof timber building I'm hesitant to refer to as a shed.
So my questions:
- Compared to solving this problem with a high-current single-phase installation, are there likely to be any extra costs or regulatory hoops to jump through to do it with 3-phase?
- Can we legally terminate it in our timber structure and distribute both 3-phase and single-phase sockets from there?
- Do we need to get permission from the power company or any regulators?
And for the record—no, I'm definitely not going to attempt any of this myself; I just want to know what I'm talking about before I start calling electricians.