Do I need to run an earth cable to house?

[gavztheouch]

Im planning on building a new house next to an existing farm shed with 3 phase electric supply. I have a 3 phase solar installation so Ideally I would like to have three phase in the house. If I run a new cable to the house from shed I'm not sure if I also need to run an earth cable, so I need a 5 core or 4 core SWA. 4 core would be cheaper if I do the earth separately. I could use the SWA armour to carry the earth cable? or place an earthing rod at the house? 

[Mattg4321]

There’s various considerations to make here. Earthing system, expected load for new house, bonding requirements etc. Get an electrician involved at an early stage would be my advice. Or get a decent size duct in, with a rope through it. 

[Susie]

I’m not sure you can take the power from one barn to a new build house. 
 

we have a barn with 3 phase that used to provide power to the barn we have knocked down. We will reinstate temporary power from barn to new build but the new build will eventually require its own separate 3 phase supply.  We will have solar on the new build and it will need its own supply for local electric board. 
 

not sure what the rules are in Scotland does the existing 3 phase only supply one barn and do you have any high pulling fixtures ie mills, lifts or compressors anything that your suppose to tell electric supply about that might cause a surge. 
 

Our 3 phase enters existing house then goes to barn(s) that’s ok and a few buildings are earthed.   You need to think where it goes first and that only one home is on each connection.  The second house needed it’s own supply. 
if we get spare solar power rather than a battery we can send it to a barn. 
 

3 phase needs careful balancing if your not sure it’s always best to get advice from a qualified electrician, industrial or commercial electricians tend to know more about 3 phase than domestic electricians, unless your in an area everyone has 3 phase. You can search here for a good electrician https://niceic.com it’s like corgi or gas safe but for electricians. 
 

 

 

[gavztheouch]

Thanks for the advice. I am also unsure if there is a legal reason that will not let me run power to the house from the barn. 
 

I use a lot of power in the shed during the summer maybe 4 weeks in total then everything is turned off for the year. My plan was to install batteries and solar in the house so it is almost off grid. Then the power from the shed is more like a trickle charger. 
 

I have enough equipment to blow through my available capacity and I need to think about what to turn on when and will it exceed my capacity I have reserved on the network. This is common sense. The transformer is sized to give me double my needs so there is no concern there.