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If you ask for a three phase supply, you will find it is only very slightly more than a single phase one. It makes no difference to the DNO at all, BUT and it is a VERY big but, they would MUCH rather give you a three phase 60A supply than a 100A single phase one, because they have to spread the...

Three phase would be great but I will see how the costs work out. If they're going to bill me for a transformer it might be too expensive. If it's just another 100A SP supply run from the current transformer 30m to where I can put a new box in it might be very cheap. I'll have to see how it goes.

My family member that just had their 100A SP supply in to the new house had a 185mm 4 core cable put it by the DNO the length of run was 298m helpfully! All buried. 

Thanks John that's a heck of a lot to think about. But all great information. I'm now going to talk to my electrician, work out my usage and diversity and in particular talk about three phase or single phase. I think I would be OK on a new 100A single phase supply for the yard. And keep my old...

That's heartening news. I really do need a site visit from an engineer. How do you go about getting one? Do you just write on the form that you would like one? Yes I'm in essex so uk power networks for this area

Ok I may be wrong about having to go to uk power networks... Could I use an ICP? an independant connection provider? If so I could contact various companies to discuss and get various quotes to bring the price down before contacting uk power networks for their quote

Has that been your experience with organising new supplies? a mate who has just put in a TP 100A supply about 100m cost him £16k but he did need a couple of permissions and one to get across a railway. He was given that advice by somebody who works for the power company I think putting in new...

I'm working up the courage.. Also as I previously mentioned I've been told if you don't go with their first quote they batter you with a higher quote the second time round

I'd be very interested to learn what that set them back thank you!

Sorry tony s the picture hadn't loaded when I read your comment I understand now. Any ballpark estimate as to cost of a small 3ph pole mount transformer?

you're right it doesn't give me much gain. I would have a 100A supply to the house instead of a 80A but it would depend on the costs of paying two supplies vs just one. As for hmrc it can be calculated during the accounts so I wouldn't expect much problem there. If I save £150 a year or...

 Are you saying you think 100A TP is OTT? What do you think would suit me then in your opinion?

ok here's another question. If I got my 100A TP I think that would be enough to do the yard and my house. So would I ditch my current single phase supply completely? It would save paying two bills. Or is there any benefit to having the three phase supply for the yard and keep the old 80A supply...

Purely Out of curiosity I know it's uk power network gear but does anyone know if that transformer be used to give TP 100A? Or would it get chucked and a different one put up. 

Here's the picture as requested  thank you for that last post lurch that was very informative. I feel more confident about contacting uk power networks now. 100A three phase is the ultimate for me then. I wonder as a 300m of 120mm 5 core would be very expensive up to £9k. I could see if a HV...

No it's just a small boatyard situated in Essex. With mudberths a couple of pontoons and jetties. Serving say 15 boats shoreside then another 20 boats on the hard standing. But this will hopefully grow a little so I'd like to future proof if I can. I have three workshops (wood shop, metalshop...

Ok fair point sidewinder I'll put down what I need to get out of this new supply. 30x10A sockets 8x16A sockets 2x 32A sockets (for the welder) 4x6A lighting circuits. i would like to run a winch for my slipway but haven't looked into this yet it's difficult without TP. Not crucial... The...

Thanks prodave I will remember that. So 60A supply gives me 3x 60A single phase circuits if needed.  So so back to basics.  1. Could I ask for a new seperate 150A SP supply to a second meter? Or will supply company only supply 100A? 2. Could I ask for a 60A TP supply to a second meter? 3...

Sure is! About 20-30pounds per meter at a guess.. Makes it 6-9 grand. Ouch! Still if 100A TP gives me 300A SP then I could cut down to 50A-60A TP which would still give me plenty for my needs. And may half the cost of the cable. When you request three phase for a supply could you request a 60A...

Ok great so on a very rough estimate what cable size might I need for a 300m run of three phase? At 100A. Would it be 4core swa? Is the armouring used as an earth? I guess there may be completely different earthing arrangements for three phase... all I'm wondering is if there's an option to use...