Armoured cable

[DougR]

Following all the advice I receved I have checked everything again. The builder had said that the disctance was 350meters. After I physically checked it turns out to be just under 200 meters. The original price from the Scottish and Southern was £13000. If we dug the trench it came down to £8500. The only point I am not sure of is the size of the SWA we would have to use over that distance. I have had online quotes of £1041 for 16mm and £1430 for 25mm.

As there is planning permission for one house next door should I be thinking of putting two lines into the same trench as the trench will cost more than the cost of the line?

 

[bongos]

It would have made more sense to continue this on your other post as newcomers might have no idea what's already been said.

After I physically checked it turns out to be just under 200 meters. The original price from the Scottish and Southern was £13000. If we dug the trench it came down to £8500. The only point I am not sure of is the size of the SWA we would have to use over that distance. I have had online quotes of £1041 for 16mm and £1430 for 25mm.

This goes back to one of my earlier questions. What size supply are you wanting to install? Will you be heating by electricity or some other means? Is it a large house? Any outbuildings requiring specialist power or 3 phase pumps etc (unlikely but worth considering before you splash out so much cash).

Also, what supply do you have available to you? 3ph/split phase/single phase?

As there is planning permission for one house next door should I be thinking of putting two lines into the same trench as the trench will cost more than the cost of the line?

Definitely! If you are expecting to be building on the other plot at some point then it would be wise to lay the cables now while you have easy access.

I think you would probably have to put a larger cable in though, rather than two of a smaller csa due to external influences between cables (if i'm wrong here i'll be corrected though!).

It might be an idea to ask the mods to add this to your other post.

 

[sparkwright]

Can't the DNO tell you what size cable you require?


Tell them the length of cable run, and the type of requirements you have like number of electric showers etc?

What type of dwelling is this?
Any large workshops, etc?
Would 3 phase ever be required?
Is this just an ordinary house?

 

[DougR]

We will be using a woodburning stove tied into a underfloor heating system and solar panels for hot water, there will be a back up oil heating system but we dont plan to use it much. The house is insulated to meet latest building regs. It has 234 sq mtrs of floor space and 4 bedrooms.

There will be a double garage but I am not planning to have a workshop etc.

 

[1john]

http://www.doncastercables.com/cableCalculator.asp

Phase - Single Phase
Power - 23 kilowatts / 100 amps
Length - 200m
Core Size - 185 mm²
Voltage Drop - 5.8 volts

just a rough guide for you.

 

[1john]

or ....

Phase - Single Phase
Power - 23 kilowatts / 100 amps
Length - 200m
Core Size - 95 mm²
Voltage Drop10.4 volts

 

[RF Lighting]

The DNO tend to use concentric cable with an aluminium line conductor, so trying to size up SWA is completely pointless.

Ask the DNO what size and type of cable they require. They are the only ones who can tell you this. We can not.

 

[ban-all-sheds]

I have had online quotes of £1041 for 16mm and £1430 for 25mm.

Well, assuming a 3% target voltage drop, those sizes will give you a capacity of 12A and 20A respectively.

As there is planning permission for one house next door should I be thinking of putting two lines into the same trench as the trench will cost more than the cost of the line?

Check with a property/land price expert how much that will add to the value of the plot.