Thickness of new underground cable?

[LandcruiserLad]

Who's advice should I take? Kinda why on here.

 

[Exfarmer]

For cattle yards , ie lighting ( led) pressure washer etc possibly 3 hp motor on compressor, i can see little reason to go beyond 30 amp feed.
This would only require a 16 mm cable.
You would need to be careful not to overload any single phase though
I think your sparky is making work, and cost.

 

[renewablejohn]

Very simple just put in what you actually need at this point in time however while the trench is open lay 3 extra trunking pipes with ropes inside. Then use single pipe for small expansion but you still have the option of a large expansion by installing a single phase per pipe.

 

[LandcruiserLad]

Could you pull a cable through 450 metres through a trunking pipe? Is there something on the market which makes this easy?

 

[Sharpy]

Could you pull a cable through 450 metres through a trunking pipe? Is there something on the market which makes this easy?

The professional guys winch cables through.

 

[Still Farming]

Could you pull a cable through 450 metres through a trunking pipe? Is there something on the market which makes this easy?

tractor ?

 

[bobk]

Assuming 70mm swa , 500m would weigh just over 2 tons , need a good rope to pull that through

 

[renewablejohn]

Assuming 70mm swa , 500m would weigh just over 2 tons , need a good rope to pull that through

Easy enough with a winch and the correct pulling head.

 

[f0ster]

63A at 400VAC three phase comes in at 70mm for 500m with 5% volt drop. the dno uses their own type of cable which cannot be bought, it is unique to them and it cannot be used because you cannot carry out testing to electrical standards on it. they can get away with a smaller size of cable for a given load.

 

[Sharpy]

63A at 400VAC three phase comes in at 70mm for 500m with 5% volt drop. the dno uses their own type of cable which cannot be bought, it is unique to them and it cannot be used because you cannot carry out testing to electrical standards on it. they can get away with a smaller size of cable for a given load.

Who is dno?

 

[chickens and wheat]

sparkies dont like long lengths of cable in ducts need soils contact for cooling

 

[jcb360]

sparkies dont like long lengths of cable in ducts need soils contact for cooling

Select "Direct in ground or in ducting in ground" on the cable calculator I posted earlier.

No problem with a duct in ground.......

 

[f0ster]

Dno. district network operator

 

[24/7 farming]

Defo leave at least 2" duct in the trench for future-proofing, and pull two draw ropes, don't think cat-5 will be much cop over that distance tho, prob be looking at a fibre cable, which ain't that dear I don't think, would be handy for likes of security if ever needed

 

[jcb360]

Dno. district network operator

https://en.m.wikipedia.org/wiki/Distribution_network_operator

 

[LandcruiserLad]

63A at 400VAC three phase comes in at 70mm for 500m with 5% volt drop. the dno uses their own type of cable which cannot be bought, it is unique to them and it cannot be used because you cannot carry out testing to electrical standards on it. they can get away with a smaller size of cable for a given load.

So there is no point doing what I'm suggesting? And placing ducts underground are the only option?

 

[LandcruiserLad]

The size of the cable increases as cable length increases - for the same current.

http://www.doncastercables.com/technical-help/

There isn't an option allowable for armoured cable.. don't you think it should be armoured?

 

[jonny72]

I would definately put in a duct for future proofing and fibre £5-8 /metre and just put in what you need, you can always add another of the same size and parallel them if required in future

 

[jcb360]

There isn't an option allowable for armoured cable.. don't you think it should be armoured?

When you select 60 Amps at 500 m in a duct in ground, calculator suggests:

Multicore 90°C Armoured Thermosetting Insulated Cables

 

[Doing it for the kids]

Wi Fi link may be cheaper for data than fibre.

What ever cable you lay put lots of ducts in, cheap and future proofing