Re: Re: Mains installation in garden

[Chris Hunter <cjhunter@xxxxxxxxxxxx>]

in proportion to area (ie: diameter^2) rather than diameter, I think
...

so 4mm2 => 4x4 / 2.5x2.5 = 16 / 6.25 => a bit better than halved ....

(sorry, 'being pedantic)

Chris


On 9 May 2007, at 00:31, rb_ziggy wrote:

> Yes, I think you hit the point there.  I'd not grasped that a doubling
> of diameter halves resistance.  The max distances I was quoted were
> based on 2.5mm2 wire.  The company also does a 4mm2 wire.  Looking at
> that it may just be ok for a 14m run.  Mind you 4mm2 strikes me as
> pretty chunky stuff. I'll check with them tomorrow.
>
> --- In ukha_d@xxxxxxx, "lexfordparc" <paul@...> wrote:
>>
>> The problem you have got is low-voltage is not very good for
>> supplying
>> power over long distances because of the losses in the wire. Now
you
>> can get round this problem to some extent by increasing the
>> diameter of
>> the wire carrying the current as this will decrease the resitance
in
>> the wire. A qualified electrician should be able to advise if you
can
>> persuade them you don't want to run a mains cable from the CU.
>>
>> Have a look at the following link for better explanation of
distance,
>> gauge and resistance:
>>
>> http://www.epanorama.net/documents/wiring/wire_resistance.html
>>
>> Paul
>>
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