XPost: alt.home.repair
On Tue, 3 Dec 2013 22:36:50 +0000 (UTC), andrew@cucumber.demon.co.uk
(Andrew Gabriel) wrote:
>In article <529e37f2$0$46490$c3e8da3$a9097924@news.astraweb.com>,
> bud-- writes:
>> The context is, specifically, in US power distribution is a split-phase
>> supply called 2 phase with a phase A and phase B.
>>
>> (Not "2-phase", which as you say is rather different.)
>>
>> I don't think you have much split-phase over the pond.
>
>No. 240/480V was only used on farms in very remote areas,
>and there were probably no new installations of this type
>since WWII (and there maybe none left by now, having all
>been upgraded to 3-phase).
>
>It's not necessary elsewhere here because we run 230V 3-phase
>down each street, so houses which need more than 1 phase get
>a 3-phase 230/400V supply. (In reality, it's 240/415V for
>historical reasons.)
We run 3-phase down most streets, too. In many places, each house has
its own transformer. Three-phase makes distribution simpler but
split-phase gives the flexibility that you have, using more than one
phase, in a simpler manner.
>That doesn't work with the US 120/240V, because, to a first
>approximation, you can only carry it a quarter of the distance
>before the voltage regulation goes too bad (and the low power
>pole mount transformers actually make this much worse).
Irrelevant.
>This means you have to carry the high voltage supply down
>each street and use regularly spaced pole transformers to
>generate the 120/240V supplies. To keep costs down, there's
>usually only 1 of the 3 phases from the HV supply carried
>down each street, so you don't generally have access to a
>3-phase supply in any one residential street.
Wrong. Except in rural areas, the 3-phase HV *is* distributed on each
street with, at most, a few houses on each transformer. In rural
areas they may only have one phase on the pole but there is a
transformer there, too.
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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