This has been the subject of a discussion on the amps reflector about 2 years
ago.
To recap;
In Sweden at least, almost all distribution to domestic housing is 3-phase 400V.
In newly built areas (1960's onwards), it is underground cable distribution,
and the fusing to individual "drops" is maximum 63A if electric heating is
common in the area; 35A elsewhere.
Depending on the electric consumption habits one selects the appropriate main
fuse rating, as the fixed
part of the electric bill depends of its size. For a common housing size (140
sq meters) and electric heating
25 A is common, if you use other forms of heating 16A.
Newly built apartments have 3-phase mains "drops", but usually the only
accessible 3-phase outlet is to the
electric stove. Older apartments can have a single-phase "drop" with a 20 A
fuse to power an electric stove
via a special fixed connection, as the maximum size for a 230V outlet is 16A,
and then only if the round CEE connector
is used.
Continental European power networks are dimensioned to be very "stiff". The
maximum load regulation allowed according to the Swedish "electrical code" is 4
%, but this is very seldom encountered.
I live myself in a house with overhead power distribution (built in 1938) and
25A main fusing.
The house is equipped with a 14 kW electric furnace as a "backup" if the
"heat-pump" heating should fail,
and I have tried to measure the load regulation by switching this load and the
electric stove on and off (total about 22A load change). A voltage change of
about 8 V referred to the 400V nominal voltage (2 %) was the worst case
encountered during a few trials last winter.
Quite impressive "amps" can be run from "drops" this size.
I have witnessed the successful operation a few years ago of a Collins 208U-10
from a rural power
network with 25A (slow) fusing. It only took the installation of step-start
device on the blower motor (!)
and a lot of care during "tune-up".
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: "Bill Turner" <dezrat1242@ispwest.com>
To: "Osten B Magnusson" <sm5dqc@areteadsl.se>; <amps@contesting.com>
Sent: Monday, January 02, 2006 5:16 PM
Subject: Re: [Amps] How about this furnace?
>
> ORIGINAL MESSAGE:
>
> At 07:09 AM 1/2/2006, Osten B Magnusson wrote:
> >3-phase has been standard here in Sweden for many
> >years...
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Do you mean standard in homes or standard for distribution, or both?
> Here in the US three phase is standard for distribution but not in homes.
>
> 73, Bill W6WRT
>
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