-------- Original Message --------
Subject: Re: Normal power supply Sweden & Norway
List-Post: [email protected]
List-Post: [email protected]
List-Post: [email protected]
Date: Mon, 20 Jul 2009 16:08:49 -0400
From: Robert Johnson <[email protected]> <mailto:[email protected]>
Reply-To: [email protected]
Organization: ITE Safety
To: 'Rich Nute' <[email protected]> <mailto:[email protected]>
References: <F0CDD9B9E06747A883C7A0B1A3BC9592@PC323541548743>
In Europe, there has been much more integration of business and residential
areas. Businesses, due to higher loads and motor loads, find 3 phase
important. In addition, transformers are likely to serve a larger geographic
area in Europe due to the lower current/higher voltage, thus more likely to
span a mixed zone. Three phase is far more efficient at distributing power
than single phase. Adding a third wire triples the power delivered.
In the US residential areas are often far removed from businesses and are
characterized by single phase loads. Lots of rural areas are served only with
a single phase (sometimes in the past even a single wire with a ground return)
and thus an expectation of single phase service has developed. Distribution
starts with three phase but thins to single phase when the loads are light and
spread out. No one here would dare to produce a residential three phase
appliance.
The 120/240 volt service developed from a 120 volt service to serve larger
loads since it is easy to derive from a single phase feed, will deliver twice
the power at the same current and still provide for 120 volt loads.
'Rich Nute' wrote:
Hi Ralph:
Is it common throughout Europe to distribute 3-phase power to
single-family
homes?
Well, yes. I'm not sure of England.
If so, why are single-family and duplex residences in North America
supplied with 120/240V single-phase?
I'm sorry, but I can't answer the question.
Best regards,
Rich
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This message is from the IEEE Product Safety Engineering Society emc-pstc
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<[email protected]>
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