"Jim Michaels" wrote in message
...
On 07 Jul 2005 07:50:51 GMT, andrew@a17 (Andrew Gabriel) wrote:
In article ,
Jim Michaels writes:
On 04 Jul 2005 18:17:37 GMT, (Andrew
Gabriel) wrote:
In article
.com,
writes:
Youre not understanding safety margin. Size of cable has
nothing to do
with it, once the cables big enough not to overload. Ours are
big
enough and much more. Yours are even bigger, but for what? Its
just
poor engineering.
Because voltage drop is a serious issue for 120V supplies.
It's not for 240V supplies.
No, Our supplies are also 240V
Nope -- you require regulation mostly at the 120V level.
This is getting tedious.
We have a 240Volt supply to our homes!
It is the Edison 3 wire balanced system, where there are two power
conductors 180 degrees out of phase (240V between legs and 120V from
each leg to neutral/earth) and a neutral conductor at nominally
earth
potential.
Therefore for a home which normally has a reasonably balanced load
(see diversity) the voltage drop from the CU back to the generating
plant will be the same as a British/euro 240V single phase delivery
system.
As far as small branch circuits go, many are multi wire circuits
with
two hot legs and a neutral that only carries the imbalance between
the
loads. (see diversity) When balanced the voltage drop is EXACTLY the
same as your 240V to earth supply.
ALL large loads operate at 240V and therefore have a voltage drop
and
current the same as any other 240V system.
Voltage drop is NOT a significant issue in US residential wiring.
You seem to want there to be problems where none exist, and to
magnify
small problems into disasters.
Remove SPAMX from email address
Lots of disasters in the early days. Very interesting article at:
http://www.swehs.co.uk/docs/news25su.html
All about Sebastian de Ferranti's early championing of HV AC
distribution. Descriptions of the Ferranti / Siemans zig/zag 10,000v
alternator. In the mid 1970's there was an example of this machine in
the foyer to Ferranti's 'Wireworks Factory' at Moston in Manchester
where I spent several months commissioning computers.
AWEM