On 11/25/2014 11:06 PM, Holm Tiffe wrote:
Chuck you don't know better, so it is ok for you.
Holm, I do bristle a bit at that one. I've worked with industrial
distribution as well as residential--there is a huge difference. In the
industrial world, motors dominate the workload--even in a high-tech
office building, HVAC accounts for a very large portion of the
electrical load. In residential applications, the big consumption is
from lighting and heating--although I wonder sometimes
Cooking doesn't account for much in most households. I have an
induction cooktop installed, which is vastly more efficient that
electrical resistance heating--and more controllable. I asked my local
utility if there was an energy credit available for that--the response
was that cooking accounts for perhaps 2% of the average household energy
budget, the choice of one over the other yields very little difference
in the overall picture. So trotting out the cooker as the prime
example of efficient 3-phase use isn't really relevant.
To me, your argument is a matter of small degree. How many household
appliances do you own that are multiphase? So we do the single-phase
breakout before the final distribution transformer, Germany does it after.
My vacuum cleaner isn't 3-phase and neither is yours. Why aren't you
distributing 120 Hz (or any other frequency)--transformers would be
smaller, you know. Both our transmission systems are 3-phase.
As far as distribution voltages go, there's nothing to stop a homeowner
from wiring all of his receptacles for 240V (it
conforms to the National
Electrical Code); the problem is that there would be
little he could do
with it, as most of our small appliances are constructed for 120V (or
thereabouts). But he can purchase 240V light bulbs, if that is my
choice--it will cost more, as that's not the dominant standard here.
In fact, many, if not most small electronics here (TV, computers, etc.)
use SMPSUs, so distribution voltage matters not a whit as far as they're
To me, it seems that this is a Lilliput-versus-Blefuscu argument.