J
Jimes
- Jan 1, 1970
- 0
I was looking at the discussion here on Underground wiring, and one of the
comments there was to say ...
Some questions
(1) I understand the point about racking up the Voltage (ac) and as a
consequence reducing the amperage...but why does that mean a smaller
thickness wire is suitable? At the end of the cable, you have the same
energy available and by reducing the voltage, the amperage available goes up
as a consequence. It's the same 'energy' going in one end and coming out the
other, why does the wire size not have to be the same in both cases?
(2) Would there be any difference if one brings a DC Voltage into the
picture? I suppose the same technique cannot be used on a DC current as it
the very alternating nature of AC current that makes a transformer work. But
if one had DC devices (computers, lights, TV) what would be the
considerations of having a 12V supply running all over the house? Does one
get DC appliances (stoves / fridges / geysers) ?
Thanks
Jimes
comments there was to say ...
another idea would to use a couple of transformers, one on each end of
the run, to boost the voltage up to 480Vac and then back down on the
load end. Compare the cost of the transformers to the cost of putting
in a bigger pipe. Higher voltage = less current = smaller wire sizes
for the same load.
Some questions
(1) I understand the point about racking up the Voltage (ac) and as a
consequence reducing the amperage...but why does that mean a smaller
thickness wire is suitable? At the end of the cable, you have the same
energy available and by reducing the voltage, the amperage available goes up
as a consequence. It's the same 'energy' going in one end and coming out the
other, why does the wire size not have to be the same in both cases?
(2) Would there be any difference if one brings a DC Voltage into the
picture? I suppose the same technique cannot be used on a DC current as it
the very alternating nature of AC current that makes a transformer work. But
if one had DC devices (computers, lights, TV) what would be the
considerations of having a 12V supply running all over the house? Does one
get DC appliances (stoves / fridges / geysers) ?
Thanks
Jimes