There are only two conductors run from the substation to a normal one phase installation. Those are live and neutral. Though the neutral is bonded to ground at the substation through the resistor and is also connected to earth at any and all points on the cable where any work is done it is still neutral. At the house the neutral and ground become separate conductors. The neutral is treated as a live wire when working on the system, as far as I know all utilities treat neutral as another phase for safety reasons.
Rob, where would anyone ever get 10,000V from? Or even 1,000? Short of lightning strikes, these voltages don’t exist in the home, or in many factories. Why do those voltages matter?
Then when you step up a notch to the KV stage the safety rules change because air can now be a conductor.
I was mainly thinking about the diff between high vs. low RMS AC voltage but the discussion of AC vs DC has been interesting as well.
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If you use 24V for 120W, you only need 5 amps. That’s not much. A good mosfet shouldn’t even get warm at 5A, and you don’t need very fat wires.
To tout that you’re rigorous about tracking efficiency data, you completely missed a very important statistic.
My own maxim is that just because something can be – and perhaps often is – done poorly or hazardously does not at all preclude any possibility that it can be done properly and safely.
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I play around w/ HV/low amperage PSUs all the time, that stuff will make you lose control of your muscles…
There is no mention of what powers the module here, and I suspect it is a regular 5V, isolated SMPS. @RobHeffo suggests transformerless power supply, but that is not a good idea, for the current drawn by the ESP the capacitor will be too big. There are alternatives, like this guy, LNK306 : http://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf . It is not isolated, but the thing is probably the best cost option for such a device.
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