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This is a very smart design, I shall consider this in my lab power supply or for those repairman.crutschow said:And in the U.S the 220V is generated from a transformer with a center-tap that is the neutral/ground. You get 220V by going across both hot leads. You get 110V by going from either hot lead to neutral/ground. This is a safety factor since, if you are grounded and touch either lead of a 220V outlet, the voltage will only be 110V.
Hero999 said:if an earth fault occurs on the 5kV output the mains would float at 5kV which would cause insulation breakdown and a fire.
What does an earth fault mean ? when neutral has lifted for some reason on the secondary or the primary.
VictorPSIn an AC 240V supply , there is Live and Neutral .
When we touch the Neutral , we will not get electric shock.
RetiredHAL said:VictorPS
That is true IF the MEN strap is in place at the entry point in Australia (strapped Earth bar to Neutral bar)
I am probably stating the obvious here, but the fact that there is no voltage relative to Earth does not mean it does not carry current. You cannot open the Neutral and expect not to get a shock. The moment you open the neutral there can be line voltage on the neutral side of any appliance that is switched on.
As an aside, the neutral in an office block may carry almost 1.7 times the current that is present in any single phase due to triple N harmonics currents generated by non-linear devices such as SMPS , Fluoros and general sloppy balancing of phasing loads . Early installations (before smps and other computer loads) had a neutral wire that was only as big as the phase wire. I have been in installations where the Neutral Conductor was running quite warm in the cable and switchboards.
I think that modern installations now require a larger diameter Neutral .
The main point here being (use a meter to check before you touch any bare conductor) Especially in dual or triple switched lighting ccts (the convenient ccts where you turn on and off the lights at different switches)
Cheers
RH