Not so, as all four other readings agree, near enough, with what both your protocol and I said they should be.
Clearly, this isn’t true, since in both cases we measured a voltage of less than 0.3V between E and N.
Agreed—which is why we took all of the other measurements as well and reported them here.
Again, not true, since each of the other four measurements is in agreement with what we both claim they should be.
I understand RMS quite well in the context of wave phenomena, among which are AC measurements and voltage/current specifications: You integrate the square of the voltage amplitude over a full wave period, divide by the length of that period, and take the square root of the result. For a sinusoidal wave as is AC, this works out at 1/√2 of the magnitude of the peak amplitude, and 1/√2 ≈ 0.707. If you have three-phase power in your home, the RMS voltage between any two of the three phases is nominally 380V, whereas it’s 220V between any one phase and neutral (380/220 is near enough a factor of √3, which also isn’t a coincidence). But this fact alone already seriously challenges the claim that “The neutral is always at a 220V potential above earth if the power is supplied…” since the three phases are shifted by 120° relative to each other.
Here’s a pair of photos showing what was measured at a different plug in respect of the two contested readings. The other four readings were, again, in agreement with what we saw before:
In each case, you can see whether the plug is switched on or off, which poles are being measured, and the reading on the multimeter’s display. It will be noted that the readings are in “mV” or millivolts; in volts, that’s the reading divided by 1,000.
Consequently, I still remain at the point where I began.
My suggestion in order to put this matter to rest is that some other forum regular performs these same measurements and then reports their findings here independently.
Will someone please step up to the plug? I mean “plate.” Anyone? Please?
'Luthon64