LED

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 Mefiante (October 26, 2017, 11:07:17 AM):
Thanks, BM, much appreciated. So, bottom line is that your readings agree with ours.

'Luthon64
 Rigil Kent (January 19, 2018, 11:02:01 AM):
What many fail to remember is that the return conductor, the neutral, always has a voltage of 220V.
But .... then surely no current would flow once the live wire is opened.(The potential difference between the live and neutral - each sitting at 220V relative to the ground if I read the statement correctly - would be zero or close to it.) This too little too late, of course, since the empiricists have already done their thing.
 Mefiante (January 19, 2018, 12:09:06 PM):
But .... then surely no current would flow once the live wire is opened.(The potential difference between the live and neutral - each sitting at 220V relative to the ground if I read the statement correctly - would be zero or close to it.)
Bear in mind that we’re dealing with AC so the above would only be true if live and neutral are perfectly in phase (assuming that both are at a potential of 220V RMS above ground). For comparison, with three-phase power where the phases are shifted by 120° from one another (3×120° = 360°), the RMS potential between any phase and ground is 220V, whereas it’s 380V between any two of the phases. (It’s no coincidence that 380 ≈ 220×√3.)

'Luthon64
 Rigil Kent (January 19, 2018, 20:45:52 PM):
True ... the buckets must move up and down together.