Try measuring the voltage between L and N when the light is switched off. I'll bet it's not zero.
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Voltage across L-E when the light is off reads zero volts
AJJewsbury:Try measuring the voltage between L and N when the light is switched off. I'll bet it's not zero.
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Voltage across L-E when the light is off reads zero volts
Presumably with "lamps in" or equivalent - i.e. the SL is shunted to N by the load. With no load on the SL you're likely to see a similar apparent voltage on the SL when the switch is off.
Ah yes, I first discovered this on a 2 A socket, but I have also found it Between the pins of an ordinary lamp holder. Clearly in both circumstances, the load was removed. IIRC, there was a current of about 1 mA.
That was between L and N, not L and E and in both cases on 2-way lighting.
AJJewsbury:
Indeed - see also all the reports of low energy lamps flickering or flashing when switched off.
When my eyes are dark adapted I can see the CFL flashing above my bed. No two-way lighting there. It is very feint and I doubt that it would be seen otherwise.
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