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Old 12th Oct 2017, 9:55 am   #21
russell_w_b
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Default Re: Strange phenomenon involving CFL bulb

The input mains filtering on some of our test equipment consists of capacitors from live and neutral to a common earth point, so there's effectively a capacitor (at half-value WRT the L-E and N-E caps) from live to neutral. But the earth is effectively the neutral without the voltage drop across the impedance of the neutral wiring (except under fault conditions).

And if the filtered equipment was fed isolated from earth, it needs to be across both live conductors to work, there being no earth point.

In a domestic situation (which may have different N-E configurations depending on where you live), I suspect the L - N filtering would be subjectively better than a L - E as it would be directly across the source of interference without the included impedance of the N - E connection.
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Old 12th Oct 2017, 12:47 pm   #22
PaulR
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Default Re: Strange phenomenon involving CFL bulb

Thanks Russell. Thank makes it rather easier.
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