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Old 9th Oct 2017, 8:08 pm   #5
julie_m
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Join Date: May 2008
Location: Derby, UK.
Posts: 7,735
Default Re: Strange phenomenon involving CFL bulb

Perhaps the CFL has a class X capacitor or other suppression components, and is -- by happy accident -- cleaning up the whole ring main when it is switched on?

It's even possible that the inductance of the mains wiring to the lamp is forming a tuned circuit that, together with the class X capacitor in the lamp, is absorbing the interference. Does it still do it with the lamp plugged into a different socket, or through an extension lead, so there is a different length of wire in play?
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