"Ron(UK)" wrote in message
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Seán O'Leathlóbhair wrote:

It is a landing light. There are three switches, one at each end and
a third in the middle where a small corridor from the bathroom joins
the landing. All simple on off switches (well they must be changeover
switches but, from the user's point of view, they are just on off).


Sounds like leakage to me, there may be a measurable voltage floating on
the neutral. I has a similar problem with fluorescent emergency lights
last year. If you are in the UK it might be an earthing fault.


I am in the UK.

How does an earthing fault affect the lighting circuit? I thought it
was just two wire. The earthing for the house in general was checked
a couple of years ago when we changed the boiler. The gas engineer
said that a change was required but I forget exactly what that was.
The RCCB in the new fuse box is not tripping but does it apply to the
lighting circuits?


If the neutral wire isn't properly grounded enough voltage can be induced
by or leak from other 'live' circuits, maybe enough to cause the
fluorescent fittings to randomly flicker. It could be a faulty switch
leaking across the contacts.

You don't live beneath an electricity pylon do you? It might also be the
rays from guvmint mind control experiments entering your house.

Ron(UK)

Ron - just a quick aside. It was you that I was talking to a few weeks back
about the old ILP audio modules, wasn't it ? Well, thought you might be
interested to know that the next issue of Elektor ( that'll be the September
one as it is currently the July / August Summer Circuits double issue ) is
doing a review and lab tests of a number of available pre-built audio
modules.

Arfa