On Sat, 10 Mar 2007 20:54:17 GMT, "The Medway Handyman"
wrote:

Will a normal dimmer switch work on a two way circuit? e.g. 3 core & earth.

Define "normal". Older ones wouldn't, the current production ones do
(and are labelled as such).

OTOH, modern dimmers seem to have negligible resistance to peak currents
during bulb failures killing them 8-(