Cornelius Cretu
Hi Thomas, It will make no difference regarding the energy consumption if you use a monopolar or a bipolar switch for a lamp. The bipolar switch will cut off both live conductors (line and neutral) so you'll feel safer knowing that both conductors are switched off. Many appliances must use bipolar switches(fused connection units) to make sure that in case of reversed polarity both of the live conductors are switched off. Most of the switches only switch off the Line conductor because in most cases the feed is run to the light fitting in the ceiling. In new builds, the feed is taken in the switches but the neutrals are not connected in the switches but are put together in a connector block. To be on the safe side use a double pole switch. Regards,