On Thursday, 24 November 2016 08:57:44 UTC, Bob Eager wrote:

It's just that there is an unconnected third switch in the multiple, and
someone who moves into the property later may wonder if something is
faulty if nothing comes on when the switch is operated. Maybe a double
switch would have been sufficient; a triple wouldn't exactly break the
bank if it was needed later, especially if the "spare" cabling wasn't
present anyway.

I would be wicked and label the third switch:

THIS SWITCH MUST BE LEFT 'ON'
DO NOT TURN OFF

But must be turned off for 5 minutes once a month. AND NO LONGER!


NT