Robert: The leds are not fed by the neutral wire on the (poor) schematic. The ground wire is. Even when both neutral and ground conductors are tied together at the breaker box. Waste of a conductor. Never got the full rationale of such.
Dale: Agree with phase being the one to be switched, for safety. But seen many old house installations where by routing convenience of the then electrician, the neutral was switched for the light fixture. And by the schematic, leds are on all the time. Some older houses do not even have the ground wire.
gerty: Agreed. Having another conductor available for the leds would be feasible on new construction only, could not be implemented on an existing wiring. And those 3 way $witches could be implemented by still having to add an additional wire on an old construction, not a simple task.
The thing is to implement the leds with minimum of alterations... Well, I will not tell the inspector...
Some wall switches have a neon lamp in parallel to the switch, it is a nice feature to locate the switch in a dark room.
Now, that poses a shock risk by presence of phase at the ceiling bulb socket when switch is off, and it is an approved device. (or is it not in US ?)
If yes, a pair of (white) leds could be implemented same parallel way at the wall switch cover to both locate the switch in darkness and providing faint illumination to the room when the incandescent is off.
Any different electrical code attitude towards a few milliamperes by led implementation and a fraction of a milliampere as with neon ?
Edited - added ---> idiot priced lighted switch ---> http://www.ebay.com/itm/HUBBELL-HBL1221 ... 0810282615
Found someone already markets my plan : http://www.prweb.com/releases/2005/12/prweb319601.htm