To enable the light from two points, enough sometimes to finalize conventional switch. It is necessary to disassemble and install a third contact plate. This is done rather simply.
After removal of the switch housing is turned the screw holding the shift key and contact plate. Now on the basis of only the second contact plate fixed copper screws, symmetrically to which switch there is a ledge. In place of this ledge you need to drill a hole diameter 3.2 mm screw fixing for more contact.
And in the partition of the Foundation is to make a needle file cut. Of course, not "for beauty", and under the additional contact. For fastening same additional plate, it is desirable to use a brass screw.
The base of the switch with a fixed contact plates: 1 - additional contact plate (1.5 mm copper or brass), 2 - base switch, plate 3 pin main, 4 - screw MH (3 pieces).
The scheme of connection of the load to the network
Author: P. Belousov