What is the best way to achieve two or more place control with ordinary home lighting wiring? Can anyone tell me what wires to add between switches and switches. How to connect?

Mainly depends on your power incoming and outgoing wires of the lights, the number of wires to be laid in different locations will be different.

A. Assuming a two-ground control, divided into 1 and 2, if the power supply into the line for 1, and only into the fire wire, and the zero line does not enter the switch, the lights out of the line is also in the 1. Then 1 and 2 as long as the 3 lines between them, respectively, is a fire wire and 2 control lines. The fire wire is directly connected to the power supply into the 1 wire. And then connect the fire wire to the 2 dual-control switch com point (or L) on the other 2 control wires connected to the L1 and L2. In the 1 switch position the 2 control wires are also connected to L1 and L2, the center com (or L) is connected to the lamp control wire.

Two. Assuming that 1 for the power inlet, 2 for the lamp outlets, the zero line connected to the lamp, then between 1 and 2 as long as 2 wires, 1 of the power supply line connected to the switch 1 com (or L), the two switches between the two wires connected to the two switches on the L1 and L2, and 2 switches of the com (or L) is connected to the control line.

Three, assuming that the incoming end of the 1 and is a fire zero double line, and the lamp line is also in 1, then 1 and 2 are only three lines between, as long as the incoming zero line and the lamp zero line directly to the fire wire and a connection of the same way.

Four. Assuming that the power inlet fire zero double line in 1, and the lights out of the line in 2, then switch 1 and 2 between the line should be used to 3, respectively, is the zero line and 2 control lines, 1 switch COM to the fire line, L1 and L2 to the control line, 2 switches L1 and L2 to the control line, COM to the lamp line, the zero line connected to the zero line of the lamp.

Five. Three or more ground control is also to consider the location of incoming wires and lights out of the location you can apply by example. Three ground and multi-ground is based on the 2 ground control and then add an intermediate switch in the middle. Or more intermediate switch