Method 1: the traditional safety connection, one of the double line must be directly connected to the two double switch in the middle of the indirect terminal, both switches are connected to the fire wire;

Method 2: another is the wire-saving method, although it can save the wire but the safety hazards are very large, it is relatively easy to cause a short circuit. Through the different terminals connected to achieve different results, wiring diagrams have a fire line and zero line, in the wiring must be clear about the function of each terminal and connection.

Duplex switch is divided into duplex single control and duplex dual control two kinds, single switch is a combination of two single open, control two points of light, duplex dual control switch is mostly used for two positions on a point of light switch control.