Light Switch Wiring L1 L2 L3. A two way light switch is a simple single pole changeover switch with three terminals. You can use it as a one way switch by using the com and l1 terminals only.
Nb in light switches you are actually switching the live part of your circuit only so all of the cables except the earths even if they are different colours are actually part of the live not neutral. You need two of these switches. On the first switch com is the hot leg typically the black wire l1 connects to l1 on the second switch and l2 goes to l2 on the second switch as well.
In the other switch position it changes over so that com is connected to l2.
This may confuse you as. When you re wiring decorative light switches such as chrome or stainless steel etc you ll find that the switch will also have an l2 terminal which means it s a two way switch. Nb in light switches you are actually switching the live part of your circuit only so all of the cables except the earths even if they are different colours are actually part of the live not neutral. Some brands of switch may have slightly different labeling on the terminals such as c l1 l2 or even l1 l2 and l3.
