What Does Common Mean On A Light Switch

The other terminal is marked as l1 and is the output to the light fixture.

The com terminal means common it is the terminal that can connect to either l1 or l2 depending on the position the switch is in. See 4 way switch for how it is wired. This is only way to have a common terminal. It s either on or off thats all it does.

The darker terminal is known as the common connection of the switch. 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. Depending on where the switch will be in the circuit layout the purpose of this common connection is to deliver electrical current from the power source the circuit breaker box either to one of the switches or to deliver the current onward from the second switch to the light fixture. One way light switch mechanism a one way switch has two terminals its the simplest of switch arrangements.

The common wire is the only wire that needs to be attached to a particular screw often the dark one on the 2 way switch. L1 and l2 never connect to each other. Location does not matter. Your house wiring works on the same principle just on a larger scale and at higher voltages.

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Two way switch uk light switch a two way switch for switching a light from two different locations like in a hallway has a common c a l1 and an l2 terminal. The other configuration uses a double pole double throw switch. A one way switch or a two way switch end of. While the common wire must be connected in a specific location on the two way switch the traveler wires may be connected to either of the remaining terminals.

The common is for the live wire that supplies the input voltage to the switch. If the switch is to be used for normal 1 switch location connect the other wire to l1 so that the switch is the right way up for on and off. The l1 is the switched live going out to the light they will be marked so you can tell which is which. Well as far as light switches or gangs are concerned they can only be one of two things.

The common is usually a wire used on a 3 way switch in this situation it would be either the hot wire or the switch leg meaning the wire that runs to the fixture. The com terminal on a light switch means that it is a three way or the kind of switch used where there are two or more switches that controll the same light or lights. The three way switch is a. Referring to this diagram above the common terminal goes to the red wire to the lamp in the left switch and the black wire on the right side switch.

The other wires for a three way are called the travelers and are the wires that connect the switches together.