Old 2 Gang Light Switch Wiring

[Jtdyson]

Hi

I have this lighting socket but has no markings, does anyone have any idea what is L1,L2 and Com

Many thanks
J

 

[littlespark]

As with all two gang switches, it’s basically thought of as two switches on one plate.

From this near end, draw an imaginary line from between the red and black wires down to between the double red and blue.

Now on the left you have red and double red on a switch, and black yellow and blue on the other.

Normally when you look at the terminals of a switch as a triangle, the C or common is at the top or pointy end…. And L1, L2 are at the other.

Can we see the terminals of the new switch?
Different manufacturers label them differently… so you might have L1, L2, L3, and no Common… (the L1 being the common) and sometimes they throw in a “loop” terminal just to confuse us

 

[brianmoooore]

That's a Crabtree 2172. Common terminal is embossed in very small print on the white faceplate.