Wire terminology

[BundyRoy]

When you get into the larger wire sizes is there any difference between 2 core/twin and earth and 3 core wires. The fact that they specify the earth made me think that maybe it was a smaller diameter or different from the other 2 in some way. Just wanted to check.

Thanks

 

[Skunberg]

In the US that would typically mean no insulation on the earth (ground) wire.

 

[Jago]

The earth can be smaller then the other conductors. (norm see this in larger 3&4 + earth, in the area 4-10mm)

However in a lot of the smaller twin & earth the earth is the same size. eg 1.5mm flex will be same size.

But why are you looking at mains cables. For the low voltage stick to automotive or speaker wire.