:) hi you all,I have a test coming up and have to build a 2way 2way lighting circuit with a 4 socket ring main.im after a detailed drawing to down load and keep.also I'm after the actual formula for calculating current carrying capacity of a cable.regards scandal

Since this is a test, you must have been given a lesson and study materials to be expected to pass the test.

It would be preferable that you show what you have learned and we can help from there with any questions.

You really don't expect someone to just hand over the answers and a prepared sketch, do you?