Hello I was jus wondering if anybody could help me...I would like to know how effective the insulation resistance test is. For example if you sliced the grey on your twin and earth and the insulation was damaged just slightly sheathed not to the copper would that be picked up in a Insulation resistance test ? Or does the Insulation have to be cut all the way to the copper for it to be picked up on the test. Also if the insulation was sheathed to copper at normal operating temperature 70 degrees what would happen to the cable?