hi guys i spoke to nappit recently after reading their codebreakers book,it said code 2 for all cables which are buried in the wall less than 50mm deep not rcd protected.i then said when doing a eicr i have always coded lighting circuits not rcd protected as code 3, he then said you would have to around with a cable tracer to make sure all cables are within zones and unless you can prove that then it would be code 2,your thoughts guys