The European Committee for Standardization (CEN) is the European organization responsible for developing and publishing technical standards. Here is a list of some of the EN (European Standard) codes and standards that are relevant to non-destructive testing (NDT):

1. EN 473: Non-destructive testing – Qualification and certification of NDT personnel
2. EN 583-1: Non-destructive testing – Ultrasonic testing – Part 1: General principles
3. EN 583-2: Non-destructive testing – Ultrasonic testing – Part 2: Pulse-echo technique
4. EN 583-3: Non-destructive testing – Ultrasonic testing – Part 3: Time-of-flight diffraction technique
5. EN 583-4: Non-destructive testing – Ultrasonic testing – Part 4: Techniques using through-transmission
6. EN 583-5: Non-destructive testing – Ultrasonic testing – Part 5: Pulse-echo technique using phased arrays
7. EN 583-6: Non-destructive testing – Ultrasonic testing – Part 6: Time-of-flight diffraction technique using phased arrays
8. EN 583-7: Non-destructive testing – Ultrasonic testing – Part 7: Guided wave testing
9. EN 584: Non-destructive testing – Leak testing
10. EN 588: Non-destructive testing – Liquid penetrant testing
11. EN 589: Non-destructive testing – Magnetic particle testing
12. EN 591: Non-destructive testing – Radiographic testing
13. EN 592: Non-destructive testing – Eddy current testing
14. EN 593: Non-destructive testing – Acoustic emission testing

These codes and standards provide guidance on the qualification, certification, and performance of NDT personnel, as well as the application and interpretation of various NDT methods, including ultrasonic, leak, penetrant, magnetic particle, radiographic, eddy current, and acoustic emission testing.