Routine, type and special tests, the ten cross-cutting procedures with their numeric criteria, and why the test sequence protects the evidence.

Traceability chains, approved against reference measuring systems, GUM uncertainty budgets, and the statistics behind U50, U10 and the 15/2 test.

Corona and the Peek criterion, contact resistance and hot spots, stray oscillation, field and harmonic distortion, ground loops and cable routing.