Pyörivien osien kokonaisinertian (tarvittaessa mukaan lukien simuloitu inertia) on oltava tunnettu ja ±20 kg:n sisällä testin inertialuokasta. ###>The total inertia of the rotating parts (including the simulated inertia where applicable) shall be known and shall be within ±20 kg of the inertia class for the test.