The TuttoNormel APP, available free of charge and exclusively to TuttoNormel subscribers, indicates in a simple and immediate way: . how the short circuit current away from the meter is reduced; . where 30 mA differentials are required; . how to choose the fire reaction class of CPR cables; . the color of the cables in new and old systems; . the capacity of the cables in the air; . the voltage drop for any circuit (verify % or maximum length); . the diameter of th